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media: uvcvideo: Do not return positive errors in uvc_query_ctrl()

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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.

This will avoid confusing the caller (and ultimately userspace) that
doesn't expect a positive or zero value.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Ricardo Ribalda 2023-01-03 15:36:22 +01:00 committed by Laurent Pinchart
parent 44cdba4130
commit a763b9fb58
1 changed files with 1 additions and 1 deletions
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2
drivers/media/usb/uvc/uvc_video.c
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@ -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. */