linux-kernel - [PATCH 1/1] mm/backing-dev.c: Call del_timer_sync instead of del

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Date:	Thu,  1 Sep 2011 21:27:02 +0530
From:	Kautuk Consul <consul.kautuk@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jaxboe@...ionio.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Dave Chinner <dchinner@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Kautuk Consul <consul.kautuk@...il.com>
Subject: [PATCH 1/1] mm/backing-dev.c: Call del_timer_sync instead of del_timer

This is important for SMP scenario, to check whether the timer
callback is executing on another CPU when we are deleting the
timer.

Signed-off-by: Kautuk Consul <consul.kautuk@...il.com>
---
 mm/backing-dev.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index d6edf8d..754b35a 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -385,7 +385,7 @@ static int bdi_forker_thread(void *ptr)
 		 * dirty data on the default backing_dev_info
 		 */
 		if (wb_has_dirty_io(me) || !list_empty(&me->bdi->work_list)) {
-			del_timer(&me->wakeup_timer);
+			del_timer_sync(&me->wakeup_timer);
 			wb_do_writeback(me, 0);
 		}
 
-- 
1.7.4.1

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