Re: [PATCH] PCI/AER: Iterate over error counters instead of error strings

[Mohamed Khalfella <mkhalfella@purestorage.com>]

On 2022-07-11 17:54:37 -0500, Bjorn Helgaas wrote:
> On Mon, May 09, 2022 at 06:14:41PM +0000, Mohamed Khalfella wrote:
> > PCI AER stats counters sysfs attributes need to iterate over
> > stats counters instead of stats names. Also, added a build
> > time check to make sure all counters have entries in strings
> > array.
> > 
> > Fixes: 0678e3109a3c ("PCI/AER: Simplify __aer_print_error()")
> > Cc: stable@vger.kernel.org
> > Reported-by: Meeta Saggi <msaggi@purestorage.com>
> > Signed-off-by: Mohamed Khalfella <mkhalfella@purestorage.com>
> > Reviewed-by: Meeta Saggi <msaggi@purestorage.com>
> > Reviewed-by: Eric Badger <ebadger@purestorage.com>
> 
> I added some info about why we need this to the commit log and applied
> to pci/err for v5.20.  Thank you!
That is good news! Thank you for helping out.
> 
> > ---
> >  drivers/pci/pcie/aer.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> > index 9fa1f97e5b27..ce99a6d44786 100644
> > --- a/drivers/pci/pcie/aer.c
> > +++ b/drivers/pci/pcie/aer.c
> > @@ -533,7 +533,7 @@ static const char *aer_agent_string[] = {
> >  	u64 *stats = pdev->aer_stats->stats_array;			\
> >  	size_t len = 0;							\
> >  									\
> > -	for (i = 0; i < ARRAY_SIZE(strings_array); i++) {		\
> > +	for (i = 0; i < ARRAY_SIZE(pdev->aer_stats->stats_array); i++) {\
> >  		if (strings_array[i])					\
> >  			len += sysfs_emit_at(buf, len, "%s %llu\n",	\
> >  					     strings_array[i],		\
> > @@ -1342,6 +1342,11 @@ static int aer_probe(struct pcie_device *dev)
> >  	struct device *device = &dev->device;
> >  	struct pci_dev *port = dev->port;
> >  
> > +	BUILD_BUG_ON(ARRAY_SIZE(aer_correctable_error_string) <
> > +		     AER_MAX_TYPEOF_COR_ERRS);
> > +	BUILD_BUG_ON(ARRAY_SIZE(aer_uncorrectable_error_string) <
> > +		     AER_MAX_TYPEOF_UNCOR_ERRS);
> > +
> >  	/* Limit to Root Ports or Root Complex Event Collectors */
> >  	if ((pci_pcie_type(port) != PCI_EXP_TYPE_RC_EC) &&
> >  	    (pci_pcie_type(port) != PCI_EXP_TYPE_ROOT_PORT))
> > -- 
> > 2.29.0
> >