linux-kernel - Re: [PATCH 17/24] usb: host: xhci: Remove unused variable 'len'

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Date:   Thu, 27 May 2021 09:16:09 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 17/24] usb: host: xhci: Remove unused variable 'len'

On Thu, 27 May 2021, Greg Kroah-Hartman wrote:

> On Wed, May 26, 2021 at 02:00:30PM +0100, Lee Jones wrote:
> > Fixes the following W=1 kernel build warning(s):
> > 
> >  drivers/usb/host/xhci.c: In function ‘xhci_unmap_temp_buf’:
> >  drivers/usb/host/xhci.c:1349:15: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
> > 
> > Cc: Mathias Nyman <mathias.nyman@...el.com>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: linux-usb@...r.kernel.org
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/usb/host/xhci.c | 9 ++++-----
> >  1 file changed, 4 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index 27283654ca080..ac2a7d4288883 100644
> > --- a/drivers/usb/host/xhci.c
> > +++ b/drivers/usb/host/xhci.c
> > @@ -1346,7 +1346,6 @@ static bool xhci_urb_temp_buffer_required(struct usb_hcd *hcd,
> >  
> >  static void xhci_unmap_temp_buf(struct usb_hcd *hcd, struct urb *urb)
> >  {
> > -	unsigned int len;
> >  	unsigned int buf_len;
> >  	enum dma_data_direction dir;
> >  
> > @@ -1362,10 +1361,10 @@ static void xhci_unmap_temp_buf(struct usb_hcd *hcd, struct urb *urb)
> >  				 dir);
> >  
> >  	if (usb_urb_dir_in(urb))
> > -		len = sg_pcopy_from_buffer(urb->sg, urb->num_sgs,
> > -					   urb->transfer_buffer,
> > -					   buf_len,
> > -					   0);
> > +		sg_pcopy_from_buffer(urb->sg, urb->num_sgs,
> > +				     urb->transfer_buffer,
> > +				     buf_len,
> > +				     0);
> 
> Sorry, but no, I keep rejecting this over and over, it needs to handle
> the error handling properly and not paper over it like this :(

Will fix.

> All the bots keep tripping up on it, you are not alone.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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