From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 5 Nov 2021 16:31:34 +0000 (-0400)
Subject: Fix: RCU-aware add event recorder to RCU dispatch list
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=fd70f5a5f72ac11b36f67f3a4bdee03cd9a39648;p=deliverable%2Flttng-modules.git

Fix: RCU-aware add event recorder to RCU dispatch list

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0a9f95fb04d00ce8e38e047d193401ee1178eac5
---

diff --git a/src/lttng-syscalls.c b/src/lttng-syscalls.c
index b9ae5e3a..bc8e6e71 100644
--- a/src/lttng-syscalls.c
+++ b/src/lttng-syscalls.c
@@ -577,7 +577,8 @@ void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common
 			printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name);
 			return;
 		}
-		hlist_add_head(&event->priv->u.syscall.node, &dispatch_table[syscall_nr]);
+		if (dispatch_table)
+			hlist_add_head_rcu(&event->priv->u.syscall.node, &dispatch_table[syscall_nr]);
 		break;
 	}
 	case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: