linux-kernel - [PATCH 5.15 049/201] nvme: check for duplicate identifiers earlier

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Message-Id: <20220727161028.923733857@linuxfoundation.org>
Date:   Wed, 27 Jul 2022 18:09:13 +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, Christoph Hellwig <hch@....de>,
        Keith Busch <kbusch@...nel.org>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 049/201] nvme: check for duplicate identifiers earlier

From: Christoph Hellwig <hch@....de>

[ Upstream commit e2d77d2e11c4f1e70a1a24cc8fe63ff3dc9b53ef ]

Lift the check for duplicate identifiers into nvme_init_ns_head, which
avoids pointless error unwinding in case they don't match, and also
matches where we check identifier validity for the multipath case.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Keith Busch <kbusch@...nel.org>
Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 29b56ea01132..8fca84d44446 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3686,13 +3686,6 @@ static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
 	head->ids = *ids;
 	kref_init(&head->ref);
 
-	ret = nvme_subsys_check_duplicate_ids(ctrl->subsys, &head->ids);
-	if (ret) {
-		dev_err(ctrl->device,
-			"duplicate IDs for nsid %d\n", nsid);
-		goto out_cleanup_srcu;
-	}
-
 	if (head->ids.csi) {
 		ret = nvme_get_effects_log(ctrl, head->ids.csi, &head->effects);
 		if (ret)
@@ -3731,6 +3724,12 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
 	mutex_lock(&ctrl->subsys->lock);
 	head = nvme_find_ns_head(ctrl, nsid);
 	if (!head) {
+		ret = nvme_subsys_check_duplicate_ids(ctrl->subsys, ids);
+		if (ret) {
+			dev_err(ctrl->device,
+				"duplicate IDs for nsid %d\n", nsid);
+			goto out_unlock;
+		}
 		head = nvme_alloc_ns_head(ctrl, nsid, ids);
 		if (IS_ERR(head)) {
 			ret = PTR_ERR(head);
-- 
2.35.1