core/ipmi: Add ipmi sync messages to top of the list

[ Upstream commit 968c309 ]

In ipmi_queue_msg_sync() path OPAL will wait until it gets response from
BMC. If we do not get response ontime we may endup in kernel hardlockups.
Hence lets add sync messages to top of the queue. This will reduces the
chance of hardlockups.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>

core/ipmi.c

@@ -178,7 +178,7 @@ void ipmi_queue_msg_sync(struct ipmi_msg *msg)
 	sync_msg = msg;
 	if (msg->backend->disable_retry)
 		msg->backend->disable_retry(msg);
-	ipmi_queue_msg(msg);
+	ipmi_queue_msg_head(msg);
 	unlock(&sync_lock);
 
 	while (sync_msg == msg)