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class: add lockdep infrastructure 

This adds the infrastructure to properly handle lockdep issues when the
internal class semaphore is changed to a mutex.

Matthew wrote the original patch, and Greg fixed it up to work properly
with the class_create() function.


From: Matthew Wilcox <matthew@wil.cx>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Dave Young <hidave.darkstar@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Wilcox 2008-05-28 09:28:39 -07:00 committed by Greg Kroah-Hartman
parent 1e41250863
commit d2a3b9146e
2 changed files with 29 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/base/class.c
View File

@ -134,7 +134,7 @@ static void remove_class_attrs(struct class *cls)
}
}
int class_register(struct class *cls)
int __class_register(struct class *cls, struct lock_class_key *key)
{
struct class_private *cp;
int error;
@ -178,6 +178,7 @@ int class_register(struct class *cls)
class_put(cls);
return error;
}
EXPORT_SYMBOL_GPL(__class_register);
void class_unregister(struct class *cls)
{
@ -203,7 +204,8 @@ static void class_create_release(struct class *cls)
* Note, the pointer created here is to be destroyed when finished by
* making a call to class_destroy().
*/
struct class *class_create(struct module *owner, const char *name)
struct class *__class_create(struct module *owner, const char *name,
struct lock_class_key *key)
{
struct class *cls;
int retval;
@ -218,7 +220,7 @@ struct class *class_create(struct module *owner, const char *name)
cls->owner = owner;
cls->class_release = class_create_release;
retval = class_register(cls);
retval = __class_register(cls, key);
if (retval)
goto error;
@ -228,6 +230,7 @@ error:
kfree(cls);
return ERR_PTR(retval);
}
EXPORT_SYMBOL_GPL(__class_create);
/**
* class_destroy - destroys a struct class structure
@ -412,9 +415,7 @@ int __init classes_init(void)
EXPORT_SYMBOL_GPL(class_create_file);
EXPORT_SYMBOL_GPL(class_remove_file);
EXPORT_SYMBOL_GPL(class_register);
EXPORT_SYMBOL_GPL(class_unregister);
EXPORT_SYMBOL_GPL(class_create);
EXPORT_SYMBOL_GPL(class_destroy);
EXPORT_SYMBOL_GPL(class_interface_register);

25
include/linux/device.h
View File

@ -16,6 +16,7 @@
#include <linux/kobject.h>
#include <linux/klist.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/module.h>
@ -205,8 +206,18 @@ struct class {
extern struct kobject *sysfs_dev_block_kobj;
extern struct kobject *sysfs_dev_char_kobj;
extern int __must_check class_register(struct class *class);
extern int __must_check __class_register(struct class *class,
struct lock_class_key *key);
extern void class_unregister(struct class *class);
/* This is a #define to keep the compiler from merging different
* instances of the __key variable */
#define class_register(class) \
({ \
static struct lock_class_key __key; \
__class_register(class, &__key); \
})
extern int class_for_each_device(struct class *class, struct device *start,
void *data,
int (*fn)(struct device *dev, void *data));
@ -239,9 +250,19 @@ struct class_interface {
extern int __must_check class_interface_register(struct class_interface *);
extern void class_interface_unregister(struct class_interface *);
extern struct class *class_create(struct module *owner, const char *name);
extern struct class * __must_check __class_create(struct module *owner,
const char *name,
struct lock_class_key *key);
extern void class_destroy(struct class *cls);
/* This is a #define to keep the compiler from merging different
* instances of the __key variable */
#define class_create(owner, name) \
({ \
static struct lock_class_key __key; \
__class_create(owner, name, &__key); \
})
/*
* The type of device, "struct device" is embedded in. A class
* or bus can contain devices of different types