linux-kernel - Re: [PATCH][next][V2] media: uvcvideo: remove duplicated dma

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Date:   Thu, 11 Feb 2021 01:49:09 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Ricardo Ribalda <ribalda@...omium.org>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH][next][V2] media: uvcvideo: remove duplicated dma_dev
 assignments

Hi Colin,

(CC'ing Christoph)

Thank you for the patch.

On Wed, Feb 10, 2021 at 07:19:42PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The assignment to dma_dev has been performed twice in one
> statement. Fix this by removing the extraneous assignment.
> 
> Addresses-Coverity: ("Evaluation order violation")
> Fixes: fdcd02a641e2 ("media: uvcvideo: Use dma_alloc_noncontiguos API")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

The fix looks good to me,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

As I wasn't CC'ed on the offending patch, and given that it didn't get
merged through the linux-media tree and isn't in the linux-media master
branch, I'll let Ricardo and Christoph deal with the fallout for
linux-next.

> ---
> 
> V2:  Fix 2nd occurrence of this same issue.
> 
> ---
>  drivers/media/usb/uvc/uvc_video.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> index dc81f9a86eca..6f2f308d86fe 100644
> --- a/drivers/media/usb/uvc/uvc_video.c
> +++ b/drivers/media/usb/uvc/uvc_video.c
> @@ -1105,7 +1105,7 @@ static inline struct device *stream_to_dmadev(struct uvc_streaming *stream)
>  
>  static void uvc_urb_dma_sync(struct uvc_urb *uvc_urb, bool for_device)
>  {
> -	struct device *dma_dev = dma_dev = stream_to_dmadev(uvc_urb->stream);
> +	struct device *dma_dev = stream_to_dmadev(uvc_urb->stream);
>  
>  	if (for_device) {
>  		dma_sync_sgtable_for_device(dma_dev, uvc_urb->sgt,
> @@ -1586,7 +1586,7 @@ static void uvc_video_complete(struct urb *urb)
>   */
>  static void uvc_free_urb_buffers(struct uvc_streaming *stream)
>  {
> -	struct device *dma_dev = dma_dev = stream_to_dmadev(stream);
> +	struct device *dma_dev = stream_to_dmadev(stream);
>  	struct uvc_urb *uvc_urb;
>  
>  	for_each_uvc_urb(uvc_urb, stream) {

-- 
Regards,

Laurent Pinchart