[dpdk-dev] [PATCH] net/mlx5: fix port dead lock when port shutdown

[Xueming Li]

This patch add check to avoid init device MR data twcie which caused
priv data linked to itself in list.

Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support")
Cc: yskoh at mellanox.com

Signed-off-by: Xueming Li <xuemingl at mellanox.com>
---
 drivers/net/mlx5/mlx5_ethdev.c | 2 ++
 drivers/net/mlx5/mlx5_mr.c     | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index c52ec6fb7..7ffd17ff3 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -398,6 +398,8 @@ mlx5_dev_configure(struct rte_eth_dev *dev)
 	 * deadlock. If it overflows, lookup should be done by searching MR list
 	 * linearly, which is slow.
 	 */
+	if (priv->mr.cache.table)
+		return 0;
 	if (mlx5_mr_btree_init(&priv->mr.cache, MLX5_MR_BTREE_CACHE_N * 2,
 			       dev->device->numa_node)) {
 		/* rte_errno is already set. */
diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
index abb1f5179..08105a443 100644
--- a/drivers/net/mlx5/mlx5_mr.c
+++ b/drivers/net/mlx5/mlx5_mr.c
@@ -191,6 +191,7 @@ mlx5_mr_btree_init(struct mlx5_mr_btree *bt, int n, int socket)
 		rte_errno = EINVAL;
 		return -rte_errno;
 	}
+	assert(!bt->table && !bt->size);
 	memset(bt, 0, sizeof(*bt));
 	bt->table = rte_calloc_socket("B-tree table",
 				      n, sizeof(struct mlx5_mr_cache),
-- 
2.13.3