rtc: fix double lock on UIE emulation

[linux-2.6] / drivers / base / class.c

diff --git a/drivers/base/class.c b/drivers/base/class.c
index d24d21114ccbb175ee0c6d029897bb700f8018a8..5667c2f02c51b2249fdac0d69fc7fd0a8fe4dfd0 100644 (file)
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -18,6 +18,7 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/genhd.h>
+#include <linux/mutex.h>
 #include "base.h"
 
 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
@@ -134,7 +135,7 @@ 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;
@@ -147,7 +148,7 @@ int class_register(struct class *cls)
        INIT_LIST_HEAD(&cp->class_devices);
        INIT_LIST_HEAD(&cp->class_interfaces);
        kset_init(&cp->class_dirs);
-       init_MUTEX(&cp->class_sem);
+       __mutex_init(&cp->class_mutex, "struct class mutex", key);
        error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name);
        if (error) {
                kfree(cp);
@@ -178,6 +179,7 @@ int class_register(struct class *cls)
        class_put(cls);
        return error;
 }
+EXPORT_SYMBOL_GPL(__class_register);
 
 void class_unregister(struct class *cls)
 {
@@ -196,6 +198,7 @@ static void class_create_release(struct class *cls)
  * class_create - create a struct class structure
  * @owner: pointer to the module that is to "own" this struct class
  * @name: pointer to a string for the name of this class.
+ * @key: the lock_class_key for this class; used by mutex lock debugging
  *
  * This is used to create a struct class pointer that can then be used
  * in calls to device_create().
@@ -203,7 +206,8 @@ 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 +222,7 @@ 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 +232,7 @@ error:
        kfree(cls);
        return ERR_PTR(retval);
 }
+EXPORT_SYMBOL_GPL(__class_create);
 
 /**
  * class_destroy - destroys a struct class structure
@@ -278,7 +283,7 @@ char *make_class_name(const char *name, struct kobject *kobj)
  * We check the return of @fn each time. If it returns anything
  * other than 0, we break out and return that value.
  *
- * Note, we hold class->class_sem in this function, so it can not be
+ * Note, we hold class->class_mutex in this function, so it can not be
  * re-acquired in @fn, otherwise it will self-deadlocking. For
  * example, calls to add or remove class members would be verboten.
  */
@@ -290,7 +295,7 @@ int class_for_each_device(struct class *class, struct device *start,
 
        if (!class)
                return -EINVAL;
-       down(&class->p->class_sem);
+       mutex_lock(&class->p->class_mutex);
        list_for_each_entry(dev, &class->p->class_devices, node) {
                if (start) {
                        if (start == dev)
@@ -303,7 +308,7 @@ int class_for_each_device(struct class *class, struct device *start,
                if (error)
                        break;
        }
-       up(&class->p->class_sem);
+       mutex_unlock(&class->p->class_mutex);
 
        return error;
 }
@@ -326,7 +331,7 @@ EXPORT_SYMBOL_GPL(class_for_each_device);
  *
  * Note, you will need to drop the reference with put_device() after use.
  *
- * We hold class->class_sem in this function, so it can not be
+ * We hold class->class_mutex in this function, so it can not be
  * re-acquired in @match, otherwise it will self-deadlocking. For
  * example, calls to add or remove class members would be verboten.
  */
@@ -340,7 +345,7 @@ struct device *class_find_device(struct class *class, struct device *start,
        if (!class)
                return NULL;
 
-       down(&class->p->class_sem);
+       mutex_lock(&class->p->class_mutex);
        list_for_each_entry(dev, &class->p->class_devices, node) {
                if (start) {
                        if (start == dev)
@@ -354,7 +359,7 @@ struct device *class_find_device(struct class *class, struct device *start,
                } else
                        put_device(dev);
        }
-       up(&class->p->class_sem);
+       mutex_unlock(&class->p->class_mutex);
 
        return found ? dev : NULL;
 }
@@ -372,13 +377,13 @@ int class_interface_register(struct class_interface *class_intf)
        if (!parent)
                return -EINVAL;
 
-       down(&parent->p->class_sem);
+       mutex_lock(&parent->p->class_mutex);
        list_add_tail(&class_intf->node, &parent->p->class_interfaces);
        if (class_intf->add_dev) {
                list_for_each_entry(dev, &parent->p->class_devices, node)
                        class_intf->add_dev(dev, class_intf);
        }
-       up(&parent->p->class_sem);
+       mutex_unlock(&parent->p->class_mutex);
 
        return 0;
 }
@@ -391,13 +396,13 @@ void class_interface_unregister(struct class_interface *class_intf)
        if (!parent)
                return;
 
-       down(&parent->p->class_sem);
+       mutex_lock(&parent->p->class_mutex);
        list_del_init(&class_intf->node);
        if (class_intf->remove_dev) {
                list_for_each_entry(dev, &parent->p->class_devices, node)
                        class_intf->remove_dev(dev, class_intf);
        }
-       up(&parent->p->class_sem);
+       mutex_unlock(&parent->p->class_mutex);
 
        class_put(parent);
 }
@@ -412,9 +417,7 @@ 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);