![Kirill Smelkov](/assets/img/avatar_default.png)
Using scripts/coccinelle/api/stream_open.cocci added in10dce8af34
("fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock"), search and convert to stream_open all in-kernel nonseekable_open users for which read and write actually do not depend on ppos and where there is no other methods in file_operations which assume @offset access. I've verified each generated change manually - that it is correct to convert - and each other nonseekable_open instance left - that it is either not correct to convert there, or that it is not converted due to current stream_open.cocci limitations. The script also does not convert files that should be valid to convert, but that currently have .llseek = noop_llseek or generic_file_llseek for unknown reason despite file being opened with nonseekable_open (e.g. drivers/input/mousedev.c) Among cases converted 14 were potentially vulnerable to read vs write deadlock (see details in10dce8af34
): drivers/char/pcmcia/cm4000_cs.c:1685:7-23: ERROR: cm4000_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/gnss/core.c:45:1-17: ERROR: gnss_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/hid/uhid.c:635:1-17: ERROR: uhid_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/infiniband/core/user_mad.c:988:1-17: ERROR: umad_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/input/evdev.c:527:1-17: ERROR: evdev_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/input/misc/uinput.c:401:1-17: ERROR: uinput_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/isdn/capi/capi.c:963:8-24: ERROR: capi_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/leds/uleds.c:77:1-17: ERROR: uleds_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/media/rc/lirc_dev.c:198:1-17: ERROR: lirc_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/s390/char/fs3270.c:488:1-17: ERROR: fs3270_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/usb/misc/ldusb.c:310:1-17: ERROR: ld_usb_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/xen/evtchn.c:667:8-24: ERROR: evtchn_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. net/batman-adv/icmp_socket.c:80:1-17: ERROR: batadv_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. net/rfkill/core.c:1146:8-24: ERROR: rfkill_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. and the rest were just safe to convert to stream_open because their read and write do not use ppos at all and corresponding file_operations do not have methods that assume @offset file access(*): arch/powerpc/platforms/52xx/mpc52xx_gpt.c:631:8-24: WARNING: mpc52xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_ibox_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_ibox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_mbox_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_mbox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_wbox_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_wbox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/um/drivers/harddog_kern.c:88:8-24: WARNING: harddog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/x86/kernel/cpu/microcode/core.c:430:33-49: WARNING: microcode_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/ds1620.c:215:8-24: WARNING: ds1620_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/dtlk.c:301:1-17: WARNING: dtlk_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/ipmi/ipmi_watchdog.c:840:9-25: WARNING: ipmi_wdog_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/pcmcia/scr24x_cs.c:95:8-24: WARNING: scr24x_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/tb0219.c:246:9-25: WARNING: tb0219_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/firewire/nosy.c:306:8-24: WARNING: nosy_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/hwmon/fschmd.c:840:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/hwmon/w83793.c:1344:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/ucma.c:1747:8-24: WARNING: ucma_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/ucm.c:1178:8-24: WARNING: ucm_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/uverbs_main.c:1086:8-24: WARNING: uverbs_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/input/joydev.c:282:1-17: WARNING: joydev_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/pci/switch/switchtec.c:393:1-17: WARNING: switchtec_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/platform/chrome/cros_ec_debugfs.c:135:8-24: WARNING: cros_ec_console_log_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/rtc/rtc-ds1374.c:470:9-25: WARNING: ds1374_wdt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/rtc/rtc-m41t80.c:805:9-25: WARNING: wdt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/char/tape_char.c:293:2-18: WARNING: tape_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/char/zcore.c:194:8-24: WARNING: zcore_reipl_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/crypto/zcrypt_api.c:528:8-24: WARNING: zcrypt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/spi/spidev.c:594:1-17: WARNING: spidev_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/staging/pi433/pi433_if.c:974:1-17: WARNING: pi433_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/acquirewdt.c:203:8-24: WARNING: acq_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/advantechwdt.c:202:8-24: WARNING: advwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/alim1535_wdt.c:252:8-24: WARNING: ali_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/alim7101_wdt.c:217:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ar7_wdt.c:166:8-24: WARNING: ar7_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/at91rm9200_wdt.c:113:8-24: WARNING: at91wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ath79_wdt.c:135:8-24: WARNING: ath79_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/bcm63xx_wdt.c:119:8-24: WARNING: bcm63xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/cpu5wdt.c:143:8-24: WARNING: cpu5wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/cpwd.c:397:8-24: WARNING: cpwd_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/eurotechwdt.c:319:8-24: WARNING: eurwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/f71808e_wdt.c:528:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/gef_wdt.c:232:8-24: WARNING: gef_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/geodewdt.c:95:8-24: WARNING: geodewdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ib700wdt.c:241:8-24: WARNING: ibwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ibmasr.c:326:8-24: WARNING: asr_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/indydog.c:80:8-24: WARNING: indydog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/intel_scu_watchdog.c:307:8-24: WARNING: intel_scu_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/iop_wdt.c:104:8-24: WARNING: iop_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/it8712f_wdt.c:330:8-24: WARNING: it8712f_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ixp4xx_wdt.c:68:8-24: WARNING: ixp4xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ks8695_wdt.c:145:8-24: WARNING: ks8695wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/m54xx_wdt.c:88:8-24: WARNING: m54xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/machzwd.c:336:8-24: WARNING: zf_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mixcomwd.c:153:8-24: WARNING: mixcomwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mtx-1_wdt.c:121:8-24: WARNING: mtx1_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mv64x60_wdt.c:136:8-24: WARNING: mv64x60_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/nuc900_wdt.c:134:8-24: WARNING: nuc900wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/nv_tco.c:164:8-24: WARNING: nv_tco_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pc87413_wdt.c:289:8-24: WARNING: