linux-kernel - [PATCH 1/2] cfq_exit_queue() should cancel cfq_data->unplug

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Message-ID: <20071020122015.GA2487@tv-sign.ru>
Date:	Sat, 20 Oct 2007 16:20:15 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>
Cc:	Nick <gentuu@...il.com>, Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] cfq_exit_queue() should cancel cfq_data->unplug_work

(untested, needs an explicit ack/nack from maintainer)

Spotted by Nick <gentuu@...il.com>, perhaps explains the first trace in
http://bugzilla.kernel.org/show_bug.cgi?id=9180.

cfq_exit_queue() should cancel cfqd->unplug_work before freeing cfqd.
blk_sync_queue() seems unneeded, removed.

Q: why cfq_exit_queue() calls cfq_shutdown_timer_wq() twice?

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- K/block/cfq-iosched.c~1_cfq	2007-08-09 19:59:26.000000000 +0400
+++ K/block/cfq-iosched.c	2007-10-20 15:48:35.000000000 +0400
@@ -2053,7 +2053,7 @@ static void cfq_shutdown_timer_wq(struct
 {
 	del_timer_sync(&cfqd->idle_slice_timer);
 	del_timer_sync(&cfqd->idle_class_timer);
-	blk_sync_queue(cfqd->queue);
+	kblockd_flush_work(&cfqd->unplug_work);
 }
 
 static void cfq_put_async_queues(struct cfq_data *cfqd)

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