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Date:   Wed, 27 May 2020 00:50:22 -0700
From:   Nathan Chancellor <>
To:     Saeed Mahameed <>,
        Leon Romanovsky <>
        Nathan Chancellor <>
Subject: [PATCH] net/mlx5e: Don't use err uninitialized in mlx5e_attach_decap

Clang warns:

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3712:6: warning:
variable 'err' is used uninitialized whenever 'if' condition is false
        if (IS_ERR(d->pkt_reformat)) {
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3718:6: note:
uninitialized use occurs here
        if (err)
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3712:2: note: remove the
'if' if its condition is always true
        if (IS_ERR(d->pkt_reformat)) {
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3670:9: note: initialize
the variable 'err' to silence this warning
        int err;
                = 0
1 warning generated.

It is not wrong, err is only ever initialized in if statements but this
one is not in one. Initialize err to 0 to fix this.

Fixes: 14e6b038afa0 ("net/mlx5e: Add support for hw decapsulation of MPLS over UDP")
Signed-off-by: Nathan Chancellor <>
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index fdb7d2686c35..6d0d4896fe0c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3667,7 +3667,7 @@ static int mlx5e_attach_decap(struct mlx5e_priv *priv,
 	struct mlx5e_decap_entry *d;
 	struct mlx5e_decap_key key;
 	uintptr_t hash_key;
-	int err;
+	int err = 0;
 	parse_attr = attr->parse_attr;
 	if (sizeof(parse_attr->eth) > MLX5_CAP_ESW(priv->mdev, max_encap_header_size)) {

base-commit: d3d9065ad99d0d8d732c950cc0a37a7883cd0c60

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