On 02/14/2017 09:44 PM, Raghava Aditya Renukunta wrote:
> This issue showed up on a kdump debug(single CPU on powerkvm), when EEH
> errors rendered the adapter unusable. The driver correctly detected the
> issue and attempted to restart the controller, in doing so the driver
> attempted to read the status registers of the controller. This triggered
> additional eeh errors which continued for a good 6 minutes.
>
> Fixed by returning without waiting when EEH error is reported.
>
> Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@xxxxxxxxxxxxx>
> Reviewed-by: David Carroll <David.Carroll@xxxxxxxxxxxxx>
> ---
> drivers/scsi/aacraid/commsup.c | 38 +++++++++++++++++++++++++++++++++++++-
> 1 file changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
> index 56090f5..6220b47 100644
> --- a/drivers/scsi/aacraid/commsup.c
> +++ b/drivers/scsi/aacraid/commsup.c
> @@ -461,6 +461,30 @@ int aac_queue_get(struct aac_dev * dev, u32 * index, u32 qid, struct hw_fib * hw
> return 0;
> }
Please do
> +#ifdef CONFIG_EEH
> +static inline int aac_check_eeh_failure(struct aac_dev *dev)
> +{
> + /* Check for an EEH failure for the given
> + * device node. Function eeh_dev_check_failure()
> + * returns 0 if there has not been an EEH error
> + * otherwise returns a non-zero value.
> + *
> + * Need to be called before any PCI operation,
> + * i.e.,before aac_adapter_check_health()
> + */
> + struct eeh_dev *edev = pci_dev_to_eeh_dev(dev->pdev);
> +
> + if (eeh_dev_check_failure(edev)) {
> + /* The EEH mechanisms will handle this
> + * error and reset the device if
> + * necessary.
> + */
> + return 1;
> + }
> + return 0;
> +}
#else
static inline int aac_check_eeh_failure(struct aac_dev *dev)
{
return 0;
}
> +#endif
> +
[...]
> +
> +#if defined(CONFIG_EEH)
> + if (aac_check_eeh_failure(dev))
> + return -EFAULT;
> +#endif
> +
So the #if defined() blocks become unnecessary.
Thanks,
Johannes
--
Johannes Thumshirn Storage
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