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Subject[PATCH 10/11] kvm tools: protect shared global id in compat_mtx C.S.
Date
The global id is shared, protect it when access it.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
tools/kvm/guest_compat.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/kvm/guest_compat.c b/tools/kvm/guest_compat.c
index de97df5..8dd451b 100644
--- a/tools/kvm/guest_compat.c
+++ b/tools/kvm/guest_compat.c
@@ -20,6 +20,7 @@ static LIST_HEAD(messages);
int compat__add_message(const char *title, const char *desc)
{
struct compat_message *msg;
+ int msg_id;

msg = malloc(sizeof(*msg));
if (msg == NULL)
@@ -33,12 +34,12 @@ int compat__add_message(const char *title, const char *desc)

mutex_lock(&compat_mtx);

- msg->id = id;
+ msg->id = msg_id = id++;
list_add_tail(&msg->list, &messages);

mutex_unlock(&compat_mtx);

- return id++;
+ return msg_id;

cleanup:
if (msg) {
--
1.7.4.4


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