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[1/9] media: uvcvideo: Do not set an async control owned by other fh

Message ID 20241126-uvc-granpower-ng-v1-1-6312bf26549c@chromium.org
State Superseded
Headers show
Series media: uvcvideo: Implement Granular Power Saving | expand

Commit Message

Ricardo Ribalda Nov. 26, 2024, 4:18 p.m. UTC 
If a file handle is waiting for a response from an async control, avoid
that other file handle operate with it.

Without this patch, the first file handle will never get the event
associated to that operation.

Cc: stable@vger.kernel.org
Fixes: e5225c820c05 ("media: uvcvideo: Send a control event when a Control Change interrupt arrives")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 4fe26e82e3d1..5d3a28edf7f0 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1950,6 +1950,10 @@  int uvc_ctrl_set(struct uvc_fh *handle,
 	if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
 		return -EACCES;
 
+	/* Other file handle is waiting a response from this async control. */
+	if (ctrl->handle && ctrl->handle != handle)
+		return -EBUSY;
+
 	/* Clamp out of range values. */
 	switch (mapping->v4l2_type) {
 	case V4L2_CTRL_TYPE_INTEGER: