![Jiri Kosina](/assets/img/avatar_default.png)
This reverts commit 8b37e1bef5
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It's broken as it changes led_blink_set() in a way that it can now sleep
(while synchronously waiting for workqueue to be cancelled). That's a
problem, because it's possible that this function gets called from atomic
context (tpt_trig_timer() takes a readlock and thus disables preemption).
This has been brought up 3 weeks ago already [1] but no proper fix has
materialized, and I keep seeing the problem since 3.17-rc1.
[1] https://lkml.org/lkml/2014/8/16/128
BUG: sleeping function called from invalid context at kernel/workqueue.c:2650
in_atomic(): 1, irqs_disabled(): 0, pid: 2335, name: wpa_supplicant
5 locks held by wpa_supplicant/2335:
#0: (rtnl_mutex){+.+.+.}, at: [<ffffffff814c7c92>] rtnl_lock+0x12/0x20
#1: (&wdev->mtx){+.+.+.}, at: [<ffffffffc06e649c>] cfg80211_mgd_wext_siwessid+0x5c/0x180 [cfg80211]
#2: (&local->mtx){+.+.+.}, at: [<ffffffffc0817dea>] ieee80211_prep_connection+0x17a/0x9a0 [mac80211]
#3: (&local->chanctx_mtx){+.+.+.}, at: [<ffffffffc08081ed>] ieee80211_vif_use_channel+0x5d/0x2a0 [mac80211]
#4: (&trig->leddev_list_lock){.+.+..}, at: [<ffffffffc081e68c>] tpt_trig_timer+0xec/0x170 [mac80211]
CPU: 0 PID: 2335 Comm: wpa_supplicant Not tainted 3.17.0-rc3 #1
Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
ffff8800360b5a50 ffff8800751f76d8 ffffffff8159e97f ffff8800360b5a30
ffff8800751f76e8 ffffffff810739a5 ffff8800751f77b0 ffffffff8106862f
ffffffff810685d0 0aa2209200000000 ffff880000000004 ffff8800361c59d0
Call Trace:
[<ffffffff8159e97f>] dump_stack+0x4d/0x66
[<ffffffff810739a5>] __might_sleep+0xe5/0x120
[<ffffffff8106862f>] flush_work+0x5f/0x270
[<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
[<ffffffff810945ca>] ? mark_held_locks+0x6a/0x90
[<ffffffff81068a5f>] ? __cancel_work_timer+0x6f/0x100
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
[<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
[<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
[<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
[<ffffffffc081ecdd>] ieee80211_mod_tpt_led_trig+0x9d/0x160 [mac80211]
[<ffffffffc07e4278>] __ieee80211_recalc_idle+0x98/0x140 [mac80211]
[<ffffffffc07e59ce>] ieee80211_idle_off+0xe/0x10 [mac80211]
[<ffffffffc0804e5b>] ieee80211_add_chanctx+0x3b/0x220 [mac80211]
[<ffffffffc08062e4>] ieee80211_new_chanctx+0x44/0xf0 [mac80211]
[<ffffffffc080838a>] ieee80211_vif_use_channel+0x1fa/0x2a0 [mac80211]
[<ffffffffc0817df8>] ieee80211_prep_connection+0x188/0x9a0 [mac80211]
[<ffffffffc081c246>] ieee80211_mgd_auth+0x256/0x2e0 [mac80211]
[<ffffffffc07eab33>] ieee80211_auth+0x13/0x20 [mac80211]
[<ffffffffc06cb006>] cfg80211_mlme_auth+0x106/0x270 [cfg80211]
[<ffffffffc06ce085>] cfg80211_conn_do_work+0x155/0x3b0 [cfg80211]
[<ffffffffc06cf670>] cfg80211_connect+0x3f0/0x540 [cfg80211]
[<ffffffffc06e6148>] cfg80211_mgd_wext_connect+0x158/0x1f0 [cfg80211]
[<ffffffffc06e651e>] cfg80211_mgd_wext_siwessid+0xde/0x180 [cfg80211]
[<ffffffffc06e36c0>] ? cfg80211_wext_giwessid+0x50/0x50 [cfg80211]
[<ffffffffc06e36dd>] cfg80211_wext_siwessid+0x1d/0x40 [cfg80211]
[<ffffffff81584d0c>] ioctl_standard_iw_point+0x14c/0x3e0
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff8158502a>] ioctl_standard_call+0x8a/0xd0
[<ffffffff81584fa0>] ? ioctl_standard_iw_point+0x3e0/0x3e0
[<ffffffff81584b76>] wireless_process_ioctl.constprop.10+0xb6/0x100
[<ffffffff8158521d>] wext_handle_ioctl+0x5d/0xb0
[<ffffffff814cfb29>] dev_ioctl+0x329/0x620
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff8149c7f2>] sock_ioctl+0x142/0x2e0
[<ffffffff811b0140>] do_vfs_ioctl+0x300/0x520
[<ffffffff815a67fb>] ? sysret_check+0x1b/0x56
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff811b03e1>] SyS_ioctl+0x81/0xa0
[<ffffffff815a67d6>] system_call_fastpath+0x1a/0x1f
wlan0: send auth to 00:0b:6b:3c:8c:e4 (try 1/3)
wlan0: authenticated
wlan0: associate with 00:0b:6b:3c:8c:e4 (try 1/3)
wlan0: RX AssocResp from 00:0b:6b:3c:8c:e4 (capab=0x431 status=0 aid=2)
