[PATCH v4 5/5] media: uvcvideo: Do not turn on the camera for some ioctls

[Ricardo Ribalda]

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

Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 6af93e00b304..de8d26164996 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1450,6 +1450,26 @@ static long uvc_v4l2_video_ioctl2(struct file *file,
 {
 	struct uvc_fh *handle = file->private_data;
 
+	/* 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);
+	}
+
 	guard(uvc_pm)(handle->stream->dev);
 
 	return video_ioctl2(file, cmd, arg);

-- 
2.48.1.658.g4767266eb4-goog