pc87413_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd.c:698:8-24: WARNING: pcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd.c:737:8-24: WARNING: pcwd_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_pci.c:581:8-24: WARNING: pcipcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_pci.c:623:8-24: WARNING: pcipcwd_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_usb.c:488:8-24: WARNING: usb_pcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_usb.c:527:8-24: WARNING: usb_pcwd_temperature_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pika_wdt.c:121:8-24: WARNING: pikawdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pnx833x_wdt.c:119:8-24: WARNING: pnx833x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/rc32434_wdt.c:153:8-24: WARNING: rc32434_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/rdc321x_wdt.c:145:8-24: WARNING: rdc321x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/riowd.c:79:1-17: WARNING: riowd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sa1100_wdt.c:62:8-24: WARNING: sa1100dog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc60xxwdt.c:211:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc7240_wdt.c:139:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc8360.c:274:8-24: WARNING: sbc8360_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc_epx_c3.c:81:8-24: WARNING: epx_c3_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc_fitpc2_wdt.c:78:8-24: WARNING: fitpc2_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sb_wdog.c:108:1-17: WARNING: sbwdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sc1200wdt.c:181:8-24: WARNING: sc1200wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sc520_wdt.c:261:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sch311x_wdt.c:319:8-24: WARNING: sch311x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/scx200_wdt.c:105:8-24: WARNING: scx200_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/smsc37b787_wdt.c:369:8-24: WARNING: wb_smsc_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/w83877f_wdt.c:227:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/w83977f_wdt.c:301:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wafer5823wdt.c:200:8-24: WARNING: wafwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/watchdog_dev.c:828:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdrtas.c:379:8-24: WARNING: wdrtas_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdrtas.c:445:8-24: WARNING: wdrtas_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt285.c:104:1-17: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt977.c:276:8-24: WARNING: wdt977_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt.c:424:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt.c:484:8-24: WARNING: wdt_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt_pci.c:464:8-24: WARNING: wdtpci_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt_pci.c:527:8-24: WARNING: wdtpci_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. net/batman-adv/log.c:105:1-17: WARNING: batadv_log_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. sound/core/control.c:57:7-23: WARNING: snd_ctl_f_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. sound/core/rawmidi.c:385:7-23: WARNING: snd_rawmidi_f_ops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. sound/core/seq/seq_clientmgr.c:310:7-23: WARNING: snd_seq_f_ops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. sound/core/timer.c:1428:7-23: WARNING: snd_timer_f_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. One can also recheck/review the patch via generating it with explanation comments included via $ make coccicheck MODE=patch COCCI=scripts/coccinelle/api/stream_open.cocci SPFLAGS="-D explain" (*) This second group also contains cases with read/write deadlocks that stream_open.cocci don't yet detect, but which are still valid to convert to stream_open since ppos is not used. For example drivers/pci/switch/switchtec.c calls wait_for_completion_interruptible() in its .read, but stream_open.cocci currently detects only "wait_event*" as blocking. Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yongzhi Pan <panyongzhi@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Juergen Gross <jgross@suse.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Tejun Heo <tj@kernel.org> Cc: Kirill Tkhai <ktkhai@virtuozzo.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Nikolaus Rath <Nikolaus@rath.org> Cc: Han-Wen Nienhuys <hanwen@google.com> Cc: Anatolij Gustschin <agust@denx.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James R. Van Zandt" <jrv@vanzandt.mv.com> Cc: Corey Minyard <minyard@acm.org> Cc: Harald Welte <laforge@gnumonks.org> Acked-by: Lubomir Rintel <lkundrak@v3.sk> [scr24x_cs] Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Johan Hovold <johan@kernel.org> Cc: David Herrmann <dh.herrmann@googlemail.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Jean Delvare <jdelvare@suse.com> Acked-by: Guenter Roeck <linux@roeck-us.net> [watchdog/* hwmon/*] Cc: Rudolf Marek <r.marek@assembler.cz> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com> Acked-by: Logan Gunthorpe <logang@deltatee.com> [drivers/pci/switch/switchtec] Acked-by: Bjorn Helgaas <bhelgaas@google.com> [drivers/pci/switch/switchtec] Cc: Benson Leung <bleung@chromium.org> Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> [platform/chrome] Cc: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> [rtc/*] Cc: Mark Brown <broonie@kernel.org> Cc: Wim Van Sebroeck <wim@linux-watchdog.org> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Zwane Mwaikambo <zwanem@gmail.com> Cc: Marek Lindner <mareklindner@neomailbox.ch> Cc: Simon Wunderlich <sw@simonwunderlich.de> Cc: Antonio Quartulli <a@unstable.cc> Cc: "David S. Miller" <davem@davemloft.net> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Signed-off-by: Kirill Smelkov <kirr@nexedi.com>
480 lines
11 KiB
C
480 lines
11 KiB
C
/*
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* National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver
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* (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com>,
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* All Rights Reserved.
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* Based on wdt.c and wdt977.c by Alan Cox and Woody Suwalski respectively.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* The author(s) of this software shall not be held liable for damages
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* of any nature resulting due to the use of this software. This
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* software is provided AS-IS with no warranties.
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*
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* Changelog:
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* 20020220 Zwane Mwaikambo Code based on datasheet, no hardware.
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* 20020221 Zwane Mwaikambo Cleanups as suggested by Jeff Garzik
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* and Alan Cox.
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* 20020222 Zwane Mwaikambo Added probing.
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* 20020225 Zwane Mwaikambo Added ISAPNP support.
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* 20020412 Rob Radez Broke out start/stop functions
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* <rob@osinvestor.com> Return proper status instead of
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* temperature warning
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* Add WDIOC_GETBOOTSTATUS and
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* WDIOC_SETOPTIONS ioctls
