diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index bf75f63617731595d958765b7c1582f79452f3cb..ef4a418f630aefaa3d55390705e546f43642f7cb 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -3959,6 +3959,10 @@ void ipmi_smi_msg_received(ipmi_smi_t          intf,
 
 	if (!run_to_completion)
 		spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
+	/*
+	 * We can get an asynchronous event or receive message in addition
+	 * to commands we send.
+	 */
 	if (msg == intf->curr_msg)
 		intf->curr_msg = NULL;
 	if (!run_to_completion)