From: Yongseok Koh <yskoh@mellanox.com>
Date: Tue, 19 Jun 2018 23:13:13 +0000 (-0700)
Subject: net/mlx5: fix error number handling
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=5cffc8b28dc874d04df7675abf7187c271524f70;p=dpdk.git

net/mlx5: fix error number handling

rte_errno should be saved only if error has occurred because rte_errno
could have garbage value.

Fixes: a6d83b6a9209 ("net/mlx5: standardize on negative errno values")
Cc: stable@dpdk.org

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 994be05be6..45207d70ec 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -3561,15 +3561,17 @@ wrong_flow:
 		/* The flow does not match. */
 		continue;
 	}
-	ret = rte_errno; /* Save rte_errno before cleanup. */
 	if (flow)
 		mlx5_flow_list_destroy(dev, &priv->flows, flow);
 exit:
+	if (ret)
+		ret = rte_errno; /* Save rte_errno before cleanup. */
 	for (i = 0; i != hash_rxq_init_n; ++i) {
 		if (parser.queue[i].ibv_attr)
 			rte_free(parser.queue[i].ibv_attr);
 	}
-	rte_errno = ret; /* Restore rte_errno. */
+	if (ret)
+		rte_errno = ret; /* Restore rte_errno. */
 	return -rte_errno;
 }