block: serialize all debugfs operations using q->debugfs_mutex

[linux-2.6-microblaze.git] / kernel / trace / blktrace.c

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 10a32b0..fe04c6f 100644 (file)
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -770,14 +770,11 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
  **/
 void blk_trace_shutdown(struct request_queue *q)
 {
-       mutex_lock(&q->debugfs_mutex);
        if (rcu_dereference_protected(q->blk_trace,
                                      lockdep_is_held(&q->debugfs_mutex))) {
                __blk_trace_startstop(q, 0);
                __blk_trace_remove(q);
        }
-
-       mutex_unlock(&q->debugfs_mutex);
 }
 
 #ifdef CONFIG_BLK_CGROUP