wlan0: associated
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
cfg80211: Calling CRDA for country: NA
wlan0: Limiting TX power to 27 (27 - 0) dBm as advertised by 00:0b:6b:3c:8c:e4
=================================
[ INFO: inconsistent lock state ]
3.17.0-rc3 #1 Not tainted
---------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
((&(&led_cdev->blink_work)->work)){+.?...}, at: [<ffffffff810685d0>] flush_work+0x0/0x270
{SOFTIRQ-ON-W} state was registered at:
[<ffffffff81094dbe>] __lock_acquire+0x30e/0x1a30
[<ffffffff81096c81>] lock_acquire+0x91/0x110
[<ffffffff81068608>] flush_work+0x38/0x270
[<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
[<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
[<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
[<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
[<ffffffffc081ecdd>] ieee80211_mod_tpt_led_trig+0x9d/0x160 [mac80211]
[<ffffffffc07e4278>] __ieee80211_recalc_idle+0x98/0x140 [mac80211]
[<ffffffffc07e59ce>] ieee80211_idle_off+0xe/0x10 [mac80211]
[<ffffffffc0804e5b>] ieee80211_add_chanctx+0x3b/0x220 [mac80211]
[<ffffffffc08062e4>] ieee80211_new_chanctx+0x44/0xf0 [mac80211]
[<ffffffffc080838a>] ieee80211_vif_use_channel+0x1fa/0x2a0 [mac80211]
[<ffffffffc0817df8>] ieee80211_prep_connection+0x188/0x9a0 [mac80211]
[<ffffffffc081c246>] ieee80211_mgd_auth+0x256/0x2e0 [mac80211]
[<ffffffffc07eab33>] ieee80211_auth+0x13/0x20 [mac80211]
[<ffffffffc06cb006>] cfg80211_mlme_auth+0x106/0x270 [cfg80211]
[<ffffffffc06ce085>] cfg80211_conn_do_work+0x155/0x3b0 [cfg80211]
[<ffffffffc06cf670>] cfg80211_connect+0x3f0/0x540 [cfg80211]
[<ffffffffc06e6148>] cfg80211_mgd_wext_connect+0x158/0x1f0 [cfg80211]
[<ffffffffc06e651e>] cfg80211_mgd_wext_siwessid+0xde/0x180 [cfg80211]
[<ffffffffc06e36dd>] cfg80211_wext_siwessid+0x1d/0x40 [cfg80211]
[<ffffffff81584d0c>] ioctl_standard_iw_point+0x14c/0x3e0
[<ffffffff8158502a>] ioctl_standard_call+0x8a/0xd0
[<ffffffff81584b76>] wireless_process_ioctl.constprop.10+0xb6/0x100
[<ffffffff8158521d>] wext_handle_ioctl+0x5d/0xb0
[<ffffffff814cfb29>] dev_ioctl+0x329/0x620
[<ffffffff8149c7f2>] sock_ioctl+0x142/0x2e0
[<ffffffff811b0140>] do_vfs_ioctl+0x300/0x520
[<ffffffff811b03e1>] SyS_ioctl+0x81/0xa0
[<ffffffff815a67d6>] system_call_fastpath+0x1a/0x1f
irq event stamp: 493416
hardirqs last enabled at (493416): [<ffffffff81068a5f>] __cancel_work_timer+0x6f/0x100
hardirqs last disabled at (493415): [<ffffffff81067e9f>] try_to_grab_pending+0x1f/0x160
softirqs last enabled at (493408): [<ffffffff81053ced>] _local_bh_enable+0x1d/0x50
softirqs last disabled at (493409): [<ffffffff81054c75>] irq_exit+0xa5/0xb0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock((&(&led_cdev->blink_work)->work));
<Interrupt>
lock((&(&led_cdev->blink_work)->work));
*** DEADLOCK ***
2 locks held by swapper/0/0:
#0: (((&tpt_trig->timer))){+.-...}, at: [<ffffffff810b4c50>] call_timer_fn+0x0/0x180
#1: (&trig->leddev_list_lock){.+.?..}, at: [<ffffffffc081e68c>] tpt_trig_timer+0xec/0x170 [mac80211]
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.17.0-rc3 #1
Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
ffffffff8246eb30 ffff88007c203b00 ffffffff8159e97f ffffffff81a194c0
ffff88007c203b50 ffffffff81599c29 0000000000000001 ffffffff00000001
ffff880000000000 0000000000000006 ffffffff81a194c0 ffffffff81093ad0
Call Trace:
<IRQ> [<ffffffff8159e97f>] dump_stack+0x4d/0x66
[<ffffffff81599c29>] print_usage_bug+0x1f4/0x205
[<ffffffff81093ad0>] ? check_usage_backwards+0x140/0x140
[<ffffffff810944d3>] mark_lock+0x223/0x2b0
[<ffffffff81094d60>] __lock_acquire+0x2b0/0x1a30
[<ffffffff81096c81>] lock_acquire+0x91/0x110
[<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff81068608>] flush_work+0x38/0x270
[<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
[<ffffffff810945ca>] ? mark_held_locks+0x6a/0x90
[<ffffffff81068a5f>] ? __cancel_work_timer+0x6f/0x100
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff8109469d>] ? trace_hardirqs_on_caller+0xad/0x1c0
