From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Thu, 15 Sep 2011 15:20:29 +0000 (-0400)
Subject: protect writing to per_cpu_call_rcu_data[*]
X-Git-Tag: v0.6.5~15
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=3670fef2faef63803d62a08f2aa4f089f3858b50;p=userspace-rcu.git

protect writing to per_cpu_call_rcu_data[*]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
index 6e80fa9..c822646 100644
--- a/urcu-call-rcu-impl.h
+++ b/urcu-call-rcu-impl.h
@@ -396,12 +396,13 @@ int set_cpu_call_rcu_data(int cpu, struct call_rcu_data *crdp)
 		errno = EINVAL;
 		return -EINVAL;
 	}
-	call_rcu_unlock(&call_rcu_mutex);
 	if (per_cpu_call_rcu_data == NULL) {
+		call_rcu_unlock(&call_rcu_mutex);
 		errno = ENOMEM;
 		return -ENOMEM;
 	}
 	per_cpu_call_rcu_data[cpu] = crdp;
+	call_rcu_unlock(&call_rcu_mutex);
 	return 0;
 }