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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 3 Feb 2009 13:09:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Andreas Schwab <schwab@...e.de>, Len Brown <lenb@...nel.org>
Subject: Re: PCI PM: Restore standard config registers of all devices early


* Peter Zijlstra <a.p.zijlstra@...llo.nl> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/