linux-kernel - [PATCH 4.7 050/186] dm: fix second blk_delay_queue() parameter to be in msec units not jiffies

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Message-Id: <20160818135934.301905731@linuxfoundation.org>
Date:	Thu, 18 Aug 2016 15:57:47 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tahsin Erdogan <tahsin@...gle.com>,
	Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.7 050/186] dm: fix second blk_delay_queue() parameter to be in msec units not jiffies

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tahsin Erdogan <tahsin@...gle.com>

commit bd9f55ea1cf6e14eb054b06ea877d2d1fa339514 upstream.

Commit d548b34b062 ("dm: reduce the queue delay used in dm_request_fn
from 100ms to 10ms") always intended the value to be 10 msecs -- it
just expressed it in jiffies because earlier commit 7eaceaccab ("block:
remove per-queue plugging") did.

Signed-off-by: Tahsin Erdogan <tahsin@...gle.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Fixes: d548b34b062 ("dm: reduce the queue delay used in dm_request_fn from 100ms to 10ms")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2175,7 +2175,7 @@ static void dm_request_fn(struct request
 		     md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 &&
 		     md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
 		    (ti->type->busy && ti->type->busy(ti))) {
-			blk_delay_queue(q, HZ / 100);
+			blk_delay_queue(q, 10);
 			return;
 		}