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    Subject[PATCH 3.13 105/151] dm thin: fix dangling bio in process_deferred_bios error path
    Date
    3.13.11.1 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Mike Snitzer <snitzer@redhat.com>

    commit fe76cd88e654124d1431bb662a0fc6e99ca811a5 upstream.

    If unable to ensure_next_mapping() we must add the current bio, which
    was removed from the @bios list via bio_list_pop, back to the
    deferred_bios list before all the remaining @bios.

    Signed-off-by: Mike Snitzer <snitzer@redhat.com>
    Acked-by: Joe Thornber <ejt@redhat.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/md/dm-thin.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
    index e9587101..e4cc196 100644
    --- a/drivers/md/dm-thin.c
    +++ b/drivers/md/dm-thin.c
    @@ -1332,9 +1332,9 @@ static void process_deferred_bios(struct pool *pool)
    */
    if (ensure_next_mapping(pool)) {
    spin_lock_irqsave(&pool->lock, flags);
    + bio_list_add(&pool->deferred_bios, bio);
    bio_list_merge(&pool->deferred_bios, &bios);
    spin_unlock_irqrestore(&pool->lock, flags);
    -
    break;
    }

    --
    1.9.1


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