[PATCH v2 12/12] media: uvcvideo: Do not create MC entities for virtual entities

[Ricardo Ribalda <ribalda@chromium.org>]

Neither the GPIO nor the SWENTITY entities form part of the device
pipeline. We just create them to hold emulated uvc controls.

When the device initializes, a warning is thrown by the v4l2 core:
uvcvideo 1-1:1.0: Entity type for entity SWENTITY was not initialized!

There are no entity function that matches what we are doing here, and
it does not make to much sense to create a function for entities that
do not really exist.

Do not create MC entities for them and pretend nothing happened here.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_entity.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c
index d1a652ef35ec34801bd39a5124b834edf838a79e..2dbeb4ab0c4c8cc763ff2dcd2d836a50f3c6a040 100644
--- a/drivers/media/usb/uvc/uvc_entity.c
+++ b/drivers/media/usb/uvc/uvc_entity.c
@@ -72,6 +72,16 @@ static int uvc_mc_init_entity(struct uvc_video_chain *chain,
 {
 	int ret;
 
+	/*
+	 * Do not initialize virtual entities, they do not really exist
+	 * and are not connected to any other entities.
+	 */
+	switch (UVC_ENTITY_TYPE(entity)) {
+	case UVC_EXT_GPIO_UNIT:
+	case UVC_SWENTITY_UNIT:
+		return 0;
+	}
+
 	if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) {
 		u32 function;
 

-- 
2.50.0.rc0.642.g800a2b2222-goog