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* Fix CONFIG_WATCHDOG_NOWAYOUT
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* 20020530 Joel Becker Add Matt Domsch's nowayout module
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* option
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* 20030116 Adam Belay Updated to the latest pnp code
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/spinlock.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/pnp.h>
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#include <linux/fs.h>
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#include <linux/semaphore.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#define SC1200_MODULE_VER "build 20020303"
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#define SC1200_MODULE_NAME "sc1200wdt"
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#define MAX_TIMEOUT 255 /* 255 minutes */
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#define PMIR (io) /* Power Management Index Register */
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#define PMDR (io+1) /* Power Management Data Register */
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/* Data Register indexes */
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#define FER1 0x00 /* Function enable register 1 */
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#define FER2 0x01 /* Function enable register 2 */
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#define PMC1 0x02 /* Power Management Ctrl 1 */
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#define PMC2 0x03 /* Power Management Ctrl 2 */
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#define PMC3 0x04 /* Power Management Ctrl 3 */
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#define WDTO 0x05 /* Watchdog timeout register */
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#define WDCF 0x06 /* Watchdog config register */
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#define WDST 0x07 /* Watchdog status register */
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/* WDCF bitfields - which devices assert WDO */
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#define KBC_IRQ 0x01 /* Keyboard Controller */
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#define MSE_IRQ 0x02 /* Mouse */
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#define UART1_IRQ 0x03 /* Serial0 */
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#define UART2_IRQ 0x04 /* Serial1 */
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/* 5 -7 are reserved */
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static int timeout = 1;
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static int io = -1;
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static int io_len = 2; /* for non plug and play */
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static unsigned long open_flag;
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static char expect_close;
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static DEFINE_SPINLOCK(sc1200wdt_lock); /* io port access serialisation */
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#if defined CONFIG_PNP
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static int isapnp = 1;
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static struct pnp_dev *wdt_dev;
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module_param(isapnp, int, 0);
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MODULE_PARM_DESC(isapnp,
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"When set to 0 driver ISA PnP support will be disabled");
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#endif
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module_param_hw(io, int, ioport, 0);
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MODULE_PARM_DESC(io, "io port");
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout, "range is 0-255 minutes, default is 1");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/* Read from Data Register */
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static inline void __sc1200wdt_read_data(unsigned char index,
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unsigned char *data)
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{
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outb_p(index, PMIR);
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*data = inb(PMDR);
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}
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static void sc1200wdt_read_data(unsigned char index, unsigned char *data)
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{
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spin_lock(&sc1200wdt_lock);
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__sc1200wdt_read_data(index, data);
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spin_unlock(&sc1200wdt_lock);
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}
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/* Write to Data Register */
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static inline void __sc1200wdt_write_data(unsigned char index,
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unsigned char data)
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{
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outb_p(index, PMIR);
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outb(data, PMDR);
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}
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static inline void sc1200wdt_write_data(unsigned char index,
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unsigned char data)
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{
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spin_lock(&sc1200wdt_lock);
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__sc1200wdt_write_data(index, data);
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spin_unlock(&sc1200wdt_lock);
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}
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static void sc1200wdt_start(void)
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{
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unsigned char reg;
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spin_lock(&sc1200wdt_lock);
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__sc1200wdt_read_data(WDCF, ®);
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/* assert WDO when any of the following interrupts are triggered too */
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reg |= (KBC_IRQ | MSE_IRQ | UART1_IRQ | UART2_IRQ);
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__sc1200wdt_write_data(WDCF, reg);
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/* set the timeout and get the ball rolling */
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__sc1200wdt_write_data(WDTO, timeout);
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spin_unlock(&sc1200wdt_lock);
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}
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static void sc1200wdt_stop(void)
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{
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sc1200wdt_write_data(WDTO, 0);
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}
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/* This returns the status of the WDO signal, inactive high. */
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static inline int sc1200wdt_status(void)
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{
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unsigned char ret;
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sc1200wdt_read_data(WDST, &ret);
