net/mlx4_core: Do not BUG_ON during reset when PCI is offline

The PCI channel could go offline during reset due to EEH.  Don't bug on in
this case, the error is recoverable.

Fixes: f6bc11e42646 ('net/mlx4_core: Enhance the catas flow to support device reset')
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/catas.c b/drivers/net/ethernet/mellanox/mlx4/catas.c
index 715de8a..c7e9399 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/catas.c
+++ b/drivers/net/ethernet/mellanox/mlx4/catas.c
@@ -182,10 +182,17 @@ void mlx4_enter_error_state(struct mlx4_dev_persistent *persist)
                err = mlx4_reset_slave(dev);
        else
                err = mlx4_reset_master(dev);
-       BUG_ON(err != 0);
 
+       if (!err) {
+               mlx4_err(dev, "device was reset successfully\n");
+       } else {
+               /* EEH could have disabled the PCI channel during reset. That's
+                * recoverable and the PCI error flow will handle it.
+                */
+               if (!pci_channel_offline(dev->persist->pdev))
+                       BUG_ON(1);
+       }
        dev->persist->state |= MLX4_DEVICE_STATE_INTERNAL_ERROR;
-       mlx4_err(dev, "device was reset successfully\n");
        mutex_unlock(&persist->device_state_mutex);
 
        /* At that step HW was already reset, now notify clients */