linux-kernel - [PATCH] vdpa/mlx5: simplfy error handler in mlx5_vdpa_dev

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Date:   Sun,  9 Jan 2022 05:24:22 -0800
From:   trix@...hat.com
To:     mst@...hat.com, jasowang@...hat.com, elic@...dia.com,
        parav@...dia.com, si-wei.liu@...cle.com, xieyongji@...edance.com
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] vdpa/mlx5: simplfy error handler in mlx5_vdpa_dev_add()

From: Tom Rix <trix@...hat.com>

The use of pfmdev is protected by two calls to is_zero_ether_add().
The second call in the error handler can be replaced by
checking if pfmdev was set as part of the earlier call.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 37220f6db7ad7..2d38b8fe9305e 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2530,7 +2530,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 {
 	struct mlx5_vdpa_mgmtdev *mgtdev = container_of(v_mdev, struct mlx5_vdpa_mgmtdev, mgtdev);
 	struct virtio_net_config *config;
-	struct mlx5_core_dev *pfmdev;
+	struct mlx5_core_dev *pfmdev = NULL;
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
 	struct mlx5_core_dev *mdev;
@@ -2654,7 +2654,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 err_res:
 	mlx5_vdpa_free_resources(&ndev->mvdev);
 err_mpfs:
-	if (!is_zero_ether_addr(config->mac))
+	if (pfmdev)
 		mlx5_mpfs_del_mac(pfmdev, config->mac);
 err_mtu:
 	mutex_destroy(&ndev->reslock);
-- 
2.26.3