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nvme: fix inconsistent RCU list manipulation in nvme_ns_add_to_ctrl_list()

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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: be647e2c76 ("nvme: use srcu for iterating namespace list")
Signed-off-by: Zheng Qixing <zhengqixing@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Zheng Qixing 2025-07-01 15:17:17 +08:00 committed by Christoph Hellwig
parent 3051247e4f
commit 80d7762e0a
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/core.c
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@ -4077,7 +4077,7 @@ 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)