linux-kernel - Re: [PATCH] hpwdt: Fix kdump issue in hpwdt

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Date:	Mon, 10 Sep 2012 12:48:11 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	thomas.mingarelli@...com, stable@...r.kernel.org,
	lisa.mitchell@...com
Subject: Re: [PATCH] hpwdt: Fix kdump issue in hpwdt

On Mon, 2012-09-10 at 20:48 +0200, Wim Van Sebroeck wrote:
> Hi Toshi,
> 
> > kdump can be interrupted by watchdog timer when the timer is left
> > activated on the crash kernel. Changed the hpwdt driver to disable
> > watchdog timer at boot-time. This assures that watchdog timer is
> > disabled until /dev/watchdog is opened, and prevents watchdog timer
> > to be left running on the crash kernel.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > Tested-by: Lisa Mitchell <lisa.mitchell@...com>
> > Cc: stable@...r.kernel.org 
> > ---
> >  drivers/watchdog/hpwdt.c |    3 +++
> >  1 files changed, 3 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
> > index 1eff743..ae60406 100644
> > --- a/drivers/watchdog/hpwdt.c
> > +++ b/drivers/watchdog/hpwdt.c
> > @@ -814,6 +814,9 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
> >  	hpwdt_timer_reg = pci_mem_addr + 0x70;
> >  	hpwdt_timer_con = pci_mem_addr + 0x72;
> >  
> > +	/* Make sure that timer is disabled until /dev/watchdog is opened */
> > +	hpwdt_stop();
> > +
> >  	/* Make sure that we have a valid soft_margin */
> >  	if (hpwdt_change_timer(soft_margin))
> >  		hpwdt_change_timer(DEFAULT_MARGIN);
> 
> Added to linux-watchdog-next .

Great!  Thanks Wim!
-Toshi


> 
> Kind regards,
> Wim.
> 


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