[patch 094/164] ipmi: handle run_to_completion properly in deliver_recv_msg()

[Greg KH]

2.6.33-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jiri Kosina <jkosina@xxxxxxx>

commit a747c5abc329611220f16df0bb4cf0ca4a7fdf0c upstream.

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: Jiri Kosina <jkosina@xxxxxxx>
Acked-by: Corey Minyard <minyard@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/char/ipmi/ipmi_si_intf.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -311,9 +311,14 @@ static void deliver_recv_msg(struct smi_
 {
 	/* Deliver the message to the upper layer with the lock
 	   released. */
-	spin_unlock(&(smi_info->si_lock));
-	ipmi_smi_msg_received(smi_info->intf, msg);
-	spin_lock(&(smi_info->si_lock));
+
+	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)


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