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>
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/**
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* System devices follow a slightly different driver model.
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* They don't need to do dynammic driver binding, can't be probed,
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* and don't reside on any type of peripheral bus.
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* So, we represent and treat them a little differently.
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*
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* We still have a notion of a driver for a system device, because we still
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* want to perform basic operations on these devices.
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*
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* We also support auxillary drivers binding to devices of a certain class.
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*
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* This allows configurable drivers to register themselves for devices of
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* a certain type. And, it allows class definitions to reside in generic
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* code while arch-specific code can register specific drivers.
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*
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* Auxillary drivers registered with a NULL cls are registered as drivers
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* for all system devices, and get notification calls for each device.
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*/
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#ifndef _SYSDEV_H_
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#define _SYSDEV_H_
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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struct sys_device;
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struct sysdev_class {
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struct list_head drivers;
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/* Default operations for these types of devices */
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int (*shutdown)(struct sys_device *);
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int (*suspend)(struct sys_device *, pm_message_t state);
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int (*resume)(struct sys_device *);
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struct kset kset;
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};
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struct sysdev_class_attribute {
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struct attribute attr;
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ssize_t (*show)(struct sysdev_class *, char *);
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ssize_t (*store)(struct sysdev_class *, const char *, size_t);
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};
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#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
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struct sysdev_class_attribute attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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};
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extern int sysdev_class_register(struct sysdev_class *);
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extern void sysdev_class_unregister(struct sysdev_class *);
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extern int sysdev_class_create_file(struct sysdev_class *,
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struct sysdev_class_attribute *);
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extern void sysdev_class_remove_file(struct sysdev_class *,
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struct sysdev_class_attribute *);
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/**
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* Auxillary system device drivers.
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*/
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struct sysdev_driver {
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struct list_head entry;
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int (*add)(struct sys_device *);
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int (*remove)(struct sys_device *);
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int (*shutdown)(struct sys_device *);
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int (*suspend)(struct sys_device *, pm_message_t state);
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int (*resume)(struct sys_device *);
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};
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extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
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extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
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/**
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* sys_devices can be simplified a lot from regular devices, because they're
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* simply not as versatile.
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*/
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struct sys_device {
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u32 id;
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struct sysdev_class * cls;
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struct kobject kobj;
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};
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extern int sysdev_register(struct sys_device *);
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extern void sysdev_unregister(struct sys_device *);
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struct sysdev_attribute {
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struct attribute attr;
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ssize_t (*show)(struct sys_device *, char *);
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ssize_t (*store)(struct sys_device *, const char *, size_t);
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};
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#define _SYSDEV_ATTR(_name,_mode,_show,_store) \
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{ \
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.attr = { .name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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}
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#define SYSDEV_ATTR(_name,_mode,_show,_store) \
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struct sysdev_attribute attr_##_name = _SYSDEV_ATTR(_name,_mode,_show,_store);
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extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
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extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
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#endif /* _SYSDEV_H_ */
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