Hi, Chengfeng
Thank you for the fix, we can adopt this (ie Upstream ML is not "wrong place" 😊)
I have some minor comment about:
- the problem should be described in past tense (should b e"sh->txpp.mutex WAS
not correctly")
- headline should be more specific, like "fix mutex unlock in txpp cleanup")
- "Fixes:" tag should be present
- Cc: sta...@dpdk.org should be present
Could you, please, update and send v3 ?
With best regards,
Slava
> -----Original Message-----
> From: dev <dev-boun...@dpdk.org> On Behalf Of YE Chengfeng
> Sent: Thursday, August 26, 2021 22:06
> To: asoma...@amd.com
> Cc: dev@dpdk.org
> Subject: [dpdk-dev] 回复: [PATCH v2] net/mlx5: fix potential unreleased lock
> problem
>
> It seems that I send this patch to a wrong place, please just ignore it.
>
> Thanks,
> Chengfeng
> ________________________________
> 发件人: YE Chengfeng <cy...@connect.ust.hk>
> 发送时间: 2021年8月27日 2:56
> 收件人: asoma...@amd.com <asoma...@amd.com>
> 抄送: dev@dpdk.org <dev@dpdk.org>; YE Chengfeng
> <cy...@connect.ust.hk>
> 主题: [PATCH v2] net/mlx5: fix potential unreleased lock problem
>
> The lock sh->txpp.mutex isn't correctly released if the function return in
> these two branches, which may lead to deadlock if the lock is acquired again.
>
> Cc: cy...@connect.ust.hk
> Bugzilla ID: 774
>
> Signed-off-by: Chengfeng Ye <cy...@connect.ust.hk>
> ---
> drivers/net/mlx5/mlx5_txpp.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/mlx5/mlx5_txpp.c b/drivers/net/mlx5/mlx5_txpp.c
> index 4f6da9f2d1..0ece788a84 100644
> --- a/drivers/net/mlx5/mlx5_txpp.c
> +++ b/drivers/net/mlx5/mlx5_txpp.c
> @@ -961,8 +961,12 @@ mlx5_txpp_stop(struct rte_eth_dev *dev)
> MLX5_ASSERT(!ret);
> RTE_SET_USED(ret);
> MLX5_ASSERT(sh->txpp.refcnt);
> - if (!sh->txpp.refcnt || --sh->txpp.refcnt)
> + if (!sh->txpp.refcnt || --sh->txpp.refcnt) {
> + ret = pthread_mutex_unlock(&sh->txpp.mutex);
> + MLX5_ASSERT(!ret);
> + RTE_SET_USED(ret);
> return;
> + }
> /* No references any more, do actual destroy. */
> mlx5_txpp_destroy(sh);
> ret = pthread_mutex_unlock(&sh->txpp.mutex);
> --
> 2.17.1
