linux-kernel - Re: [PATCH] platform/x86: wmi: Initialize ACPI device class

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Message-ID: <9ccc3b9d-d71a-451c-80f5-3da62108d983@redhat.com>
Date: Mon, 29 Jan 2024 13:51:26 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Armin Wolf <W_Armin@....de>, ilpo.jarvinen@...ux.intel.com,
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: wmi: Initialize ACPI device class

Hi,

On 1/24/24 20:07, Armin Wolf wrote:
> When an ACPI netlink event is received by acpid, the ACPI device
> class is passed as its first argument. But since the class string
> is not initialized, an empty string is being passed:
> 
> 	netlink:  PNP0C14:01 000000d0 00000000
> 
> Fix this by initializing the ACPI device class during probe.
> 
> Signed-off-by: Armin Wolf <W_Armin@....de>
> ---
> Note: This patch is based on commit 3f399b5d7189 ("platform/x86: wmi: Use ACPI device name in netlink event")
> ---
>  drivers/platform/x86/wmi.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
> index 7ef1e82dc61c..b92425c30a50 100644
> --- a/drivers/platform/x86/wmi.c
> +++ b/drivers/platform/x86/wmi.c
> @@ -32,6 +32,8 @@
>  #include <linux/wmi.h>
>  #include <linux/fs.h>
> 
> +#define ACPI_WMI_DEVICE_CLASS	"wmi"
> +
>  MODULE_AUTHOR("Carlos Corbacho");
>  MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
>  MODULE_LICENSE("GPL");
> @@ -1202,7 +1204,7 @@ static int wmi_notify_device(struct device *dev, void *data)
>  		wblock->handler(*event, wblock->handler_data);
>  	}
> 
> -	acpi_bus_generate_netlink_event(wblock->acpi_device->pnp.device_class,
> +	acpi_bus_generate_netlink_event(acpi_device_class(wblock->acpi_device),
>  					acpi_dev_name(wblock->acpi_device), *event, 0);
> 
>  	return -EBUSY;
> @@ -1267,6 +1269,8 @@ static int acpi_wmi_probe(struct platform_device *device)
>  		return -ENODEV;
>  	}
> 
> +	strscpy(acpi_device_class(acpi_device), ACPI_WMI_DEVICE_CLASS, sizeof(acpi_device_class));
> +

Hmm, I'm not sure if you are supposed to do this when you are not an
acpi_driver's add() function.

Rafael, do you have any comments on this ?

Regards,

Hans





>  	wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0), NULL, "wmi_bus-%s",
>  				    dev_name(&device->dev));
>  	if (IS_ERR(wmi_bus_dev))
> --
> 2.39.2
>