net/mlx4: Use single completion vector after NOP failure

Fix a crash at the error flow of NOP command which caused the driver to try and use
a completion vector which wasn't allocated.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index ee6f4fe00837..a0313de122de 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -1975,6 +1975,8 @@ slave_start:
         if (err == -EBUSY && (dev->flags & MLX4_FLAG_MSI_X) &&
             !mlx4_is_mfunc(dev)) {
                 dev->flags &= ~MLX4_FLAG_MSI_X;
+                dev->caps.num_comp_vectors = 1;
+                dev->caps.comp_pool        = 0;
                 pci_disable_msix(pdev);
                 err = mlx4_setup_hca(dev);
         }