6.15-stable review patch. If anyone has any objections, please let me know.
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From: Zheng Qixing zhengqixing@huawei.com
[ Upstream commit 80d7762e0a42307ee31b21f090e21349b98c14f6 ]
When inserting a namespace into the controller's namespace list, the function uses list_add_rcu() when the namespace is inserted in the middle of the list, but falls back to a regular list_add() when adding at the head of the list.
This inconsistency could lead to race conditions during concurrent access, as users might observe a partially updated list. Fix this by consistently using list_add_rcu() in both code paths to ensure proper RCU protection throughout the entire function.
Fixes: be647e2c76b2 ("nvme: use srcu for iterating namespace list") Signed-off-by: Zheng Qixing zhengqixing@huawei.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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 ae584c97f5284..300e33e4742a5 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3889,7 +3889,7 @@ static void nvme_ns_add_to_ctrl_list(struct nvme_ns *ns) return; } } - list_add(&ns->list, &ns->ctrl->namespaces); + list_add_rcu(&ns->list, &ns->ctrl->namespaces); }
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info)