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(+)
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: