ipmi: handle run_to_completion properly in deliver_recv_msg()

If run_to_completion flag is set, it means that we are running in a
single-threaded mode, and thus no locks are held.

This fixes a deadlock when IPMI notifier is being called during panic.
Signed-off-by: NJiri Kosina <jkosina@suse.cz>
Acked-by: NCorey Minyard <minyard@acm.org>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/ipmi/ipmi_si_intf.c

@@ -323,9 +323,14 @@ static void deliver_recv_msg(struct smi_info *smi_info,
 {
 	/* Deliver the message to the upper layer with the lock
 	   released. */
+
+	if (smi_info->run_to_completion) {
+		ipmi_smi_msg_received(smi_info->intf, msg);
+	} else {
 		spin_unlock(&(smi_info->si_lock));
 		ipmi_smi_msg_received(smi_info->intf, msg);
 		spin_lock(&(smi_info->si_lock));
+	}
 }
 
 static void return_hosed_msg(struct smi_info *smi_info, int cCode)