sysfs: Introduce sysfs_rename_mutex

[pandora-kernel.git] / fs / sysfs / dir.c

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 1af963e..9fe83d2 100644 (file)
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -15,6 +15,7 @@
 #include "sysfs.h"
 
 DEFINE_MUTEX(sysfs_mutex);
+DEFINE_MUTEX(sysfs_rename_mutex);
 spinlock_t sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
 
 static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
@@ -82,7 +83,7 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
  *     down from there looking up dentry for each step.
  *
  *     LOCKING:
- *     Kernel thread context (may sleep)
+ *     mutex_lock(sysfs_rename_mutex)
  *
  *     RETURNS:
  *     Pointer to found dentry on success, ERR_PTR() value on error.
@@ -858,6 +859,8 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
        const char *dup_name = NULL;
        int error;
 
+       mutex_lock(&sysfs_rename_mutex);
+
        /* get the original dentry */
        sd = kobj->sd;
        old_dentry = sysfs_get_dentry(sd);
@@ -915,6 +918,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
        kfree(dup_name);
        dput(old_dentry);
        dput(new_dentry);
+       mutex_unlock(&sysfs_rename_mutex);
        return error;
 }
 
@@ -926,6 +930,7 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
        struct dentry *old_dentry = NULL, *new_dentry = NULL;
        int error;
 
+       mutex_lock(&sysfs_rename_mutex);
        BUG_ON(!sd->s_parent);
        new_parent_sd = new_parent_kobj->sd ? new_parent_kobj->sd : &sysfs_root;
 
@@ -982,6 +987,7 @@ again:
        dput(new_parent);
        dput(old_dentry);
        dput(new_dentry);
+       mutex_unlock(&sysfs_rename_mutex);
        return error;
 }