linux-kernel - Re: [PATCH -next] usb: xhci: remove unused variable

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Date:   Mon, 14 Dec 2020 13:05:22 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zou Wei <zou_wei@...wei.com>
Cc:     mathias.nyman@...el.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] usb: xhci: remove unused variable

On Mon, Dec 14, 2020 at 07:32:11PM +0800, Zou Wei wrote:
> Fix variable set but not used compilation warnings:
> 
> drivers/usb/host/xhci.c:1338:15: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
>   unsigned int len;
>                ^~~
> 
> Signed-off-by: Zou Wei <zou_wei@...wei.com>
> ---
>  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 91ab81c..24e5a0f 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -1335,7 +1335,6 @@ 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;
>  
> @@ -1351,10 +1350,10 @@ 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);

Why not test that this worked properly?

thanks,

greg k-h