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SubjectRe: Network drivers that don't suspend on interface down
David Brownell wrote:
> Hmm, this reminds me of a thread from last summer, following up on
> some PM discussions at OLS. Thread "Runtime power management for
> network interfaces", at the end of July.
>
>
>
>> 2) Network device infrastructure should make it easier for devices:
>> bring interface down on suspend and bring it up after resume
>> (if it was running when suspended). This would allow many devices to
>> have no suspend/resume hook; except those that have some better power
>> control over hardware.
>>
>
> The _intent_ of the class suspend() and resume() methods is to let
> infrastructure (the network stack was explicitly mentioned!) handle
> pretty much everything except putting the hardware in low power
> modes ... which last step might, for PCI devices at least, most
> naturally be done in suspend_late(). That way it'd be decoupled
> cleanly from anything else.
>
The class methods don't work right for that because the physical class
(PCI) gets
called before the virtual class (network devices).

> Now, I recently tried refreshing a patch that used those class
> suspend() and resume() methods, and for some reason they're not
> getting called. I believe they used to get called, although it's
> true their parameter wasn't very useful ... it was called with the
> underlying device, not the class_device holding state that the
> class driver manages.
>
> I just wanted to point out that yes, this ground has been covered
> before, with some agreement on that approach. It'd be good to see
> it pursued. :)
>
> - Dave
>
>

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