On Mon, Sep 18, 2023 at 5:37 PM Zhu Yanjun <yanjun.zhu@xxxxxxxxx> wrote:
>
> From: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>
>
> No functional change. The function get_next_path_rr needs to hold
> rcu_read_lock. As such, if no rcu read lock, warnings will pop out.
>
> Signed-off-by: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>
Acked-by: Jack Wang <jinpu.wang@xxxxxxxxx>
Thx!
> ---
> drivers/infiniband/ulp/rtrs/rtrs-clt.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> index b6ee801fd0ff..bc4b70318bf4 100644
> --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> @@ -775,7 +775,7 @@ rtrs_clt_get_next_path_or_null(struct list_head *head, struct rtrs_clt_path *clt
> * Related to @MP_POLICY_RR
> *
> * Locks:
> - * rcu_read_lock() must be hold.
> + * rcu_read_lock() must be held.
> */
> static struct rtrs_clt_path *get_next_path_rr(struct path_it *it)
> {
> @@ -783,6 +783,11 @@ static struct rtrs_clt_path *get_next_path_rr(struct path_it *it)
> struct rtrs_clt_path *path;
> struct rtrs_clt_sess *clt;
>
> + /*
> + * Assert that rcu lock must be held
> + */
> + WARN_ON_ONCE(!rcu_read_lock_held());
> +
> clt = it->clt;
>
> /*
> --
> 2.40.1
>
