Re: [PATCH v6 1/9] PCI/ERR: Update error status after reset_link()

[Joe Perches <joe@perches.com>]

On Thu, 2019-08-15 at 17:16 -0500, Bjorn Helgaas wrote:
> On Fri, Jul 26, 2019 at 02:43:11PM -0700, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.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().
[]
> > diff --git 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;

bikeshed: I think it'd be easier to read without the else

		status = reset_link(dev, service);
		if (status != PCI_ERS_RESULT_RECOVERED)
			goto failed;

		goto done;