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
[<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
[<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
[<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
[<ffffffff810b4cc5>] call_timer_fn+0x75/0x180
[<ffffffff810b4c50>] ? process_timeout+0x10/0x10
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff810b50ac>] run_timer_softirq+0x1fc/0x2f0
[<ffffffff81054805>] __do_softirq+0x115/0x2e0
[<ffffffff81054c75>] irq_exit+0xa5/0xb0
[<ffffffff810049b3>] do_IRQ+0x53/0xf0
[<ffffffff815a74af>] common_interrupt+0x6f/0x6f
<EOI> [<ffffffff8147b56e>] ? cpuidle_enter_state+0x6e/0x180
[<ffffffff8147b732>] cpuidle_enter+0x12/0x20
[<ffffffff8108bba0>] cpu_startup_entry+0x330/0x360
[<ffffffff8158fb51>] rest_init+0xc1/0xd0
[<ffffffff8158fa90>] ? csum_partial_copy_generic+0x170/0x170
[<ffffffff81af3ff2>] start_kernel+0x44f/0x45a
[<ffffffff81af399c>] ? set_init_arg+0x53/0x53
[<ffffffff81af35ad>] x86_64_start_reservations+0x2a/0x2c
[<ffffffff81af36a0>] x86_64_start_kernel+0xf1/0xf4
Cc: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
291 lines
8.6 KiB
C
291 lines
8.6 KiB
C
/*
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* Driver model for leds and led triggers
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*
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* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
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* Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __LINUX_LEDS_H_INCLUDED
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#define __LINUX_LEDS_H_INCLUDED
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/rwsem.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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struct device;
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/*
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* LED Core
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*/
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enum led_brightness {
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LED_OFF = 0,
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LED_HALF = 127,
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LED_FULL = 255,
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};
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struct led_classdev {
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const char *name;
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int brightness;
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int max_brightness;
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int flags;
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/* Lower 16 bits reflect status */
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#define LED_SUSPENDED (1 << 0)
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/* Upper 16 bits reflect control information */
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#define LED_CORE_SUSPENDRESUME (1 << 16)
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#define LED_BLINK_ONESHOT (1 << 17)
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#define LED_BLINK_ONESHOT_STOP (1 << 18)
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#define LED_BLINK_INVERT (1 << 19)
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/* Set LED brightness level */
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/* Must not sleep, use a workqueue if needed */
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void (*brightness_set)(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/* Get LED brightness level */
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enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
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/*
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* Activate hardware accelerated blink, delays are in milliseconds
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* and if both are zero then a sensible default should be chosen.
