> And there is of course the puzzle of why there exists simultaneously > driver shutdown() and suspend(PMSG_FREEZE) methods as I believed they > are defined to do exactly the same thing. No puzzle; that's not how they're defined. Both of them cause the device to quiesce that device's activity. But: - shutdown() is a "dirty shutdown OK" heads-up for some level of restart/reboot; hardware will be completely re-initialized later, normally with hardware level resets and OS rebooting. - freeze() is a "clean shutdown only" that normally sees hardware state preserved, and is followed by suspend() or resume(). Or so I had understood. That does suggest why having FREEZE in the reboot path could be trouble: you could be rebooting because that hardware won't do a clean shutdown! - Dave
