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: dg573847...@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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