linux-kernel - Re: [PATCH RESEND v3 3/3] platform/x86: dell-laptop: Do not fail when encountering unsupported batteries

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Message-ID: <9cfb6e26-e3d1-403a-a894-4a0902905407@redhat.com>
Date: Sun, 6 Oct 2024 12:31:34 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Armin Wolf <W_Armin@....de>, pali@...nel.org, dilinger@...ued.net
Cc: rafael@...nel.org, lenb@...nel.org, ilpo.jarvinen@...ux.intel.com,
 platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v3 3/3] platform/x86: dell-laptop: Do not fail when
 encountering unsupported batteries

Hi,

On 1-Oct-24 11:28 PM, Armin Wolf wrote:
> If the battery hook encounters a unsupported battery, it will
> return an error. This in turn will cause the battery driver to
> automatically unregister the battery hook.
> 
> On machines with multiple batteries however, this will prevent
> the battery hook from handling the primary battery, since it will
> always get unregistered upon encountering one of the unsupported
> batteries.
> 
> Fix this by simply ignoring unsupported batteries.
> 
> Reviewed-by: Pali Rohár <pali@...nel.org>
> Fixes: ab58016c68cc ("platform/x86:dell-laptop: Add knobs to change battery charge settings")
> Signed-off-by: Armin Wolf <W_Armin@....de>

Thank you for your patch/series, I've applied this patch
(series) to my review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in the pdx86 review-hans branch once I've
pushed my local branch there, which might take a while.

I will include this patch in my next fixes pull-req to Linus
for the current kernel development cycle.

Regards,

Hans



> ---
>  drivers/platform/x86/dell/dell-laptop.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
> index a3cd0505f282..5671bd0deee7 100644
> --- a/drivers/platform/x86/dell/dell-laptop.c
> +++ b/drivers/platform/x86/dell/dell-laptop.c
> @@ -2391,12 +2391,18 @@ static struct attribute *dell_battery_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(dell_battery);
> 
> +static bool dell_battery_supported(struct power_supply *battery)
> +{
> +	/* We currently only support the primary battery */
> +	return strcmp(battery->desc->name, "BAT0") == 0;
> +}
> +
>  static int dell_battery_add(struct power_supply *battery,
>  		struct acpi_battery_hook *hook)
>  {
> -	/* this currently only supports the primary battery */
> -	if (strcmp(battery->desc->name, "BAT0") != 0)
> -		return -ENODEV;
> +	/* Return 0 instead of an error to avoid being unloaded */
> +	if (!dell_battery_supported(battery))
> +		return 0;
> 
>  	return device_add_groups(&battery->dev, dell_battery_groups);
>  }
> @@ -2404,6 +2410,9 @@ static int dell_battery_add(struct power_supply *battery,
>  static int dell_battery_remove(struct power_supply *battery,
>  		struct acpi_battery_hook *hook)
>  {
> +	if (!dell_battery_supported(battery))
> +		return 0;
> +
>  	device_remove_groups(&battery->dev, dell_battery_groups);
>  	return 0;
>  }
> --
> 2.39.5
> 
>