Re: [PATCH] HID: wacom: stop hardware after post-start probe failures

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Myeonghun,

On Mon, May 25, 2026 at 02:53:33AM +0900, Myeonghun Pak wrote:
> wacom_parse_and_register() starts HID hardware before registering inputs
> and initializing pad LEDs/remotes. Those later steps can fail, but their
> error paths currently release Wacom resources without stopping the HID
> hardware.
> 
> Route post-hid_hw_start() failures through hid_hw_stop() before
> releasing driver resources.
> 
> This issue was identified during our ongoing static-analysis research while
> reviewing kernel code.
> 
> Fixes: c1d6708bf0d3 ("HID: wacom: Do not register input devices until after hid_hw_start")
> Cc: stable@vger.kernel.org
> Co-developed-by: Ijae Kim <ae878000@gmail.com>
> Signed-off-by: Ijae Kim <ae878000@gmail.com>
> Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
> ---
>  drivers/hid/wacom_sys.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
> index 0d1c6d90fe..c824d9c224 100644
> --- a/drivers/hid/wacom_sys.c
> +++ b/drivers/hid/wacom_sys.c
> @@ -2456,16 +2456,16 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
>  
>  	error = wacom_register_inputs(wacom);
>  	if (error)
> -		goto fail;
> +		goto fail_hw_stop;
>  
>  	if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
>  		error = wacom_initialize_leds(wacom);
>  		if (error)
> -			goto fail;
> +			goto fail_hw_stop;
>  
>  		error = wacom_initialize_remotes(wacom);
>  		if (error)
> -			goto fail;
> +			goto fail_hw_stop;
>  	}
>  
>  	if (!wireless) {
> @@ -2496,6 +2496,7 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
>  	return 0;
>  
>  fail_quirks:
> +fail_hw_stop:
>  	hid_hw_stop(hdev);
>  fail:
>  	wacom_release_resources(wacom);

I'd get rid of 'fail_quirks' and use 'fail_hw_stop' everywhere,
otherwise:

Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Thanks.

-- 
Dmitry