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Subject: Re: [BUG] MIPS: Hibernation in the latest linux-mips:master branch
 not work
From:	Wu Zhangjin <wuzhangjin@gmail.com>
Reply-To: wuzhangjin@gmail.com
To:	Ralf Baechle <ralf@linux-mips.org>, linux-ide@vger.kernel.org
Cc:	LKML <linux-kernel@vger.kernel.org>, linux-mips@linux-mips.org,
	Pavel Machek <pavel@ucw.cz>
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	 <20090630144540.GA18212@linux-mips.org>
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Organization: DSLab, Lanzhou University, China
Date:	Wed, 01 Jul 2009 15:16:10 +0800
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On Tue, 2009-06-30 at 15:45 +0100, Ralf Baechle wrote:
> On Tue, Jun 30, 2009 at 10:41:08PM +0800, Wu Zhangjin wrote:
> 
> > I just updated my git repository to the master branch of the latest
> > linux-mips git repository, and tested the STD/Hibernation support on
> > fuloong2e and yeeloong2f, it failed:
> > 
> > when using the no_console_suspend kernel command line to debug, it
> > stopped on:
> > 
> > PM: Shringking memory... done (1000 pages freed)
> > PM: Freed 160000 kbytes in 1.68 seconds (95.23 MB/s)
> > PM: Creating hibernation image:
> > PM: Need to copy 5053 pages
> > PM: Hibernation image created (4195 pages copied)
> > 
> > and then, the number indicator light of keyboard works well, but can not
> > type anything. 
> > 
> > anybody have tested it on another platform? does it work?
> 
> At the time of the merge I tested it on Malta and found it to be working.
> 

Just traced it, the executing path is something like this:

	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
		...
	}

I guess there is a possible bug in the latest ide patches, I'm trying to
find which one is 'bad'.

the ide driver i used is VIA82CXXX chipset support.

Regards,
Wu Zhangjin