From: Martin Wilck <mwilck@suse.com>
Date: Mon, 27 Jul 2020 18:08:02 +0200
Subject: [PATCH] nvme-multipath: fix logic for non-optimized paths
References: bsc#1172108
Patch-mainline: v5.9-rc1
Git-commit: 3f6e3246db0e6f92e784965d9d0edb8abe6c6b74
Handle the special case where we have exactly one optimized path,
which we should keep using in this case.
Fixes: 75c10e732724 ("nvme-multipath: round-robin I/O policy")
Signed off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/nvme/host/multipath.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 900b35d47ec7..93c70e1591de 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -255,6 +255,12 @@ static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head,
fallback = ns;
}
+ /* No optimized path found, re-check the current path */
+ if (!nvme_path_is_disabled(old) &&
+ old->ana_state == NVME_ANA_OPTIMIZED) {
+ found = old;
+ goto out;
+ }
if (!fallback)
return NULL;
found = fallback;
--
2.16.4