From 9157c8d3e2d318581ecc8bdf34367d57f19c5380 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@wdc.com>
Date: Wed, 9 Aug 2017 11:32:14 -0700
Subject: dm mpath: complain about unsupported __multipath_map_bio() return
 values

WARN_ONCE() if __multipath_map_bio() returns an unsupported return value.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 drivers/md/dm-mpath.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'drivers/md')

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 97bca9464395..7406ededf875 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -632,6 +632,10 @@ static void process_queued_bios(struct work_struct *work)
 		case DM_MAPIO_REMAPPED:
 			generic_make_request(bio);
 			break;
+		case 0:
+			break;
+		default:
+			WARN_ONCE(true, "__multipath_map_bio() returned %d\n", r);
 		}
 	}
 	blk_finish_plug(&plug);
-- 
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