On Fri, 30 Oct 2015, Pavel Machek wrote: > > I would say instead "no I/O is allowed from now on". Maybe that's an > > overstatement, but I think it comes closer to the truth.
But that's what PM callbacks are for. > Exactly. And I'm pretty sure hardware drivers do use kernel threads, > and do I/O from them. > > LEDs are just one example And why is that relevant? First, I don't see any freezable kthread in leds class implementation whatsoever. Second, I am pretty sure that it's quite unlikely to participate in filesystem I/O. Sure, you need to suspend and resume the devices when going through suspend. That's why led_suspend() exists. How would try_to_freeze() help at all? That's basically just a fancy schedule() called at certain points. -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
