[Xen-devel] [PATCH 3/3] xen-blkback: rm BUG_ON() in purge_persistent_gnt()

[Bob Liu <bob.liu@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 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


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