dm mpath: stop queueing IO when no valid paths exist

'queue_io' is set so that IO is queued while paths are being
initialized.  Clear queue_io in __choose_pgpath if there are no valid
paths, since there are obviously no paths that can be initialized.
Otherwise IOs to the device will back up.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 833d7e752f06..7b6b0f0f831a 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -317,8 +317,10 @@ static void __choose_pgpath(struct multipath *m, size_t nr_bytes)
         struct priority_group *pg;
         unsigned bypassed = 1;
 
-        if (!m->nr_valid_paths)
+        if (!m->nr_valid_paths) {
+                m->queue_io = 0;
                 goto failed;
+        }
 
         /* Were we instructed to switch PG? */
         if (m->next_pg) {