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* The call should adjust the timings in that case and if it can't
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* match the values specified exactly.
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* Deactivate blinking again when the brightness is set to a fixed
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* value via the brightness_set() callback.
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*/
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int (*blink_set)(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off);
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struct device *dev;
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const struct attribute_group **groups;
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struct list_head node; /* LED Device list */
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const char *default_trigger; /* Trigger to use */
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unsigned long blink_delay_on, blink_delay_off;
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struct timer_list blink_timer;
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int blink_brightness;
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struct work_struct set_brightness_work;
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int delayed_set_value;
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#ifdef CONFIG_LEDS_TRIGGERS
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/* Protects the trigger data below */
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struct rw_semaphore trigger_lock;
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struct led_trigger *trigger;
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struct list_head trig_list;
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void *trigger_data;
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/* true if activated - deactivate routine uses it to do cleanup */
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bool activated;
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#endif
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};
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extern int led_classdev_register(struct device *parent,
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struct led_classdev *led_cdev);
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extern void led_classdev_unregister(struct led_classdev *led_cdev);
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extern void led_classdev_suspend(struct led_classdev *led_cdev);
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extern void led_classdev_resume(struct led_classdev *led_cdev);
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/**
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* led_blink_set - set blinking with software fallback
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* @led_cdev: the LED to start blinking
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* @delay_on: the time it should be on (in ms)
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* @delay_off: the time it should ble off (in ms)
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*
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* This function makes the LED blink, attempting to use the
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* hardware acceleration if possible, but falling back to
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* software blinking if there is no hardware blinking or if
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* the LED refuses the passed values.
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*
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* Note that if software blinking is active, simply calling
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* led_cdev->brightness_set() will not stop the blinking,
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* use led_classdev_brightness_set() instead.
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*/
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extern void led_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off);
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/**
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* led_blink_set_oneshot - do a oneshot software blink
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* @led_cdev: the LED to start blinking
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* @delay_on: the time it should be on (in ms)
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* @delay_off: the time it should ble off (in ms)
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* @invert: blink off, then on, leaving the led on
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*
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* This function makes the LED blink one time for delay_on +
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* delay_off time, ignoring the request if another one-shot
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* blink is already in progress.
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*
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* If invert is set, led blinks for delay_off first, then for
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* delay_on and leave the led on after the on-off cycle.
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*/
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extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off,
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int invert);
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/**
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* led_set_brightness - set LED brightness
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* @led_cdev: the LED to set
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* @brightness: the brightness to set it to
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*
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* Set an LED's brightness, and, if necessary, cancel the
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* software blink timer that implements blinking when the
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* hardware doesn't.
