From: Benjamin Marzinski <bmarzins@redhat.com>
Date: Wed, 13 Aug 2014 18:53:42 +0000 (-0500)
Subject: dm mpath: stop queueing IO when no valid paths exist
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1f271972478d84dd9e4d6dd82f414d70ed9e78ce;p=linux-beck.git

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>
---

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) {