Today, when we are applying a change to entities A, B. If A succeeds and B fails the events for A are not sent.
This change changes the code so the events for A are send right after they happen.
Cc: stable@kernel.org Fixes: b4012002f3a3 ("[media] uvcvideo: Add support for control events") Signed-off-by: Ricardo Ribalda ribalda@chromium.org Message-ID: 20250224-uvc-data-backup-v2-2-de993ed9823b@chromium.org Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Hans Verkuil hverkuil@xs4all.nl (cherry picked from commit 5c791467aea6277430da5f089b9b6c2a9d8a4af7) --- drivers/media/usb/uvc/uvc_ctrl.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 47e3e5e5c670..618e66784d0e 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1593,7 +1593,9 @@ static bool uvc_ctrl_xctrls_has_control(const struct v4l2_ext_control *xctrls, }
static void uvc_ctrl_send_events(struct uvc_fh *handle, - const struct v4l2_ext_control *xctrls, unsigned int xctrls_count) + struct uvc_entity *entity, + const struct v4l2_ext_control *xctrls, + unsigned int xctrls_count) { struct uvc_control_mapping *mapping; struct uvc_control *ctrl; @@ -1604,6 +1606,9 @@ static void uvc_ctrl_send_events(struct uvc_fh *handle, u32 changes = V4L2_EVENT_CTRL_CH_VALUE;
ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping); + if (ctrl->entity != entity) + continue; + if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS) /* Notification will be sent from an Interrupt event. */ continue; @@ -1842,11 +1847,12 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, uvc_ctrl_find_ctrl_idx(entity, ctrls, err_ctrl); goto done; + } else if (ret > 0 && !rollback) { + uvc_ctrl_send_events(handle, entity, + ctrls->controls, ctrls->count); } }
- if (!rollback) - uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count); ret = 0; done: mutex_unlock(&chain->ctrl_mutex);