From: Miklos Szeredi <mszeredi@suse.cz>
Date: Wed, 17 Apr 2013 19:50:58 +0000 (+0200)
Subject: fuse: optimize wake_up
X-Git-Tag: v3.12-rc1~875^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3c18ef8117f0515b1e455713dfc2e18b06db9bb5;p=kernel%2Fkernel-generic.git

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 3673105..be5c7e1 100644
--- 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 &&