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From: Greg KH on 1 Jul 2010 17:00
2.6.33-stable review patch. If anyone has any objections, please let me know.

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

From: Jiri Kosina <jkosina(a)suse.cz>

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(a)suse.cz>
Acked-by: Corey Minyard <minyard(a)acm.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
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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Next: [patch 106/164] arch/x86/kernel: Add missing spin_unlock