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/* If the bit is inactive, the watchdog is enabled, so return
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* KEEPALIVEPING which is a bit of a kludge because there's nothing
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* else for enabled/disabled status
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*/
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return (ret & 0x01) ? 0 : WDIOF_KEEPALIVEPING;
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}
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static int sc1200wdt_open(struct inode *inode, struct file *file)
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{
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/* allow one at a time */
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if (test_and_set_bit(0, &open_flag))
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return -EBUSY;
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if (timeout > MAX_TIMEOUT)
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timeout = MAX_TIMEOUT;
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sc1200wdt_start();
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pr_info("Watchdog enabled, timeout = %d min(s)", timeout);
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return stream_open(inode, file);
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}
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static long sc1200wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int new_timeout;
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static const struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE,
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.firmware_version = 0,
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.identity = "PC87307/PC97307",
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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return 0;
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case WDIOC_GETSTATUS:
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return put_user(sc1200wdt_status(), p);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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{
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int options, retval = -EINVAL;
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if (get_user(options, p))
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return -EFAULT;
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if (options & WDIOS_DISABLECARD) {
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sc1200wdt_stop();
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retval = 0;
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}
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if (options & WDIOS_ENABLECARD) {
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sc1200wdt_start();
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retval = 0;
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}
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return retval;
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}
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case WDIOC_KEEPALIVE:
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sc1200wdt_write_data(WDTO, timeout);
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_timeout, p))
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return -EFAULT;
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/* the API states this is given in secs */
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new_timeout /= 60;
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if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
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return -EINVAL;
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timeout = new_timeout;
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sc1200wdt_write_data(WDTO, timeout);
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/* fall through - and return the new timeout */
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case WDIOC_GETTIMEOUT:
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return put_user(timeout * 60, p);
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default:
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return -ENOTTY;
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}
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}
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static int sc1200wdt_release(struct inode *inode, struct file *file)
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{
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if (expect_close == 42) {
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sc1200wdt_stop();
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pr_info("Watchdog disabled\n");
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} else {
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sc1200wdt_write_data(WDTO, timeout);
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pr_crit("Unexpected close!, timeout = %d min(s)\n", timeout);
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}
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clear_bit(0, &open_flag);
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expect_close = 0;
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return 0;
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}
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static ssize_t sc1200wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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expect_close = 0;
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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sc1200wdt_write_data(WDTO, timeout);
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return len;
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}
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return 0;
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}
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static int sc1200wdt_notify_sys(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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sc1200wdt_stop();
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return NOTIFY_DONE;
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}
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static struct notifier_block sc1200wdt_notifier = {
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.notifier_call = sc1200wdt_notify_sys,
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};
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static const struct file_operations sc1200wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = sc1200wdt_write,
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.unlocked_ioctl = sc1200wdt_ioctl,
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.open = sc1200wdt_open,
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.release = sc1200wdt_release,
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};
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static struct miscdevice sc1200wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &sc1200wdt_fops,
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};
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static int __init sc1200wdt_probe(void)
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{
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/* The probe works by reading the PMC3 register's default value of 0x0e
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* there is one caveat, if the device disables the parallel port or any
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* of the UARTs we won't be able to detect it.
