[dpdk-dev] [PATCH v2 1/1] net/mlx5: fix sharing context destroy order

[Viacheslav Ovsiienko]

At the mlx5 device closing the shared IB context was destroyed
before cleanup routines completion. As it was found on some
setups (Netlink fails with old kernel drivers and we have to use
sysfs to retrieve interface index, this requires IB device name,
which is stored in shared context) the mlx5_nl_mac_addr_flush()
requires IB device name, and if shared context is removed it
causes the segmentation fault.

Fixes: 17e19bc4dde7 ("net/mlx5: add IB shared context alloc/free functions")

Signed-off-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>
---
v2:
    rebasing only

v1:
    http://patches.dpdk.org/patch/52193/
 
drivers/net/mlx5/mlx5.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index b7e6234..475c93d 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -593,9 +593,6 @@ struct mlx5_dev_spawn_data {
 	mlx5_mr_release(dev);
 	assert(priv->sh);
 	mlx5_free_shared_dr(priv);
-	if (priv->sh)
-		mlx5_free_shared_ibctx(priv->sh);
-	priv->sh = NULL;
 	if (priv->rss_conf.rss_key != NULL)
 		rte_free(priv->rss_conf.rss_key);
 	if (priv->reta_idx != NULL)
@@ -608,6 +605,16 @@ struct mlx5_dev_spawn_data {
 		close(priv->nl_socket_rdma);
 	if (priv->tcf_context)
 		mlx5_flow_tcf_context_destroy(priv->tcf_context);
+	if (priv->sh) {
+		/*
+		 * Free the shared context in last turn, because the cleanup
+		 * routines above may use some shared fields, like
+		 * mlx5_nl_mac_addr_flush() uses ibdev_path for retrieveing
+		 * ifindex if Netlink fails.
+		 */
+		mlx5_free_shared_ibctx(priv->sh);
+		priv->sh = NULL;
+	}
 	ret = mlx5_hrxq_ibv_verify(dev);
 	if (ret)
 		DRV_LOG(WARNING, "port %u some hash Rx queue still remain",
-- 
1.8.3.1