linux-kernel - Re: [PATCH 07/15] input: touchscreen: usbtouchscreen: Remove unused variable 'ret'

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Message-ID: <20201113073655.GF356503@dtor-ws>
Date:   Thu, 12 Nov 2020 23:36:55 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org, Henrik Rydberg <rydberg@...math.org>,
        James Hilliard <james.hilliard1@...il.com>,
        Daniel Ritz <daniel.ritz@....ch>, linux-input@...r.kernel.org
Subject: Re: [PATCH 07/15] input: touchscreen: usbtouchscreen: Remove unused
 variable 'ret'

On Thu, Nov 12, 2020 at 11:01:56AM +0000, Lee Jones wrote:
> Fixes the following W=1 kernel build warning(s):
> 
>  drivers/input/touchscreen/usbtouchscreen.c: In function ‘nexio_read_data’:
>  drivers/input/touchscreen/usbtouchscreen.c:1052:50: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Henrik Rydberg <rydberg@...math.org>
> Cc: James Hilliard <james.hilliard1@...il.com>
> Cc: Daniel Ritz <daniel.ritz@....ch>
> Cc: linux-input@...r.kernel.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/input/touchscreen/usbtouchscreen.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
> index 397cb1d3f481b..c3b7130cd9033 100644
> --- a/drivers/input/touchscreen/usbtouchscreen.c
> +++ b/drivers/input/touchscreen/usbtouchscreen.c
> @@ -1049,7 +1049,7 @@ static int nexio_read_data(struct usbtouch_usb *usbtouch, unsigned char *pkt)
>  	unsigned int data_len = be16_to_cpu(packet->data_len);
>  	unsigned int x_len = be16_to_cpu(packet->x_len);
>  	unsigned int y_len = be16_to_cpu(packet->y_len);
> -	int x, y, begin_x, begin_y, end_x, end_y, w, h, ret;
> +	int x, y, begin_x, begin_y, end_x, end_y, w, h;
>  
>  	/* got touch data? */
>  	if ((pkt[0] & 0xe0) != 0xe0)
> @@ -1061,7 +1061,7 @@ static int nexio_read_data(struct usbtouch_usb *usbtouch, unsigned char *pkt)
>  		x_len -= 0x80;
>  
>  	/* send ACK */
> -	ret = usb_submit_urb(priv->ack, GFP_ATOMIC);
> +	usb_submit_urb(priv->ack, GFP_ATOMIC);

I wonder if we should handle potential errors instead.

>  
>  	if (!usbtouch->type->max_xc) {
>  		usbtouch->type->max_xc = 2 * x_len;
> -- 
> 2.25.1
> 

Thanks.

-- 
Dmitry