linux-kernel - Re: [PATCH] toshiba-wmi: Fix loading the driver on non Toshiba laptops

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Date:   Sun, 28 Aug 2016 10:00:37 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Azael Avalos <coproscefalo@...il.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        carlos@...angeworlds.co.uk
Subject: Re: [PATCH] toshiba-wmi: Fix loading the driver on non Toshiba
 laptops

On Thu, Aug 25, 2016 at 12:50:55PM -0600, Azael Avalos wrote:
> Bug 150611 uncovered that the WMI ID used by the toshiba-wmi driver
> is not Toshiba specific, and as such, the driver was being loaded
> on non Toshiba laptops too.
> 
> This patch adds a DMI matching list checking for TOSHIBA as the
> vendor, refusing to load if it is not.
> 
> Also the WMI GUID was renamed, dropping the TOSHIBA_ prefix, to
> better reflect that such GUID is not a Toshiba specific one.
> 
> Cc: <stable@...r.kernel.org> # 4.4+
> Signed-off-by: Azael Avalos <coproscefalo@...il.com>
> ---
> Hi Darren,
> 
> I was waiting on input from the bug above, but haven't received an
> answer (as of yet), so I decided to send this to the mailing list
> for feedback as to whether this is the correct approach for this
> issue.

Thanks. Let's see if Carlos (wmi.c author) has an opinion...

Carlos?

> 
>  drivers/platform/x86/toshiba-wmi.c | 26 +++++++++++++++++++-------
>  1 file changed, 19 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/platform/x86/toshiba-wmi.c b/drivers/platform/x86/toshiba-wmi.c
> index feac457..0c92887 100644
> --- a/drivers/platform/x86/toshiba-wmi.c
> +++ b/drivers/platform/x86/toshiba-wmi.c
> @@ -24,14 +24,15 @@
>  #include <linux/acpi.h>
>  #include <linux/input.h>
>  #include <linux/input/sparse-keymap.h>
> +#include <linux/dmi.h>
>  
>  MODULE_AUTHOR("Azael Avalos");
>  MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
>  MODULE_LICENSE("GPL");
>  
> -#define TOSHIBA_WMI_EVENT_GUID	"59142400-C6A3-40FA-BADB-8A2652834100"
> +#define WMI_EVENT_GUID	"59142400-C6A3-40FA-BADB-8A2652834100"
>  
> -MODULE_ALIAS("wmi:"TOSHIBA_WMI_EVENT_GUID);
> +MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
>  
>  static struct input_dev *toshiba_wmi_input_dev;
>  
> @@ -63,6 +64,16 @@ static void toshiba_wmi_notify(u32 value, void *context)
>  	kfree(response.pointer);
>  }
>  
> +static struct dmi_system_id toshiba_wmi_dmi_table[] __initdata = {
> +	{
> +		.ident = "Toshiba laptop",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
> +		},
> +	},
> +	{}
> +};
> +
>  static int __init toshiba_wmi_input_setup(void)
>  {
>  	acpi_status status;
> @@ -81,7 +92,7 @@ static int __init toshiba_wmi_input_setup(void)
>  	if (err)
>  		goto err_free_dev;
>  
> -	status = wmi_install_notify_handler(TOSHIBA_WMI_EVENT_GUID,
> +	status = wmi_install_notify_handler(WMI_EVENT_GUID,
>  					    toshiba_wmi_notify, NULL);
>  	if (ACPI_FAILURE(status)) {
>  		err = -EIO;
> @@ -95,7 +106,7 @@ static int __init toshiba_wmi_input_setup(void)
>  	return 0;
>  
>   err_remove_notifier:
> -	wmi_remove_notify_handler(TOSHIBA_WMI_EVENT_GUID);
> +	wmi_remove_notify_handler(WMI_EVENT_GUID);
>   err_free_keymap:
>  	sparse_keymap_free(toshiba_wmi_input_dev);
>   err_free_dev:
> @@ -105,7 +116,7 @@ static int __init toshiba_wmi_input_setup(void)
>  
>  static void toshiba_wmi_input_destroy(void)
>  {
> -	wmi_remove_notify_handler(TOSHIBA_WMI_EVENT_GUID);
> +	wmi_remove_notify_handler(WMI_EVENT_GUID);
>  	sparse_keymap_free(toshiba_wmi_input_dev);
>  	input_unregister_device(toshiba_wmi_input_dev);
>  }
> @@ -114,7 +125,8 @@ static int __init toshiba_wmi_init(void)
>  {
>  	int ret;
>  
> -	if (!wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
> +	if (!wmi_has_guid(WMI_EVENT_GUID) ||
> +	    !dmi_check_system(toshiba_wmi_dmi_table))
>  		return -ENODEV;
>  
>  	ret = toshiba_wmi_input_setup();
> @@ -130,7 +142,7 @@ static int __init toshiba_wmi_init(void)
>  
>  static void __exit toshiba_wmi_exit(void)
>  {
> -	if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
> +	if (wmi_has_guid(WMI_EVENT_GUID))
>  		toshiba_wmi_input_destroy();
>  }
>  
> -- 
> 2.9.3
> 
> 

-- 
Darren Hart
Intel Open Source Technology Center