linux-kernel - Re: [PATCH] staging: vt6656: remove unused variable

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Message-ID: <20190516095035.GA1692@qd-ubuntu>
Date:   Thu, 16 May 2019 09:50:38 +0000
From:   Quentin Deslandes <quentin.deslandes@...ev.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        Forest Bond <forest@...ttletooquiet.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: vt6656: remove unused variable

On Thu, May 16, 2019 at 11:39:51AM +0200, Greg Kroah-Hartman wrote:
> On Thu, May 16, 2019 at 09:31:05AM +0000, Quentin Deslandes wrote:
> > Fixed 'set but not used' warning message on a status variable. The
> > called function returning the status code 'vnt_start_interrupt_urb()'
> > clean up after itself and the caller function
> > 'vnt_int_start_interrupt()' does not returns any value.
> > 
> > Signed-off-by: Quentin Deslandes <quentin.deslandes@...ev.co.uk>
> > ---
> >  drivers/staging/vt6656/int.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/staging/vt6656/int.c b/drivers/staging/vt6656/int.c
> > index 504424b19fcf..ac30ce72db5a 100644
> > --- a/drivers/staging/vt6656/int.c
> > +++ b/drivers/staging/vt6656/int.c
> > @@ -42,13 +42,12 @@ static const u8 fallback_rate1[5][5] = {
> >  void vnt_int_start_interrupt(struct vnt_private *priv)
> >  {
> >  	unsigned long flags;
> > -	int status;
> >  
> >  	dev_dbg(&priv->usb->dev, "---->Interrupt Polling Thread\n");
> >  
> >  	spin_lock_irqsave(&priv->lock, flags);
> >  
> > -	status = vnt_start_interrupt_urb(priv);
> > +	vnt_start_interrupt_urb(priv);
> 
> Shouldn't you fix this by erroring out if this fails?  Why ignore the
> errors?
> 
> thanks,
> 
> greg k-h

I could, however 'vnt_start_interrupt_urb()' already call 'dev_dbg()' if
it fails. Nothing is done after this debug call except returning an
error code.

'vnt_int_start_interrupt()' should, IMHO, return a status code, but the
original developer may have good reasons not to do so.

Thank you,
Quentin