media: uvcvideo: Do not turn on the camera for some ioctls

There are some ioctls that do not need to turn on the camera. Do not
call uvc_pm_get in those cases.

Reviewed-by: Hans de Goede <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Ricardo Ribalda <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

Author: ribalda

drivers/media/usb/uvc/uvc_v4l2.c

@@ -1440,6 +1440,26 @@ static long uvc_v4l2_unlocked_ioctl(struct file *file,
 	struct uvc_fh *handle = file->private_data;
 	int ret;
 
+	/* The following IOCTLs do not need to turn on the camera. */
+	switch (cmd) {
+	case VIDIOC_CREATE_BUFS:
+	case VIDIOC_DQBUF:
+	case VIDIOC_ENUM_FMT:
+	case VIDIOC_ENUM_FRAMEINTERVALS:
+	case VIDIOC_ENUM_FRAMESIZES:
+	case VIDIOC_ENUMINPUT:
+	case VIDIOC_EXPBUF:
+	case VIDIOC_G_FMT:
+	case VIDIOC_G_PARM:
+	case VIDIOC_G_SELECTION:
+	case VIDIOC_QBUF:
+	case VIDIOC_QUERYCAP:
+	case VIDIOC_REQBUFS:
+	case VIDIOC_SUBSCRIBE_EVENT:
+	case VIDIOC_UNSUBSCRIBE_EVENT:
+		return video_ioctl2(file, cmd, arg);
+	}
+
 	ret = uvc_pm_get(handle->stream->dev);
 	if (ret)
 		return ret;