[PATCH 5.4 52/61] nvme-multipath: Early exit if no path is available

[Greg Kroah-Hartman]

From: Daniel Wagner <dwag...@suse.de>

[ Upstream commit d1bcf006a9d3d63c1bcb65a993cb13756954cd9c ]

nvme_round_robin_path() should test if the return ns pointer is valid.
nvme_next_ns() will return a NULL pointer if there is no path left.

Fixes: 75c10e732724 ("nvme-multipath: round-robin I/O policy")
Signed-off-by: Daniel Wagner <dwag...@suse.de>
Reviewed-by: Hannes Reinecke <h...@suse.de>
Signed-off-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/nvme/host/multipath.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 3968f89f7855a..0ac0bd4c65c4c 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -233,7 +233,7 @@ static struct nvme_ns *nvme_round_robin_path(struct 
nvme_ns_head *head,
        }
 
        for (ns = nvme_next_ns(head, old);
-            ns != old;
+            ns && ns != old;
             ns = nvme_next_ns(head, ns)) {
                if (nvme_path_is_disabled(ns))
                        continue;
-- 
2.27.0