linux-kernel - [PATCH 3.19.y-ckt 021/102] xen-blkback: replace work_pending with work_busy in purge_persistent

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Message-Id: <1442944358-1248-22-git-send-email-kamal@canonical.com>
Date:	Tue, 22 Sep 2015 10:51:17 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Bob Liu <bob.liu@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 021/102] xen-blkback: replace work_pending with work_busy in purge_persistent_gnt()

3.19.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

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

From: Bob Liu <bob.liu@...cle.com>

commit 53bc7dc004fecf39e0ba70f2f8d120a1444315d3 upstream.

The BUG_ON() in purge_persistent_gnt() will be triggered when previous purge
work haven't finished.

There is a work_pending() before this BUG_ON, but it doesn't account if the work
is still currently running.

Acked-by: Roger Pau Monné <roger.pau@...rix.com>
Signed-off-by: Bob Liu <bob.liu@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
[ kamal: backport to 3.19-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/block/xen-blkback/blkback.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 63fc7f0..02004e1 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -350,8 +350,8 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)
 		return;
 	}
 
-	if (work_pending(&blkif->persistent_purge_work)) {
-		pr_alert_ratelimited(DRV_PFX "Scheduled work from previous purge is still pending, cannot purge list\n");
+	if (work_busy(&blkif->persistent_purge_work)) {
+		pr_alert_ratelimited(DRV_PFX "Scheduled work from previous purge is still busy, cannot purge list\n");
 		return;
 	}
 
-- 
1.9.1

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