fuse: optimize wake_up

Normally blocked_waitq will be inactive, so optimize this case.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 3673105889628714a4f5c02fcfa73f0301ba3320..be5c7e13320c8007ee3d0f7d221c07a886eb52f9 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -379,7 +379,7 @@ __releases(fc->lock)
                        fc->blocked = 0;
 
                /* Wake up next waiter, if any */
-               if (!fc->blocked)
+               if (!fc->blocked && waitqueue_active(&fc->blocked_waitq))
                        wake_up(&fc->blocked_waitq);
 
                if (fc->num_background == fc->congestion_threshold &&