From: Bob Liu <bob.liu@oracle.com>
To: xen-devel@lists.xenproject.org
Cc: david.vrabel@citrix.com, linux-kernel@vger.kernel.org,
roger.pau@citrix.com, konrad.wilk@oracle.com,
Bob Liu <bob.liu@oracle.com>
Subject: [PATCH 3/3] xen-blkback: rm BUG_ON() in purge_persistent_gnt()
Date: Tue, 21 Jul 2015 11:30:41 +0800 [thread overview]
Message-ID: <1437449441-2964-3-git-send-email-bob.liu@oracle.com> (raw)
In-Reply-To: <1437449441-2964-1-git-send-email-bob.liu@oracle.com>
This BUG_ON() will be triggered when previous purge work haven't finished.
It's reasonable under pretty extreme load and should not panic the system.
Signed-off-by: Bob Liu <bob.liu@oracle.com>
---
drivers/block/xen-blkback/blkback.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index ced9677..b90ac8e 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -394,7 +394,9 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)
pr_debug("Going to purge %u persistent grants\n", num_clean);
- BUG_ON(!list_empty(&blkif->persistent_purge_list));
+ if (!list_empty(&blkif->persistent_purge_list))
+ return;
+
root = &blkif->persistent_gnts;
purge_list:
foreach_grant_safe(persistent_gnt, n, root, node) {
--
1.7.10.4
next prev parent reply other threads:[~2015-07-21 3:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-21 3:30 [PATCH 1/3] xen-blkfront: introduce blkfront_gather_backend_features() Bob Liu
2015-07-21 3:30 ` [PATCH 2/3] xen-blkfront: rm BUG_ON(info->feature_persistent) in blkif_free Bob Liu
2015-07-21 9:25 ` Roger Pau Monné
2015-07-22 4:43 ` Bob Liu
2015-07-22 5:34 ` Bob Liu
2015-07-21 3:30 ` Bob Liu [this message]
2015-07-21 9:13 ` [PATCH 3/3] xen-blkback: rm BUG_ON() in purge_persistent_gnt() Roger Pau Monné
2015-07-21 10:50 ` Bob Liu
2015-07-21 9:32 ` [PATCH 1/3] xen-blkfront: introduce blkfront_gather_backend_features() Roger Pau Monné
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