Re: [PATCH v3 4/9] scsi: lpfc: Change to use pci_aer_clear_uncorrect_error_status()

[Bjorn Helgaas <helgaas@kernel.org>]

[moved James, Dick, LPFC supporters to "to"]

On Wed, Sep 28, 2022 at 06:59:41PM +0800, Zhuo Chen wrote:
> lpfc_aer_cleanup_state() requires clearing both fatal and non-fatal
> uncorrectable error status.

I don't know what the point of lpfc_aer_cleanup_state() is.  AER
errors should be handled and cleared by the PCI core, not by
individual drivers.  Only lpfc, liquidio, and sky2 touch
PCI_ERR_UNCOR_STATUS.

But lpfc_aer_cleanup_state() is visible in the
"lpfc_aer_state_cleanup" sysfs file, so removing it would break any
userspace that uses it.

If we can rely on the PCI core to clean up AER errors itself
(admittedly, that might be a big "if"), maybe lpfc_aer_cleanup_state()
could just become a no-op?

Any comment from the LPFC folks?

Ideally, I would rather not export pci_aer_clear_nonfatal_status() or
pci_aer_clear_uncorrect_error_status() outside the PCI core at all.

> But using pci_aer_clear_nonfatal_status()
> will only clear non-fatal error status. To clear both fatal and
> non-fatal error status, use pci_aer_clear_uncorrect_error_status().
> 
> Signed-off-by: Zhuo Chen <chenzhuo.1@bytedance.com>
> ---
>  drivers/scsi/lpfc/lpfc_attr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
> index 09cf2cd0ae60..d835cc0ba153 100644
> --- a/drivers/scsi/lpfc/lpfc_attr.c
> +++ b/drivers/scsi/lpfc/lpfc_attr.c
> @@ -4689,7 +4689,7 @@ static DEVICE_ATTR_RW(lpfc_aer_support);
>   * Description:
>   * If the @buf contains 1 and the device currently has the AER support
>   * enabled, then invokes the kernel AER helper routine
> - * pci_aer_clear_nonfatal_status() to clean up the uncorrectable
> + * pci_aer_clear_uncorrect_error_status() to clean up the uncorrectable
>   * error status register.
>   *
>   * Notes:
> @@ -4715,7 +4715,7 @@ lpfc_aer_cleanup_state(struct device *dev, struct device_attribute *attr,
>  		return -EINVAL;
>  
>  	if (phba->hba_flag & HBA_AER_ENABLED)
> -		rc = pci_aer_clear_nonfatal_status(phba->pcidev);
> +		rc = pci_aer_clear_uncorrect_error_status(phba->pcidev);
>  
>  	if (rc == 0)
>  		return strlen(buf);
> -- 
> 2.30.1 (Apple Git-130)
>