[3.16.y-ckt stable] Patch "xen-blkback: replace work_pending with work_busy in purge_persistent_gnt()" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Sep 3 10:37:25 UTC 2015


This is a note to let you know that I have just added a patch titled

    xen-blkback: replace work_pending with work_busy in purge_persistent_gnt()

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt17.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 5600b0cf9bb396a64a0bc43af3f64ae19d4163c2 Mon Sep 17 00:00:00 2001
From: Bob Liu <bob.liu at oracle.com>
Date: Wed, 22 Jul 2015 14:40:10 +0800
Subject: xen-blkback: replace work_pending with work_busy in
 purge_persistent_gnt()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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 at citrix.com>
Signed-off-by: Bob Liu <bob.liu at oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.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 63fc7f06a014..02004e101678 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;
 	}





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