From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 24 Dec 2014 17:10:01 +0000 (-0500)
Subject: Fix: add missing RCU read unlock
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=69d8ecd9c336ab347546956818ac73ac70202ccd;p=lttng-tools.git

Fix: add missing RCU read unlock

Master commit 24eb8569dc841f318d7964ca9a0ad0a4f9508a8e
"Fix: Missing RCU read locks in syscall_list_channel()"

Introduces unbalanced RCU read-side lock/unlock. Should be applied to
master and stable-2.6.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng-sessiond/syscall.c b/src/bin/lttng-sessiond/syscall.c
index c38f89109..bfe32ac73 100644
--- a/src/bin/lttng-sessiond/syscall.c
+++ b/src/bin/lttng-sessiond/syscall.c
@@ -409,6 +409,7 @@ ssize_t syscall_list_channel(struct ltt_kernel_channel *kchan,
 		ksyscall = lookup_syscall(syscalls_ht, syscall_table[i].name);
 		if (ksyscall) {
 			update_event_syscall_bitness(events, i, ksyscall->index);
+			rcu_read_unlock();
 			continue;
 		}
 		ksyscall = NULL;