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 -- People were complaining that M$ turns users into beta-testers... ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!
