linux-kernel - Re: [PATCH 2/4] watchdog: hpwdt: Claim NMI from iLO

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Date:   Wed, 8 Aug 2018 13:12:10 -0600
From:   Jerry Hoemann <jerry.hoemann@....com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     wim@...ux-watchdog.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] watchdog: hpwdt: Claim NMI from iLO

On Sat, Aug 04, 2018 at 06:09:05PM -0700, Guenter Roeck wrote:
> On 08/02/2018 02:15 PM, Jerry Hoemann wrote:
> > The hwpdt driver is overloaded for handling both the iLO
> > watchdog and the explicit "Generate NMI to System" virutal
> > button.
> > 
> > Claim the iLO NMI virtual button even if we are not claiming
> > the iLO watchdog pretimeout.
> > 
> > Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> 
> Guess you know what you are doing here.
> 
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Unfortunately the underlying documentation isn't publically available.
I am going loosen the check in version two, but current upstream
is definitely wrong for reasons above.

> 
> > ---
> >   drivers/watchdog/hpwdt.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
> > index 369022d..8a85ddd 100644
> > --- a/drivers/watchdog/hpwdt.c
> > +++ b/drivers/watchdog/hpwdt.c
> > @@ -162,7 +162,7 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
> >   	if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
> >   		return NMI_DONE;
> > -	if (ilo5 && !pretimeout)
> > +	if (ilo5 && !pretimeout && !(mynmi & 0x4))
> >   		return NMI_DONE;
> >   	hpwdt_stop();
> > 

-- 

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Jerry Hoemann                  Software Engineer   Hewlett Packard Enterprise
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