netdev - Re: [PATCH] net/mlx4: Fix EEH recovery failure

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Date:	Mon, 24 Nov 2014 23:17:55 +0200
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>,
	Amir Vadai <amirv@...lanox.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH] net/mlx4: Fix EEH recovery failure

On Sat, Nov 22, 2014 at 12:56 PM, Gavin Shan <gwshan@...ux.vnet.ibm.com> wrote:
> The patch fixes couple of EEH recovery failures on PPC PowerNV
> platform:

>    * Don't clear struct mlx4_priv instance in mlx4_pci_err_detected().
>      Otherwise, __mlx4_init_one() runs into kernel crash because
>      of dereferencing to NULL pointer.

I don't see this change in the patch, I see no-clearing of mlx4_priv
in __mlx4_unload_one - please clarify, also is this patch
based/targeted on the net or net-next tree?



> With the patch applied, EEH recovery for mlx4 adapter succeeds on PPC
> PowerNV platform.
>
>    # lspci
>    0003:0f:00.0 Network controller: Mellanox Technologies \
>    MT27500 Family [ConnectX-3]
>
> Signed-off-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index 90de6e1..e118ac9 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -2809,7 +2809,6 @@ static void mlx4_unload_one(struct pci_dev *pdev)
>         kfree(dev->caps.qp1_proxy);
>         kfree(dev->dev_vfs);
>
> -       memset(priv, 0, sizeof(*priv));
>         priv->pci_dev_data = pci_dev_data;
>         priv->removed = 1;
>  }
> @@ -2900,6 +2899,8 @@ static pci_ers_result_t mlx4_pci_err_detected(struct pci_dev *pdev,
>                                               pci_channel_state_t state)
>  {
>         mlx4_unload_one(pdev);
> +       pci_release_regions(pdev);
> +       pci_disable_device(pdev);
>
>         return state == pci_channel_io_perm_failure ?
>                 PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
> --
> 1.8.3.2
>
> --
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