net/mlx4_en: Avoid adding steering rules with invalid ring
Inserting steering rules with illegal ring is an invalid operation, block it. Fixes: 82067281 ('net/mlx4_en: Manage flow steering rules with ethtool') Signed-off-by: Talat Batheesh <talatb@mellanox.com> Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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