Re: PCI PM: Restore standard config registers of all devices early

[Ingo Molnar]

* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:

> On Tue, 2009-02-03 at 06:06 +0100, Ingo Molnar wrote:
> > 
> > Mutexes should work just fine in irqs-off sections - they'll safely 
> > save/restore interrupts, even the debug variants.
> 
> mutex_lock() has might_sleep() which will generate a splat in atomic
> contexts.
> 
> That said, afaik the acpi code uses semaphores.

even the might_sleep() should be OK with Linus's system_state change to the 
suspend code:

void __might_sleep(char *file, int line)
{
#ifdef in_atomic
        static unsigned long prev_jiffy;        /* ratelimiting */

        if ((!in_atomic() && !irqs_disabled()) ||
                    system_state != SYSTEM_RUNNING || oops_in_progress)

	Ingo
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