[PATCH v6 5/5] media: uvcvideo: Flush the control cache when we get an event

Ricardo Ribalda
2024-12-03T21:20:29Z

Asynchronous controls trigger an event when they have completed their
operation.

This can make that the control cached value does not match the value in
the device.

Let's flush the cache to be on the safe side.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/usb/uvc/uvc_ctrl.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 3dc9b7a49f64..db29e0e8bfd4 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1622,6 +1622,9 @@ void uvc_ctrl_status_event(struct uvc_video_chain *chain,

mutex_lock(&chain->ctrl_mutex);

+ /* Flush the control cache, the data might have changed. */
+ ctrl->loaded = 0;
+
handle = ctrl->handle;
if (handle)
uvc_ctrl_set_handle(handle, ctrl, NULL);

--
2.47.0.338.g60cca15819-goog