From: Adi Nissim <a...@mellanox.com>

MTU helper function is used by both conventional mlx5e
instances (PF/VF) and the eswitch representors. The representor
shouldn't change the nic vport context MTU, the VF is responsible for
that. Therefore set_mtu_cb has a null value when changing the
representor MTU.

Fixes: 250a42b6a764 ("net/mlx5e: Support configurable MTU for vport 
representors")
Signed-off-by: Adi Nissim <a...@mellanox.com>
Reviewed-by: Yevgeny Kliteynik <klit...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index dae4156a710d..c592678ab5f1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3712,7 +3712,8 @@ int mlx5e_change_mtu(struct net_device *netdev, int 
new_mtu,
 
        if (!reset) {
                params->sw_mtu = new_mtu;
-               set_mtu_cb(priv);
+               if (set_mtu_cb)
+                       set_mtu_cb(priv);
                netdev->mtu = params->sw_mtu;
                goto out;
        }
-- 
2.17.0

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