X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=src%2Flttng-event-notifier-notification.c;h=52b5593ac9325b5324c9169f72ff736044a49cac;hb=4a7d870a981874db47b3c3b94f913fdd57bf19d6;hp=f681d9b79d24486ca03fa911967f6cc5fe7e3200;hpb=a83d68311879e618ea79a0f2a9f3e53e05855c7e;p=lttng-modules.git

diff --git a/src/lttng-event-notifier-notification.c b/src/lttng-event-notifier-notification.c
index f681d9b7..52b5593a 100644
--- a/src/lttng-event-notifier-notification.c
+++ b/src/lttng-event-notifier-notification.c
@@ -11,6 +11,7 @@
 #include <lttng/events.h>
 #include <lttng/msgpack.h>
 #include <lttng/event-notifier-notification.h>
+#include <wrapper/barrier.h>
 
 /*
  * The capture buffer size needs to be below 1024 bytes to avoid the
@@ -352,17 +353,23 @@ void record_error(struct lttng_event_notifier *event_notifier)
 {
 
 	struct lttng_event_notifier_group *event_notifier_group = event_notifier->group;
+	struct lttng_counter *error_counter;
 	size_t dimension_index[1];
 	int ret;
 
+	/*
+	 * lttng_smp_load_acquire paired with lttng_smp_store_release orders
+	 * creation of the error counter and setting error_counter_len
+	 * before the error_counter is used.
+	 */
+	error_counter = lttng_smp_load_acquire(&event_notifier_group->error_counter);
 	/* This group may not have an error counter attached to it. */
-	if (!event_notifier_group->error_counter)
+	if (!error_counter)
 		return;
 
 	dimension_index[0] = event_notifier->error_counter_index;
 
-	ret = event_notifier_group->error_counter->ops->counter_add(
-			event_notifier_group->error_counter->counter,
+	ret = error_counter->ops->counter_add(error_counter->counter,
 			dimension_index, 1);
 	if (ret)
 		WARN_ON_ONCE(1);