diff options
Diffstat (limited to 'drivers/media/video/v4l2-ctrls.c')
| -rw-r--r-- | drivers/media/video/v4l2-ctrls.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c index 5f316667c142..d084cea2b3ba 100644 --- a/drivers/media/video/v4l2-ctrls.c +++ b/drivers/media/video/v4l2-ctrls.c @@ -1013,6 +1013,7 @@ static int handler_new_ref(struct v4l2_ctrl_handler *hdl, insertion is an O(1) operation. */ if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) { list_add_tail(&new_ref->node, &hdl->ctrl_refs); + hdl->nr_of_refs++; goto insert_in_hash; } @@ -2061,3 +2062,22 @@ void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh) v4l2_ctrl_unlock(ctrl); } EXPORT_SYMBOL(v4l2_ctrl_del_fh); + +int v4l2_ctrl_subscribe_fh(struct v4l2_fh *fh, + struct v4l2_event_subscription *sub, unsigned n) +{ + struct v4l2_ctrl_handler *hdl = fh->ctrl_handler; + int ret = 0; + + if (!fh->events) + ret = v4l2_event_init(fh); + if (!ret) { + if (hdl->nr_of_refs * 2 > n) + n = hdl->nr_of_refs * 2; + ret = v4l2_event_alloc(fh, n); + } + if (!ret) + ret = v4l2_event_subscribe(fh, sub); + return ret; +} +EXPORT_SYMBOL(v4l2_ctrl_subscribe_fh); |