linux-kernel - Re: [PATCH 2/5] hwmon: (hp-wmi-sensors) Check if WMI event data exists

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Message-ID: <Zsgkw1kHz9TJx27g@equiv.tech>
Date: Thu, 22 Aug 2024 22:57:23 -0700
From: James Seo <james@...iv.tech>
To: Armin Wolf <W_Armin@....de>
Cc: jlee@...e.com, corentin.chary@...il.com, luke@...nes.dev,
	matan@...alib.org, coproscefalo@...il.com, hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com, rafael@...nel.org, lenb@...nel.org,
	platform-driver-x86@...r.kernel.org, linux-hwmon@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] hwmon: (hp-wmi-sensors) Check if WMI event data
 exists

On Thu, Aug 22, 2024 at 07:38:07PM +0200, Armin Wolf wrote:
> The BIOS can choose to return no event data in response to a
> WMI event, so the ACPI object passed to the WMI notify handler
> can be NULL.
> 
> Check for such a situation and ignore the event in such a case.
> 
> Signed-off-by: Armin Wolf <W_Armin@....de>
> ---
>  drivers/hwmon/hp-wmi-sensors.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/hwmon/hp-wmi-sensors.c b/drivers/hwmon/hp-wmi-sensors.c
> index 6892518d537c..d6bdad26feb1 100644
> --- a/drivers/hwmon/hp-wmi-sensors.c
> +++ b/drivers/hwmon/hp-wmi-sensors.c
> @@ -1628,6 +1628,9 @@ static void hp_wmi_notify(union acpi_object *wobj, void *context)
>  	 * HPBIOS_BIOSEvent instance.
>  	 */
> 
> +	if (!wobj)
> +		return;
> +
>  	mutex_lock(&state->lock);
> 
>  	err = populate_event_from_wobj(dev, &event, wobj);
> --
> 2.39.2
> 

Reviewed-by: James Seo <james@...iv.tech>

That also goes for the portion of the previous patch in
this series dealing exclusively with hp-wmi-sensors.