X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=ltt-events.c;h=3532dee5a1c8d46e246fa14c8e6c07a1257f26c7;hb=refs%2Ftags%2Fv2.0-pre1;hp=e9e076d802238bc07e1aef14e0bb4f1e2914df6b;hpb=a864fb02d6918ad014596afef779c964e061c127;p=lttng-modules.git

diff --git a/ltt-events.c b/ltt-events.c
index e9e076d8..3532dee5 100644
--- a/ltt-events.c
+++ b/ltt-events.c
@@ -196,7 +196,7 @@ struct ltt_channel *ltt_channel_create(struct ltt_session *session,
 				       unsigned int read_timer_interval)
 {
 	struct ltt_channel *chan;
-	struct ltt_transport *transport;
+	struct ltt_transport *transport = NULL;
 
 	mutex_lock(&sessions_mutex);
 	if (session->been_active)
@@ -207,6 +207,10 @@ struct ltt_channel *ltt_channel_create(struct ltt_session *session,
 		       transport_name);
 		goto notransport;
 	}
+	if (!try_module_get(transport->owner)) {
+		printk(KERN_WARNING "LTT : Can't lock transport module.\n");
+		goto notransport;
+	}
 	chan = kzalloc(sizeof(struct ltt_channel), GFP_KERNEL);
 	if (!chan)
 		goto nomem;
@@ -224,6 +228,7 @@ struct ltt_channel *ltt_channel_create(struct ltt_session *session,
 		goto create_error;
 	chan->enabled = 1;
 	chan->ops = &transport->ops;
+	chan->transport = transport;
 	list_add(&chan->list, &session->chan);
 	mutex_unlock(&sessions_mutex);
 	return chan;
@@ -231,6 +236,8 @@ struct ltt_channel *ltt_channel_create(struct ltt_session *session,
 create_error:
 	kfree(chan);
 nomem:
+	if (transport)
+		module_put(transport->owner);
 notransport:
 active:
 	mutex_unlock(&sessions_mutex);
@@ -244,6 +251,7 @@ static
 void _ltt_channel_destroy(struct ltt_channel *chan)
 {
 	chan->ops->channel_destroy(chan->chan);
+	module_put(chan->transport->owner);
 	list_del(&chan->list);
 	lttng_destroy_context(chan->ctx);
 	kfree(chan);