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

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Date:   Thu, 19 Nov 2020 19:09:55 -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 Fri, Nov 13, 2020 at 07:56:31AM +0000, Lee Jones wrote:
> On Thu, 12 Nov 2020, Dmitry Torokhov wrote:
> 
> > 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.
> 
> Your call.  I'll do whatever you decide.

OK, please add error handling here.

Thank you.

-- 
Dmitry