linux-kernel - [PATCH] nvme-multipath: Early exit if no path is available

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Message-Id: <20210122174125.145734-1-dwagner@suse.de>
Date:   Fri, 22 Jan 2021 18:41:25 +0100
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH] nvme-multipath: Early exit if no path is available

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.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/host/multipath.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index d578de0ce3aa..8837e9da1ccf 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -239,6 +239,8 @@ static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head,
 	for (ns = nvme_next_ns(head, old);
 	     ns != old;
 	     ns = nvme_next_ns(head, ns)) {
+		if (!ns)
+			break;
 		if (nvme_path_is_disabled(ns))
 			continue;
 
-- 
2.29.2