7b595756ec
sysfs is now completely out of driver/module lifetime game. After deletion, a sysfs node doesn't access anything outside sysfs proper, so there's no reason to hold onto the attribute owners. Note that often the wrong modules were accounted for as owners leading to accessing removed modules. This patch kills now unnecessary attribute->owner. Note that with this change, userland holding a sysfs node does not prevent the backing module from being unloaded. For more info regarding lifetime rule cleanup, please read the following message. http://article.gmane.org/gmane.linux.kernel/510293 (tweaked by Greg to not delete the field just yet, to make it easier to merge things properly.) Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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* File Attributes for Zorro Devices
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*
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* Copyright (C) 2003 Geert Uytterhoeven
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*
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* Loosely based on drivers/pci/pci-sysfs.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/zorro.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include "zorro.h"
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/* show configuration fields */
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#define zorro_config_attr(name, field, format_string) \
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static ssize_t \
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show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct zorro_dev *z; \
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\
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z = to_zorro_dev(dev); \
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return sprintf(buf, format_string, z->field); \
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} \
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static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
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zorro_config_attr(id, id, "0x%08x\n");
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zorro_config_attr(type, rom.er_Type, "0x%02x\n");
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zorro_config_attr(serial, rom.er_SerialNumber, "0x%08x\n");
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zorro_config_attr(slotaddr, slotaddr, "0x%04x\n");
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zorro_config_attr(slotsize, slotsize, "0x%04x\n");
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static ssize_t zorro_show_resource(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct zorro_dev *z = to_zorro_dev(dev);
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return sprintf(buf, "0x%08lx 0x%08lx 0x%08lx\n",
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(unsigned long)zorro_resource_start(z),
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(unsigned long)zorro_resource_end(z),
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zorro_resource_flags(z));
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}
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static DEVICE_ATTR(resource, S_IRUGO, zorro_show_resource, NULL);
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static ssize_t zorro_read_config(struct kobject *kobj, char *buf, loff_t off,
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size_t count)
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{
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struct zorro_dev *z = to_zorro_dev(container_of(kobj, struct device,
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kobj));
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struct ConfigDev cd;
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unsigned int size = sizeof(cd);
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if (off > size)
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return 0;
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if (off+count > size)
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count = size-off;
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/* Construct a ConfigDev */
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memset(&cd, 0, sizeof(cd));
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cd.cd_Rom = z->rom;
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cd.cd_SlotAddr = z->slotaddr;
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cd.cd_SlotSize = z->slotsize;
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cd.cd_BoardAddr = (void *)zorro_resource_start(z);
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cd.cd_BoardSize = zorro_resource_len(z);
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memcpy(buf, (void *)&cd+off, count);
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return count;
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}
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static struct bin_attribute zorro_config_attr = {
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.attr = {
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.name = "config",
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.mode = S_IRUGO | S_IWUSR,
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},
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.size = sizeof(struct ConfigDev),
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.read = zorro_read_config,
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};
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void zorro_create_sysfs_dev_files(struct zorro_dev *z)
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{
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struct device *dev = &z->dev;
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/* current configuration's attributes */
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device_create_file(dev, &dev_attr_id);
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device_create_file(dev, &dev_attr_type);
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device_create_file(dev, &dev_attr_serial);
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device_create_file(dev, &dev_attr_slotaddr);
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device_create_file(dev, &dev_attr_slotsize);
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device_create_file(dev, &dev_attr_resource);
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sysfs_create_bin_file(&dev->kobj, &zorro_config_attr);
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}
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