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From:   Nathan Chancellor <nathan@kernel.org>
To:     Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, netdev@vger.kernel.org,
        linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
        llvm@lists.linux.dev, patches@lists.linux.dev,
        Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH net-next] net/mlx5e: Do not use err uninitialized in mlx5e_rep_add_meta_tunnel_rule()
Date:   Thu, 25 Aug 2022 11:06:07 -0700
Message-Id: <20220825180607.2707947-1-nathan@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Clang warns:

  drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:481:6: error: variable 'err' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
          if (IS_ERR(flow_rule)) {
              ^~~~~~~~~~~~~~~~~
  drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:489:9: note: uninitialized use occurs here
          return err;
                ^~~
  drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:481:2: note: remove the 'if' if its condition is always true
          if (IS_ERR(flow_rule)) {
          ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:474:9: note: initialize the variable 'err' to silence this warning
          int err;
                ^
                  = 0
  1 error generated.

There is little reason to have the 'goto + error variable' construct in
this function. Get rid of it and just return the PTR_ERR value in the if
statement and 0 at the end.

Fixes: 430e2d5e2a98 ("net/mlx5: E-Switch, Move send to vport meta rule creation")
Link: https://github.com/ClangBuiltLinux/linux/issues/1695
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index c8617a62e542..a977804137a8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -471,22 +471,18 @@ mlx5e_rep_add_meta_tunnel_rule(struct mlx5e_priv *priv)
 	struct mlx5_eswitch_rep *rep = rpriv->rep;
 	struct mlx5_flow_handle *flow_rule;
 	struct mlx5_flow_group *g;
-	int err;
 
 	g = esw->fdb_table.offloads.send_to_vport_meta_grp;
 	if (!g)
 		return 0;
 
 	flow_rule = mlx5_eswitch_add_send_to_vport_meta_rule(esw, rep->vport);
-	if (IS_ERR(flow_rule)) {
-		err = PTR_ERR(flow_rule);
-		goto out;
-	}
+	if (IS_ERR(flow_rule))
+		return PTR_ERR(flow_rule);
 
 	rpriv->send_to_vport_meta_rule = flow_rule;
 
-out:
-	return err;
+	return 0;
 }
 
 static void

base-commit: c19d893fbf3f2f8fa864ae39652c7fee939edde2
-- 
2.37.2