linux-kernel - Re: 2.6.22-rc4-mm2: Resume from RAM on HPC nx6325 broken

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Message-Id: <200706120020.51227.bzolnier@gmail.com>
Date:	Tue, 12 Jun 2007 00:20:51 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Lee Trager <lt73@...drexel.edu>
Subject: Re: 2.6.22-rc4-mm2: Resume from RAM on HPC nx6325 broken

On Monday 11 June 2007, Rafael J. Wysocki wrote:
> On Monday, 11 June 2007 22:03, Bartlomiej Zolnierkiewicz wrote:
> > 
> > Hi,
> > 
> > On Monday 11 June 2007, Rafael J. Wysocki wrote:
> > > Hi,
> > > 
> > > Here's the result of the search for the second patch that breaks resuming
> > > from RAM on HPC nx6325 (x86_64):
> > > 
> > > ide-ide-hpa-detect-from-resume.patch
> > > 
> > > The symptom is that after the resume there's no backlight and the screen
> > > apparently doesn't work, 100% of the time, although apart from this the system
> > > seems to be functional.
> > 
> > I find it hard to accept that IDE patch is to blame for that. ;)
> 
> But still (actually, I only don't know why it appeared to be functional :-)).

Yeah...

> > > The box doesn't even have an IDE HDD, but the DVD is handled by the atiixp
> > > driver.
> > 
> > If there are no IDE disks in the system there should be absolutely no
> > change in the functionality.
> 
> Sorry, but the patch is buggy.  Fix appended, details in the changelog.

Yep, I know already, our emails crossed each other :)

> Greetings,
> Rafael
> 
> 
> ---
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> generic_ide_resume() should check if dev->driver is not NULL before applying
> to_ide_driver() to it.  Fix that.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>

Thanks for fixing this.

> ---
>  drivers/ide/ide.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6.22-rc4/drivers/ide/ide.c
> ===================================================================
> --- linux-2.6.22-rc4.orig/drivers/ide/ide.c
> +++ linux-2.6.22-rc4/drivers/ide/ide.c
> @@ -1010,7 +1010,6 @@ static int generic_ide_resume(struct dev
>  {
>  	ide_drive_t *drive = dev->driver_data;
>  	ide_hwif_t *hwif = HWIF(drive);
> -	ide_driver_t *drv = to_ide_driver(dev->driver);
>  	struct request rq;
>  	struct request_pm_state rqpm;
>  	ide_task_t args;
> @@ -1033,8 +1032,12 @@ static int generic_ide_resume(struct dev
>  
>  	err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
>  
> -	if (err == 0 && drv && drv->resume)
> -		drv->resume(drive);
> +	if (err == 0 && dev->driver) {
> +		ide_driver_t *drv = to_ide_driver(dev->driver);
> +
> +		if (drv->resume)
> +			drv->resume(drive);
> +	}
>  
>  	return err;
>  }
-
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