From 4aba41ea8bdc1b475861f5e5c1649ab20251090c Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@redhat.com>
Date: Tue, 14 Oct 2008 11:29:06 +0100
Subject: 8250: Fix lock warning (and possible crash)

Splitting the 8250 code back up to avoid a clash with the NR_IRQS removal
patch introduced a last minute bug. Put back the additional needed lines
for the old lock init

Signed-off-by: Alan Cox <alan@redhat.com>
[ Ingo also reports that this can cause a spontaneous reboot crash with
  certain configs, and sends in an identical patch ]
Tested-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index d4104a3..d3ca7d3 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2969,6 +2969,9 @@ static int __init serial8250_init(void)
 		"%d ports, IRQ sharing %sabled\n", nr_uarts,
 		share_irqs ? "en" : "dis");
 
+	for (i = 0; i < NR_IRQS; i++)
+		spin_lock_init(&irq_lists[i].lock);
+
 #ifdef CONFIG_SPARC
 	ret = sunserial_register_minors(&serial8250_reg, UART_NR);
 #else
-- 
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