[PATCH] dm: rwlock_t -> rw_semaphore (fluff)

Use a rw_semaphore in dm_target.c rather than a rwlock_t, just to keep
in line with dm.c

diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 4fb36b866f3d61e2de8112429783098118b3929f..699b0f4d72df2389f6161cc3e1f286bcd27c04c6 100644 (file)
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -19,7 +19,7 @@ struct tt_internal {
 };
 
 static LIST_HEAD(_targets);
-static rwlock_t _lock = RW_LOCK_UNLOCKED;
+static DECLARE_RWSEM(_lock);
 
 #define DM_MOD_NAME_SIZE 32
 
@@ -42,7 +42,7 @@ static struct tt_internal *get_target_type(const char *name)
 {
        struct tt_internal *ti;
 
-       read_lock(&_lock);
+       down_read(&_lock);
 
        ti = __find_target_type(name);
        if (ti) {
@@ -52,7 +52,7 @@ static struct tt_internal *get_target_type(const char *name)
                        ti->use++;
        }
 
-       read_unlock(&_lock);
+       up_read(&_lock);
        return ti;
 }
 
@@ -86,13 +86,13 @@ void dm_put_target_type(struct target_type *t)
 {
        struct tt_internal *ti = (struct tt_internal *) t;
 
-       read_lock(&_lock);
+       down_read(&_lock);
        if (--ti->use == 0)
                module_put(ti->tt.module);
 
        if (ti->use < 0)
                BUG();
-       read_unlock(&_lock);
+       up_read(&_lock);
 
        return;
 }
@@ -117,13 +117,13 @@ int dm_register_target(struct target_type *t)
        if (!ti)
                return -ENOMEM;
 
-       write_lock(&_lock);
+       down_write(&_lock);
        if (__find_target_type(t->name))
                rv = -EEXIST;
        else
                list_add(&ti->list, &_targets);
 
-       write_unlock(&_lock);
+       up_write(&_lock);
        return rv;
 }
 
@@ -131,21 +131,21 @@ int dm_unregister_target(struct target_type *t)
 {
        struct tt_internal *ti;
 
-       write_lock(&_lock);
+       down_write(&_lock);
        if (!(ti = __find_target_type(t->name))) {
-               write_unlock(&_lock);
+               up_write(&_lock);
                return -EINVAL;
        }
 
        if (ti->use) {
-               write_unlock(&_lock);
+               up_write(&_lock);
                return -ETXTBSY;
        }
 
        list_del(&ti->list);
        kfree(ti);
 
-       write_unlock(&_lock);
+       up_write(&_lock);
        return 0;
 }