[PATCH] net/mlx4: Support shutdown() interface

[PATCH] net/mlx4: Support shutdown() interface

[Gavin Shan]

In kexec scenario, we failed to load the mlx4 driver in the
second kernel because the ownership bit was hold by the first
kernel without release correctly.

The patch adds shutdown() interface so that the ownership can
be released correctly in the first kernel. It also helps avoiding
EEH error happened during boot stage of the second kernel because
of undesired traffic, which can't be handled by hardware during
that stage on Power platform.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Tested-by: Wei Yang <weiyang@linux.vnet.ibm.com>
---
 drivers/net/ethernet/mellanox/mlx4/main.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index d711158..5a6105f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -2684,6 +2684,7 @@ static struct pci_driver mlx4_driver = {
 	.name		= DRV_NAME,
 	.id_table	= mlx4_pci_table,
 	.probe		= mlx4_init_one,
+	.shutdown	= mlx4_remove_one,
 	.remove		= mlx4_remove_one,
 	.err_handler    = &mlx4_err_handler,
 };
-- 
1.7.10.4

Re: [PATCH] net/mlx4: Support shutdown() interface

[David Miller]

From: Gavin Shan <shangw@linux.vnet.ibm.com>
Date: Tue,  4 Mar 2014 15:35:20 +0800

> In kexec scenario, we failed to load the mlx4 driver in the
> second kernel because the ownership bit was hold by the first
> kernel without release correctly.
> 
> The patch adds shutdown() interface so that the ownership can
> be released correctly in the first kernel. It also helps avoiding
> EEH error happened during boot stage of the second kernel because
> of undesired traffic, which can't be handled by hardware during
> that stage on Power platform.
> 
> Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
> Tested-by: Wei Yang <weiyang@linux.vnet.ibm.com>

Applied.