linux-kernel - [PATCH net-next] mlx5: Restore err assignment in mlx5_mdev

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Date:   Fri, 29 May 2020 22:54:48 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, Parav Pandit <parav@...lanox.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH net-next] mlx5: Restore err assignment in mlx5_mdev_init

Clang warns:

drivers/net/ethernet/mellanox/mlx5/core/main.c:1278:6: warning: variable
'err' is used uninitialized whenever 'if' condition is true
[-Wsometimes-uninitialized]
        if (!priv->dbg_root) {
            ^~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/main.c:1303:9: note:
uninitialized use occurs here
        return err;
               ^~~
drivers/net/ethernet/mellanox/mlx5/core/main.c:1278:2: note: remove the
'if' if its condition is always false
        if (!priv->dbg_root) {
        ^~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/main.c:1259:9: note: initialize
the variable 'err' to silence this warning
        int err;
               ^
                = 0
1 warning generated.

This path previously returned -ENOMEM, restore that error code so that
it is not uninitialized.

Fixes: 810cbb25549b ("net/mlx5: Add missing mutex destroy")
Link: https://github.com/ClangBuiltLinux/linux/issues/1042
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index df46b1fce3a7..ac68445fde2d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1277,6 +1277,7 @@ static int mlx5_mdev_init(struct mlx5_core_dev *dev, int profile_idx)
 					    mlx5_debugfs_root);
 	if (!priv->dbg_root) {
 		dev_err(dev->device, "mlx5_core: error, Cannot create debugfs dir, aborting\n");
+		err = -ENOMEM;
 		goto err_dbg_root;
 	}
 

base-commit: c0cc73b79123e67b212bd537a7af88e52c9fbeac
-- 
2.27.0.rc0