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    Subject[PATCH 3.16.y-ckt 089/130] xen-blkback: replace work_pending with work_busy in purge_persistent_gnt()
    Date
    3.16.7-ckt17 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Bob Liu <bob.liu@oracle.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@citrix.com>
    Signed-off-by: Bob Liu <bob.liu@oracle.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    [ luis: backported to 3.16: adjusted context ]
    Signed-off-by: Luis Henriques <luis.henriques@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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