media: uvcvideo: Fix event flags in uvc_ctrl_send_events

commit c31cffd5ae2c3d7ef21d9008977a9d117ce7a64e upstream.

If there is an event that needs the V4L2_EVENT_CTRL_CH_FLAGS flag, all
the following events will have that flag, regardless if they need it or
not.

This is because we keep using the same variable all the time and we do
not reset its original value.

Cc: stable@vger.kernel.org
Fixes: 805e9b4a06bf ("[media] uvcvideo: Send control change events for slave ctrls when the master changes")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20241114-uvc-roi-v15-1-64cfeb56b6f8@chromium.org
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index dc8d790eb91145441fcfdbff668b0942e1325add..f042a8637db6b568d72d58b21e54a9fc4f3f6dde 100644 (file)
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1400,13 +1400,13 @@ static void uvc_ctrl_send_events(struct uvc_fh *handle,
 {
        struct uvc_control_mapping *mapping;
        struct uvc_control *ctrl;
-       u32 changes = V4L2_EVENT_CTRL_CH_VALUE;
        unsigned int i;
        unsigned int j;
 
        for (i = 0; i < xctrls_count; ++i) {
-               ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping);
+               u32 changes = V4L2_EVENT_CTRL_CH_VALUE;
 
+               ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping);
                if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
                        /* Notification will be sent from an Interrupt event. */
                        continue;