linux-kernel - [PATCH 4.19 66/72] nvme-multipath: relax ANA state check

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Message-Id: <20190502143338.545674853@linuxfoundation.org>
Date:   Thu,  2 May 2019 17:21:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martin George <marting@...app.com>,
        Gargi Srinivas <sring@...app.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: [PATCH 4.19 66/72] nvme-multipath: relax ANA state check

[ Upstream commit cc2278c413c3a06a93c23ee8722e4dd3d621de12 ]

When undergoing state transitions I/O might be requeued, hence
we should always call nvme_mpath_set_live() to schedule requeue_work
whenever the nvme device is live, independent on whether the
old state was live or not.

Signed-off-by: Martin George <marting@...app.com>
Signed-off-by: Gargi Srinivas <sring@...app.com>
Signed-off-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 drivers/nvme/host/multipath.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index da8f5ad30c71..260248fbb8fe 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -349,15 +349,12 @@ static inline bool nvme_state_is_live(enum nvme_ana_state state)
 static void nvme_update_ns_ana_state(struct nvme_ana_group_desc *desc,
 		struct nvme_ns *ns)
 {
-	enum nvme_ana_state old;
-
 	mutex_lock(&ns->head->lock);
-	old = ns->ana_state;
 	ns->ana_grpid = le32_to_cpu(desc->grpid);
 	ns->ana_state = desc->state;
 	clear_bit(NVME_NS_ANA_PENDING, &ns->flags);
 
-	if (nvme_state_is_live(ns->ana_state) && !nvme_state_is_live(old))
+	if (nvme_state_is_live(ns->ana_state))
 		nvme_mpath_set_live(ns);
 	mutex_unlock(&ns->head->lock);
 }
-- 
2.19.1