linux-kernel - Re: [PATCH v2 2/5] watchdog: hpwdt: Claim NMI from iLO

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Date:   Tue, 14 Aug 2018 06:30:58 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jerry Hoemann <jerry.hoemann@....com>, wim@...ux-watchdog.org
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] watchdog: hpwdt: Claim NMI from iLO

On 08/08/2018 12:13 PM, Jerry Hoemann wrote:
> The hwpdt driver is overloaded for handling both the iLO
> watchdog and the explicit "Generate NMI to System" virutal
> button.  Hence NMI handler needs to claim NMI resulting
> from the virutal button.
> 
> Claim if iLO generated accommodating firmware that might
> set wrong bit.
> 
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   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 fae9364..bb41714 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)
>   		return NMI_DONE;
>   
>   	hpwdt_stop();
>