Re: comments on irc log

[Pavel Machek <pavel-AlSwsSmVLrQ@public.gmane.org>]

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Hi!

> > Usually very fast.  Unfortunately for some kinds of USB host controllers 
> > it can be relatively slow, since quiescing the controller has an 
> > unavoidable side effect of suspending all devices on the bus.
> 
> I wonder if we need to quiesce the controller in fact for FREEZE.
> Probably not. Just stop all queue processing and refuse URBs. The hcca
> will still get updated, but who cares ? it will end up beeing saved in
> an inconsistent state in the suspend image, so what ? On resume, we will
> have rebooted, we can "clean it up".
> 
> This is sort-of breaking the rule of "no DMA", and thus is not suitable
> for kexec (which is ok, kexec currently uses the separate "shutdown"
> callback which must switch DMA off), but would fix the problem for
> suspend to disk...

What problem? suspend seems to +/- work with suspend-to-disk just
now. I'd really hate to have to think about "some memory may change
behind my back" during suspend. I think "no DMA" is a good rule.
								Pavel
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