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* NB. This could be done with accuracy by reading the SID registers,
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* but we don't have access to those io regions.
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*/
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unsigned char reg;
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sc1200wdt_read_data(PMC3, ®);
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reg &= 0x0f; /* we don't want the UART busy bits */
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return (reg == 0x0e) ? 0 : -ENODEV;
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}
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#if defined CONFIG_PNP
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static const struct pnp_device_id scl200wdt_pnp_devices[] = {
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/* National Semiconductor PC87307/PC97307 watchdog component */
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{.id = "NSC0800", .driver_data = 0},
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{.id = ""},
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};
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static int scl200wdt_pnp_probe(struct pnp_dev *dev,
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const struct pnp_device_id *dev_id)
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{
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/* this driver only supports one card at a time */
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if (wdt_dev || !isapnp)
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return -EBUSY;
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wdt_dev = dev;
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io = pnp_port_start(wdt_dev, 0);
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io_len = pnp_port_len(wdt_dev, 0);
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if (!request_region(io, io_len, SC1200_MODULE_NAME)) {
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pr_err("Unable to register IO port %#x\n", io);
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return -EBUSY;
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}
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pr_info("PnP device found at io port %#x/%d\n", io, io_len);
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return 0;
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}
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static void scl200wdt_pnp_remove(struct pnp_dev *dev)
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{
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if (wdt_dev) {
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release_region(io, io_len);
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wdt_dev = NULL;
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}
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}
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static struct pnp_driver scl200wdt_pnp_driver = {
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.name = "scl200wdt",
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.id_table = scl200wdt_pnp_devices,
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.probe = scl200wdt_pnp_probe,
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.remove = scl200wdt_pnp_remove,
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};
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#endif /* CONFIG_PNP */
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static int __init sc1200wdt_init(void)
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{
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int ret;
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pr_info("%s\n", SC1200_MODULE_VER);
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#if defined CONFIG_PNP
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if (isapnp) {
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ret = pnp_register_driver(&scl200wdt_pnp_driver);
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if (ret)
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goto out_clean;
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}
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#endif
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if (io == -1) {
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pr_err("io parameter must be specified\n");
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ret = -EINVAL;
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goto out_pnp;
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}
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#if defined CONFIG_PNP
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/* now that the user has specified an IO port and we haven't detected
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* any devices, disable pnp support */
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if (isapnp)
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pnp_unregister_driver(&scl200wdt_pnp_driver);
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isapnp = 0;
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#endif
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if (!request_region(io, io_len, SC1200_MODULE_NAME)) {
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pr_err("Unable to register IO port %#x\n", io);
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ret = -EBUSY;
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goto out_pnp;
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}
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ret = sc1200wdt_probe();
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if (ret)
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goto out_io;
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ret = register_reboot_notifier(&sc1200wdt_notifier);
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if (ret) {
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pr_err("Unable to register reboot notifier err = %d\n", ret);
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goto out_io;
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}
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ret = misc_register(&sc1200wdt_miscdev);
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if (ret) {
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pr_err("Unable to register miscdev on minor %d\n",
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WATCHDOG_MINOR);
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goto out_rbt;
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}
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/* ret = 0 */
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out_clean:
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return ret;
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out_rbt:
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unregister_reboot_notifier(&sc1200wdt_notifier);
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out_io:
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release_region(io, io_len);
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out_pnp:
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#if defined CONFIG_PNP
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if (isapnp)
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pnp_unregister_driver(&scl200wdt_pnp_driver);
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#endif
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goto out_clean;
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}
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static void __exit sc1200wdt_exit(void)
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{
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misc_deregister(&sc1200wdt_miscdev);
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unregister_reboot_notifier(&sc1200wdt_notifier);
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#if defined CONFIG_PNP
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if (isapnp)
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pnp_unregister_driver(&scl200wdt_pnp_driver);
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else
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#endif
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release_region(io, io_len);
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}
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module_init(sc1200wdt_init);
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module_exit(sc1200wdt_exit);
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MODULE_AUTHOR("Zwane Mwaikambo <zwane@commfireservices.com>");
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MODULE_DESCRIPTION(
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"Driver for National Semiconductor PC87307/PC97307 watchdog component");
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MODULE_LICENSE("GPL");
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