From: Chao Leng <lengchao@huawei.com>
Date: Thu, 28 Jan 2021 11:33:51 +0800
Subject: [PATCH] nvme-core: use list_add_tail_rcu instead of list_add_tail for
 nvme_init_ns_head
Git-commit: 772ea326a4a00b6b4b2c8f3606ad10c31f46c511
Patch-mainline: v5.11-rc1
References: git-fixes

The "list" of nvme_ns_head is used as rcu list, now in nvme_init_ns_head
list_add_tail is used to add ns->siblings to the rcu list. It is not safe.
Should use list_add_tail_rcu instead of list_add_tail.

Signed-off-by: Chao Leng <lengchao@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/nvme/host/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 8caf9b34734d..f13eb4ded95f 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3829,7 +3829,7 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
 		}
 	}
 
-	list_add_tail(&ns->siblings, &head->list);
+	list_add_tail_rcu(&ns->siblings, &head->list);
 	ns->head = head;
 	mutex_unlock(&ctrl->subsys->lock);
 	return 0;
-- 
2.29.2