mlx4_en: Verify number of RX rings doesn't exceed MAX_RX_RINGS

Required in cases were dev->caps.num_comp_vectors > MAX_RX_RINGS.
For current values this would happen on machines that have more
then 16 cores.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/mlx4/en_main.c b/drivers/net/mlx4/en_main.c
index c1c05852a95e..34f3a191fbdf 100644
--- a/drivers/net/mlx4/en_main.c
+++ b/drivers/net/mlx4/en_main.c
@@ -170,7 +170,8 @@ static void *mlx4_en_add(struct mlx4_dev *dev)
                 mlx4_info(mdev, "Using %d tx rings for port:%d\n",
                           mdev->profile.prof[i].tx_ring_num, i);
                 if (!mdev->profile.prof[i].rx_ring_num) {
-                        mdev->profile.prof[i].rx_ring_num = dev->caps.num_comp_vectors;
+                        mdev->profile.prof[i].rx_ring_num =
+                                min_t(int, dev->caps.num_comp_vectors, MAX_RX_RINGS);
                         mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
                                   mdev->profile.prof[i].rx_ring_num, i);
                 } else