Re: [PATCH v7 3/5] PCI: pciehp: check and wait port status out of DPC before handling DLLSC and PDC

[Lukas Wunner]

On Sat, Oct 03, 2020 at 03:55:12AM -0400, Ethan Zhao wrote:
> When root port has DPC capability and it is enabled, then triggered by
> errors, DPC DLLSC and PDC etc interrupts will be sent to DPC driver, pciehp
> drivers almost at the same time.

Do the DLLSC and PDC events occur as a result of handling the error
or do they occur independently?

If the latter, I don't see how we can tell whether the card in the
slot is still the same.

If the former, holding the hotplug slot's reset_lock and doing something
along the lines of pciehp_reset_slot() (or calling it directly) might
solve the race.

Thanks,

Lukas