[dpdk-dev] [Bug 774] Potential deadlock error due to the unrelased lock

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=774

            Bug ID: 774
           Summary: Potential deadlock error due to the unrelased lock
           Product: DPDK
           Version: 21.08
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: dg573847474@gmail.com
  Target Milestone: ---

source:
dpdk/drivers/net/mlx5/mlx5_txpp.c

Hi, developers, thank you for your checking. The lock &sh->txpp.mutex may be
not released correctly the method returns at the branch !sh->txpp.refcnt ||
--sh->txpp.refcnt satisfies. The fix is to insert
pthread_mutex_lock(&sh->txpp.mutex); before returning.

void
mlx5_txpp_stop(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_dev_ctx_shared *sh = priv->sh;
        int ret;

        if (!priv->txpp_en) {
                return;
        }
        priv->txpp_en = 0;
        ret = pthread_mutex_lock(&sh->txpp.mutex); // the lock
        MLX5_ASSERT(!ret);
        RTE_SET_USED(ret);
        MLX5_ASSERT(sh->txpp.refcnt);
        if (!sh->txpp.refcnt || --sh->txpp.refcnt)
                return;  // return without releasing

        mlx5_txpp_destroy(sh);
        ret = pthread_mutex_unlock(&sh->txpp.mutex);
        MLX5_ASSERT(!ret);
        RTE_SET_USED(ret);
}

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