linux-kernel - Re: [Bug #13663] suspend to ram regression (IDE related)

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Date:	Wed, 01 Jul 2009 22:47:41 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Etienne Basset <etienne.basset@...ericable.fr>,
	David Miller <davem@...emloft.net>, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	bzolnier@...il.com, Ralf Baechle <ralf@...ux-mips.org>,
	linux-mips@...ux-mips.org, linux-ide@...r.kernel.org
Subject: Re: [Bug #13663] suspend to ram regression (IDE related)

On Wed, 2009-07-01 at 22:31 +0800, Jeff Chua wrote:
> On Tue, Jun 30, 2009 at 12:21 AM, Jeff Chua<jeff.chua.linux@...il.com> wrote:
> 
> > I just tried, and it "seems" to work. Will try a few more cycles.
> 
> STD/STR survived quite a few cycles now. Patch seems to be doing the
> right thing.
> 
> On Mon, Jun 29, 2009 at 11:51 PM, Etienne
> Basset<etienne.basset@...ericable.fr> wrote:
> 
> > To have STR/resume work with current git, I have to :
> 
> > 1) apply Bart's patch
> 
> This is not yet in Linus's tree. And much needed to really fix the problem.
> 
> > 2) revert this commit : a1317f714af7aed60ddc182d0122477cbe36ee9b
> 

Yes, This commit must be reverted, otherwise, STD/Hibernation will not
work either. I have tested it on two different loongson-based machines:
fuloong2e box and yeeloong2f netbook.(loongson is mips compatiable)

Here is what i have traced:

        hibernate(kernel/power/hibernate.c)
        --> hibernation_snapshot
        --> dpm_resume_end
        --> dpm_resume
        --> device_resume
        --> dev->bus->resume(generic_ide_resume), dev_name(dev) = 0.0
        --> blk_execute_rq
        {
                DECLARE_COMPLETION_ONSTACK(wait);
                ...
                wait_for_completion(&wait);     // stop here
                ...
        }

and I have tried to revert this part of the above patch:

-
-               WARN_ON_ONCE(hwif->rq);
 repeat:
                prev_port = hwif->host->cur_port;
+
+               if (drive->dev_flags & IDE_DFLAG_BLOCKED)
+                       rq = hwif->rq;
+               else
+                       WARN_ON_ONCE(hwif->rq);
+

it works! need more time to test!

thanks!
Wu Zhangjin

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