linux-kernel - Re: Linux v2.6.18-rc3

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Date:	Tue, 1 Aug 2006 21:59:19 -0700
From:	Andrew Morton <akpm@...l.org>
To:	"Jesse Brandeburg" <jesse.brandeburg@...il.com>
Cc:	stern@...land.harvard.edu, linux-kernel@...r.kernel.org,
	torvalds@...l.org, cpufreq@....linux.org.uk
Subject: Re: Linux v2.6.18-rc3

On Tue, 1 Aug 2006 21:31:22 -0700
"Jesse Brandeburg" <jesse.brandeburg@...il.com> wrote:

> On 7/31/06, Alan Stern <stern@...land.harvard.edu> wrote:
> > On Mon, 31 Jul 2006, Andrew Morton wrote:
> >
> > > core_initcall() would suit.  That's actually a bit late for this sort of
> > > thing, but we can always add a new section later if it becomes a problem.
> > > I'd suggest that we ensure that srcu_notifier_chain_register() performs a
> > > reliable BUG() if it gets called too early.
> >
> > Here's a patch to test.  I can't try it out on my machine because
> > 2.6.18-rc2-mm1 (even without the patch) crashes partway through a
> > suspend-to-disk, in a way that's extremely hard to debug.  Some sort of
> > spinlock-related bug occurs within ioapic_write_entry.
> 
> can't test because I also can't suspend or hibernate with rc2-mm1
> (resume causes hard hang with the backlight and screen off)  The issue
> i reported was against linus' 2.6.18-rc3 kernel.
> 

This might help?


author Jiri Slaby <ku@...lona.localdomain> Tue, 01 Aug 2006 01:16:13 +0159

--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -2360,6 +2360,7 @@ static int ioapic_resume(struct sys_devi
 		reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
 		io_apic_write(dev->id, 0, reg_00.raw);
 	}
+	spin_unlock_irqrestore(&ioapic_lock, flags);
 	for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
 		ioapic_write_entry(dev->id, i, entry[i]);
 
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