sysfs: consolidate sysfs spinlocks
Replace sysfs_lock and kobj_sysfs_assoc_lock with sysfs_assoc_lock.
sysfs_lock was originally to be used to protect sysfs_dirent tree but
mutex seems better choice, so there is no reason to keep sysfs_lock
separate. Merge the two spinlocks into one.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 31b6cf3..1b56434 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -15,8 +15,7 @@
#include "sysfs.h"
DECLARE_RWSEM(sysfs_rename_sem);
-spinlock_t sysfs_lock = SPIN_LOCK_UNLOCKED;
-spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
+spinlock_t sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
static DEFINE_IDA(sysfs_ino_ida);
@@ -236,10 +235,10 @@
struct sysfs_dirent * sd = dentry->d_fsdata;
if (sd) {
- /* sd->s_dentry is protected with sysfs_lock. This
- * allows sysfs_drop_dentry() to dereference it.
+ /* sd->s_dentry is protected with sysfs_assoc_lock.
+ * This allows sysfs_drop_dentry() to dereference it.
*/
- spin_lock(&sysfs_lock);
+ spin_lock(&sysfs_assoc_lock);
/* The dentry might have been deleted or another
* lookup could have happened updating sd->s_dentry to
@@ -248,7 +247,7 @@
*/
if (sd->s_dentry == dentry)
sd->s_dentry = NULL;
- spin_unlock(&sysfs_lock);
+ spin_unlock(&sysfs_assoc_lock);
sysfs_put(sd);
}
iput(inode);
@@ -298,9 +297,9 @@
dentry->d_fsdata = sysfs_get(sd);
/* protect sd->s_dentry against sysfs_d_iput */
- spin_lock(&sysfs_lock);
+ spin_lock(&sysfs_assoc_lock);
sd->s_dentry = dentry;
- spin_unlock(&sysfs_lock);
+ spin_unlock(&sysfs_assoc_lock);
d_rehash(dentry);
}
@@ -603,9 +602,9 @@
{
struct sysfs_dirent *sd = kobj->sd;
- spin_lock(&kobj_sysfs_assoc_lock);
+ spin_lock(&sysfs_assoc_lock);
kobj->sd = NULL;
- spin_unlock(&kobj_sysfs_assoc_lock);
+ spin_unlock(&sysfs_assoc_lock);
__sysfs_remove_dir(sd);
}