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

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Date:	Tue, 25 Nov 2014 08:55:55 +1100
From:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	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 Mon, Nov 24, 2014 at 11:17:55PM +0200, Or Gerlitz wrote:
>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?
>

Yes, It would be: Don't clear struct mlx4_priv instance in mlx4_unload_one(),
which is called by mlx4_pci_err_detected().

It's based on 3.18.rc5, where I had couple of EEH fixes on top of it.
When testing EEH with it, I hit the issue.

Thanks,
Gavin

>
>
>> 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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>

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