X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=ltt-events.c;h=c64c20368aa6ec07b4afa6a8b08e9a27ba5ad6af;hb=f7bdf4db0b992946342dc845c7369e9cdca46559;hp=9c4ba27bc2300012ebbfa1a631451e01d0f3db18;hpb=7371f44c2c8ea6e60c0457671af008dd018c0b5f;p=lttng-modules.git

diff --git a/ltt-events.c b/ltt-events.c
index 9c4ba27b..c64c2036 100644
--- a/ltt-events.c
+++ b/ltt-events.c
@@ -66,6 +66,10 @@ void ltt_session_destroy(struct ltt_session *session)
 
 	mutex_lock(&sessions_mutex);
 	ACCESS_ONCE(session->active) = 0;
+	list_for_each_entry(chan, &session->chan, list) {
+		ret = lttng_syscalls_unregister(chan);
+		WARN_ON(ret);
+	}
 	list_for_each_entry(event, &session->events, list) {
 		ret = _ltt_event_unregister(event);
 		WARN_ON(ret);
@@ -262,7 +266,8 @@ void _ltt_channel_destroy(struct ltt_channel *chan)
  */
 struct ltt_event *ltt_event_create(struct ltt_channel *chan,
 				   struct lttng_kernel_event *event_param,
-				   void *filter)
+				   void *filter,
+				   const struct lttng_event_desc *internal_desc)
 {
 	struct ltt_event *event;
 	int ret;
@@ -361,6 +366,11 @@ struct ltt_event *ltt_event_create(struct ltt_channel *chan,
 		ret = try_module_get(event->desc->owner);
 		WARN_ON_ONCE(!ret);
 		break;
+	case LTTNG_KERNEL_NOOP:
+		event->desc = internal_desc;
+		if (!event->desc)
+			goto register_error;
+		break;
 	default:
 		WARN_ON_ONCE(1);
 	}
@@ -372,10 +382,7 @@ struct ltt_event *ltt_event_create(struct ltt_channel *chan,
 	return event;
 
 statedump_error:
-	WARN_ON_ONCE(tracepoint_probe_unregister(event_param->name,
-				event->desc->probe_callback,
-				event));
-	ltt_event_put(event->desc);
+	/* If a statedump error occurs, events will not be readable. */
 register_error:
 	kmem_cache_free(event_cache, event);
 cache_error:
@@ -412,6 +419,9 @@ int _ltt_event_unregister(struct ltt_event *event)
 		lttng_ftrace_unregister(event);
 		ret = 0;
 		break;
+	case LTTNG_KERNEL_NOOP:
+		ret = 0;
+		break;
 	default:
 		WARN_ON_ONCE(1);
 	}
@@ -440,6 +450,8 @@ void _ltt_event_destroy(struct ltt_event *event)
 		module_put(event->desc->owner);
 		lttng_ftrace_destroy_private(event);
 		break;
+	case LTTNG_KERNEL_NOOP:
+		break;
 	default:
 		WARN_ON_ONCE(1);
 	}
@@ -487,7 +499,7 @@ int lttng_metadata_printf(struct ltt_session *session,
 		 * we need to bail out after timeout or being
 		 * interrupted.
 		 */
-		waitret = wait_event_interruptible_timeout(*chan->ops->get_reader_wait_queue(chan->chan),
+		waitret = wait_event_interruptible_timeout(*chan->ops->get_writer_buf_wait_queue(chan->chan, -1),
 			({
 				ret = chan->ops->event_reserve(&ctx, 0);
 				ret != -ENOBUFS || !ret;