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*/
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extern void led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/*
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* LED Triggers
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*/
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/* Registration functions for simple triggers */
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#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
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#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
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#ifdef CONFIG_LEDS_TRIGGERS
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#define TRIG_NAME_MAX 50
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struct led_trigger {
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/* Trigger Properties */
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const char *name;
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void (*activate)(struct led_classdev *led_cdev);
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void (*deactivate)(struct led_classdev *led_cdev);
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/* LEDs under control by this trigger (for simple triggers) */
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rwlock_t leddev_list_lock;
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struct list_head led_cdevs;
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/* Link to next registered trigger */
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struct list_head next_trig;
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};
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/* Registration functions for complex triggers */
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extern int led_trigger_register(struct led_trigger *trigger);
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extern void led_trigger_unregister(struct led_trigger *trigger);
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extern void led_trigger_register_simple(const char *name,
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struct led_trigger **trigger);
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extern void led_trigger_unregister_simple(struct led_trigger *trigger);
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extern void led_trigger_event(struct led_trigger *trigger,
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enum led_brightness event);
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extern void led_trigger_blink(struct led_trigger *trigger,
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unsigned long *delay_on,
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unsigned long *delay_off);
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extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
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unsigned long *delay_on,
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unsigned long *delay_off,
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int invert);
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/**
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* led_trigger_rename_static - rename a trigger
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* @name: the new trigger name
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* @trig: the LED trigger to rename
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*
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* Change a LED trigger name by copying the string passed in
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* name into current trigger name, which MUST be large
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* enough for the new string.
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*
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* Note that name must NOT point to the same string used
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* during LED registration, as that could lead to races.
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*
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* This is meant to be used on triggers with statically
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* allocated name.
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*/
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extern void led_trigger_rename_static(const char *name,
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struct led_trigger *trig);
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#else
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/* Trigger has no members */
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struct led_trigger {};
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/* Trigger inline empty functions */
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static inline void led_trigger_register_simple(const char *name,
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struct led_trigger **trigger) {}
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static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
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static inline void led_trigger_event(struct led_trigger *trigger,
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enum led_brightness event) {}
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#endif /* CONFIG_LEDS_TRIGGERS */
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/* Trigger specific functions */
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#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
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extern void ledtrig_ide_activity(void);
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#else
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static inline void ledtrig_ide_activity(void) {}
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#endif
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#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
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extern void ledtrig_flash_ctrl(bool on);
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extern void ledtrig_torch_ctrl(bool on);
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#else
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static inline void ledtrig_flash_ctrl(bool on) {}
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static inline void ledtrig_torch_ctrl(bool on) {}
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#endif
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/*
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* Generic LED platform data for describing LED names and default triggers.
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*/
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struct led_info {
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const char *name;
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const char *default_trigger;
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int flags;
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};
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struct led_platform_data {
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int num_leds;
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struct led_info *leds;
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};
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/* For the leds-gpio driver */
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struct gpio_led {
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const char *name;
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const char *default_trigger;
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unsigned gpio;
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unsigned active_low : 1;
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unsigned retain_state_suspended : 1;
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unsigned default_state : 2;
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/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
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};
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#define LEDS_GPIO_DEFSTATE_OFF 0
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#define LEDS_GPIO_DEFSTATE_ON 1
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#define LEDS_GPIO_DEFSTATE_KEEP 2
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struct gpio_led_platform_data {
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int num_leds;
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const struct gpio_led *leds;
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#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
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#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
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#define GPIO_LED_BLINK 2 /* Please, blink */
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int (*gpio_blink_set)(unsigned gpio, int state,
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unsigned long *delay_on,
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unsigned long *delay_off);
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};
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struct platform_device *gpio_led_register_device(
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int id, const struct gpio_led_platform_data *pdata);
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enum cpu_led_event {
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CPU_LED_IDLE_START, /* CPU enters idle */
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CPU_LED_IDLE_END, /* CPU idle ends */
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CPU_LED_START, /* Machine starts, especially resume */
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CPU_LED_STOP, /* Machine stops, especially suspend */
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CPU_LED_HALTED, /* Machine shutdown */
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};
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#ifdef CONFIG_LEDS_TRIGGER_CPU
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extern void ledtrig_cpu(enum cpu_led_event evt);
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#else
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static inline void ledtrig_cpu(enum cpu_led_event evt)
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{
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return;
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}
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#endif
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#endif /* __LINUX_LEDS_H_INCLUDED */
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