linux-kernel - [PATCH 4.4 246/312] dm: fix second blk_delay_queue() parameter to be in msec units not jiffies

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Date:   Fri,  8 May 2020 14:33:57 +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 4.4 246/312] dm: fix second blk_delay_queue() parameter to be in msec units not jiffies

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")
Cc: stable@...r.kernel.org # 4.1+ -- stable@ backports must be applied to drivers/md/dm.c
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
@@ -2192,7 +2192,7 @@ static void dm_request_fn(struct request
 	goto out;
 
 delay_and_out:
-	blk_delay_queue(q, HZ / 100);
+	blk_delay_queue(q, 10);
 out:
 	dm_put_live_table(md, srcu_idx);
 }