linux-kernel - [PATCH v2] net/mlx4_core: Fix error handling in mlx4_init_port

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Message-Id: <20180513233845.135290-1-tarick@google.com>
Date:   Sun, 13 May 2018 16:38:45 -0700
From:   Tarick Bedeir <tarick@...gle.com>
To:     tariqt@...lanox.com, gthelen@...gle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        tarick@...gle.com
Cc:     Greg Thelen <gthelen@...gle.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tarick Bedeir <tarick@...gle.com>
Subject: [PATCH v2] net/mlx4_core: Fix error handling in mlx4_init_port_info.

Avoid exiting the function with a lingering sysfs file (if the first
call to device_create_file() fails while the second succeeds), and avoid
calling devlink_port_unregister() twice.

In other words, either mlx4_init_port_info() succeeds and returns zero, or
it fails, returns non-zero, and requires no cleanup.

Fixes: 096335b3f983 ("mlx4_core: Allow dynamic MTU configuration for IB
ports")
Signed-off-by: Tarick Bedeir <tarick@...gle.com>
---
v1 -> v2: Added "Fixes" tag.
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 4d84cab77105..e8a3a45d0b53 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -3007,6 +3007,7 @@ static int mlx4_init_port_info(struct mlx4_dev *dev, int port)
 		mlx4_err(dev, "Failed to create file for port %d\n", port);
 		devlink_port_unregister(&info->devlink_port);
 		info->port = -1;
+		return err;
 	}
 
 	sprintf(info->dev_mtu_name, "mlx4_port%d_mtu", port);
@@ -3028,9 +3029,10 @@ static int mlx4_init_port_info(struct mlx4_dev *dev, int port)
 				   &info->port_attr);
 		devlink_port_unregister(&info->devlink_port);
 		info->port = -1;
+		return err;
 	}
 
-	return err;
+	return 0;
 }
 
 static void mlx4_cleanup_port_info(struct mlx4_port_info *info)
-- 
2.17.0.441.gb46fe60e1d-goog