net/mlx5: Don't fail driver on failure to create debugfs

Clang warns:

drivers/net/ethernet/mellanox/mlx5/core/main.c:1278:6: warning: variable
'err' is used uninitialized whenever 'if' condition is true
        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.

The check of returned value of debugfs_create_dir() is wrong because
by the design debugfs failures should never fail the driver and the
check itself was wrong too. The kernel compiled without CONFIG_DEBUG_FS
will return ERR_PTR(-ENODEV) and not NULL as expected.

Fixes: 11f3b84d7068 ("net/mlx5: Split mdev init and pci init")
Reported-by: Nathan Chancellor <>
Signed-off-by: Leon Romanovsky <>
Reviewed-by: Nathan Chancellor <>
Signed-off-by: Saeed Mahameed <>
1 file changed