linux-kernel - Re: [PATCH v6 1/9] PCI/ERR: Update error status after reset

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Date:   Thu, 15 Aug 2019 15:52:13 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com, keith.busch@...el.com
Subject: Re: [PATCH v6 1/9] PCI/ERR: Update error status after reset_link()

Hi,

On 8/15/19 3:16 PM, Bjorn Helgaas wrote:
> On Fri, Jul 26, 2019 at 02:43:11PM -0700, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>>
>> Commit bdb5ac85777d ("PCI/ERR: Handle fatal error recovery") uses
>> reset_link() to recover from fatal errors. But, if the reset is
>> successful there is no need to continue the rest of the error recovery
>> checks. Also, during fatal error recovery, if the initial value of error
>> status is PCI_ERS_RESULT_DISCONNECT or PCI_ERS_RESULT_NO_AER_DRIVER then
>> even after successful recovery (using reset_link()) pcie_do_recovery()
>> will report the recovery result as failure. So update the status of
>> error after reset_link().
>>
>> Fixes: bdb5ac85777d ("PCI/ERR: Handle fatal error recovery")
>> Cc: Ashok Raj <ashok.raj@...el.com>
>> Cc: Keith Busch <keith.busch@...el.com>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>> ---
>>   drivers/pci/pcie/err.c | 11 ++++++++---
>>   1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
>> index 773197a12568..aecec124a829 100644
>> --- a/drivers/pci/pcie/err.c
>> +++ b/drivers/pci/pcie/err.c
>> @@ -204,9 +204,13 @@ void pcie_do_recovery(struct pci_dev *dev, enum pci_channel_state state,
>>   	else
>>   		pci_walk_bus(bus, report_normal_detected, &status);
>>   
>> -	if (state == pci_channel_io_frozen &&
>> -	    reset_link(dev, service) != PCI_ERS_RESULT_RECOVERED)
>> -		goto failed;
>> +	if (state == pci_channel_io_frozen) {
>> +		status = reset_link(dev, service);
>> +		if (status != PCI_ERS_RESULT_RECOVERED)
>> +			goto failed;
>> +		else
>> +			goto done;
> This will be easier to read without the negation, i.e.,
>
>                  if (status == PCI_ERS_RESULT_RECOVERED)
>                          goto done;
>                  else
>                          goto failed;
will change it in next version.

-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer