From: Kent Overstreet <kmo@daterainc.com>
Date: Tue, 24 Sep 2013 06:17:33 +0000 (-0700)
Subject: bcache: Fix a dumb CPU spinning bug in writeback
X-Git-Tag: firefly_0821_release~6453^2~694
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ff1a51b9bf5808f2d40b8e605ff7f7cdc7973b3e;p=firefly-linux-kernel-4.4.55.git

bcache: Fix a dumb CPU spinning bug in writeback

commit 79e3dab90d9f826ceca67c7890e048ac9169de49 upstream.

schedule_timeout() != schedule_timeout_uninterruptible()

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 12c0cd135ef8..841f0490d4ef 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -327,8 +327,7 @@ static void read_dirty(struct closure *cl)
 		if (delay > 0 &&
 		    (KEY_START(&w->key) != dc->last_read ||
 		     jiffies_to_msecs(delay) > 50))
-			while (delay)
-				delay = schedule_timeout(delay);
+			delay = schedule_timeout_uninterruptible(delay);
 
 		dc->last_read	= KEY_OFFSET(&w->key);