Re: [PATCH] PCI / PM: Do not clear state_saved for devices that remain suspended

[Rafael J. Wysocki]

On Wed, May 23, 2018 at 12:01 AM, Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
> On Fri, May 18, 2018 at 10:17:42AM +0200, Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>>
>> The state_saved flag should not be cleared in pci_pm_suspend() if the
>> given device is going to remain suspended, or the device's config
>> space will not be restored properly during the subsequent resume.
>>
>> Namely, if the device is going to stay in suspend, both the late
>> and noirq callbacks return early for it, so if its state_saved flag
>> is cleared in pci_pm_suspend(), it will remain unset throughout the
>> remaining part of suspend and resume and pci_restore_state() called
>> for the device going forward will return without doing anything.
>>
>> For this reason, change pci_pm_suspend() to only clear state_saved
>> if the given device is not going to remain suspended.  [This is
>> analogous to what commit ae860a19f37c (PCI / PM: Do not clear
>> state_saved in pci_pm_freeze() when smart suspend is set) did for
>> hibernation.]
>>
>> Fixes: c4b65157aeef (PCI / PM: Take SMART_SUSPEND driver flag into account)
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>
> I assume you'll take this one, too.

Yes, I will, thank you!