Messages in this thread | | | Date | Thu, 29 Dec 2022 05:28:32 +0200 | From | Laurent Pinchart <> | Subject | Re: [PATCH RESEND v2 4/7] media: uvcvideo: Do not return positive errors in uvc_query_ctrl() |
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Hi Ricardo,
Thank you for the patch.
On Fri, Dec 02, 2022 at 06:21:38PM +0100, Ricardo Ribalda wrote: > If the returned size of the query does not match the expected size or it > is zero, return -EPIPE instead of 0 or a positive value.
The commit message should explain why: this will avoid confusing the caller (and ultimately userspace) that doesn't expect a positive or zero value.
> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
I'll update the commit message locally.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> --- > drivers/media/usb/uvc/uvc_video.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c > index 497073a50194..902f2817a743 100644 > --- a/drivers/media/usb/uvc/uvc_video.c > +++ b/drivers/media/usb/uvc/uvc_video.c > @@ -83,7 +83,7 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit, > dev_err(&dev->udev->dev, > "Failed to query (%s) UVC control %u on unit %u: %d (exp. %u).\n", > uvc_query_name(query), cs, unit, ret, size); > - return ret; > + return ret < 0 ? ret : -EPIPE; > } > > /* reuse data[0] to request the error code. */ >
-- Regards,
Laurent Pinchart
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