| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 058/312] net/mlx4_core: Do not BUG_ON during reset when PCI is offline | Date | Fri, 8 May 2020 14:30:49 +0200 |
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From: Daniel Jurgens <danielj@mellanox.com>
commit 22e3817e6c8301dc0520b855c8a2d764580e719c upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/net/ethernet/mellanox/mlx4/catas.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
--- 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_ 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 */
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