Re: 2.6.29-rc3: tg3 dead after resume

Benjamin Herrenschmidt
2009-02-07T03:27:41Z

On Sat, 2009-01-31 at 16:51 -0800, Linus Torvalds wrote:
>
> On Sat, 31 Jan 2009, Linus Torvalds wrote:
> >
> > For a USB host controller, for example, it really could make sense to do
> > that - just leave all the core host controller stuff running, and the only
> > thing the "suspend()" callback does is to send the commands to the actual
> > devices, it doesn't necessarily touch the host controller itself at all.
>
> Same is quite likely true of things like video graphics adapters. Again,
> for all the same reasons. Think about all those fbcon drivers. They will
> use DMA for things. And again, there are very compelling debugging reasons
> to not suspend them for real until suspend_late (if even then).

Actually, there are things like service processors etc... that only know
to communicate via DMA and little else via a little mailbox in some
reserved area of system memory...

Ben.