[PATCH 4.14 28/69] net/mlx5e: Fix error handling when refreshing TIRs

[Greg Kroah-Hartman]

From: Gavi Teitz <g...@mellanox.com>

[ Upstream commit bc87a0036826a37b43489b029af8143bd07c6cca ]

Previously, a false positive would be caught if the TIRs list is
empty, since the err value was initialized to -ENOMEM, and was only
updated if a TIR is refreshed. This is resolved by initializing the
err value to zero.

Fixes: b676f653896a ("net/mlx5e: Refactor refresh TIRs")
Signed-off-by: Gavi Teitz <g...@mellanox.com>
Reviewed-by: Roi Dayan <r...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_common.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
@@ -140,15 +140,17 @@ int mlx5e_refresh_tirs(struct mlx5e_priv
 {
        struct mlx5_core_dev *mdev = priv->mdev;
        struct mlx5e_tir *tir;
-       int err  = -ENOMEM;
+       int err  = 0;
        u32 tirn = 0;
        int inlen;
        void *in;
 
        inlen = MLX5_ST_SZ_BYTES(modify_tir_in);
        in = kvzalloc(inlen, GFP_KERNEL);
-       if (!in)
+       if (!in) {
+               err = -ENOMEM;
                goto out;
+       }
 
        if (enable_uc_lb)
                MLX5_SET(modify_tir_in, in, ctx.self_lb_block,