[dpdk-dev] [PATCH] net/mlx5: fix crash when configure is not called

[Adrien Mazarguil <adrien.mazarguil@6wind.com>]

Although uncommon, applications may destroy a device immediately after
probing it without going through dev_configure() first.

This patch addresses a crash which occurs when mlx5_dev_close() calls
mlx5_mr_release() due to an uninitialized entry in the private structure.

Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support")
Cc: Yongseok Koh <yskoh@mellanox.com>

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx5/mlx5.c        | 7 +++++++
 drivers/net/mlx5/mlx5_ethdev.c | 4 ----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 36d72f757..11b395b64 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -34,6 +34,8 @@
 #include <rte_config.h>
 #include <rte_eal_memconfig.h>
 #include <rte_kvargs.h>
+#include <rte_rwlock.h>
+#include <rte_spinlock.h>
 
 #include "mlx5.h"
 #include "mlx5_utils.h"
@@ -1145,6 +1147,11 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 			goto port_error;
 		}
 		priv->config.max_verbs_prio = verb_priorities;
+		/* Add device to memory callback list. */
+		rte_rwlock_write_lock(&mlx5_shared_data->mem_event_rwlock);
+		LIST_INSERT_HEAD(&mlx5_shared_data->mem_event_cb_list,
+				 priv, mem_event_cb);
+		rte_rwlock_write_unlock(&mlx5_shared_data->mem_event_rwlock);
 		rte_eth_dev_probing_finish(eth_dev);
 		continue;
 port_error:
diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index c52ec6fb7..f6cebae41 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -403,10 +403,6 @@ mlx5_dev_configure(struct rte_eth_dev *dev)
 		/* rte_errno is already set. */
 		return -rte_errno;
 	}
-	rte_rwlock_write_lock(&mlx5_shared_data->mem_event_rwlock);
-	LIST_INSERT_HEAD(&mlx5_shared_data->mem_event_cb_list,
-			 priv, mem_event_cb);
-	rte_rwlock_write_unlock(&mlx5_shared_data->mem_event_rwlock);
 	return 0;
 }
 
-- 
2.11.0