From 63ab387ca0d1576edef35ef68e4b8ea5e0757b7a Mon Sep 17 00:00:00 2001
From: Myron Stowe <myron.stowe@redhat.com>
Date: Fri, 2 Mar 2012 12:45:01 -0700
Subject: x86/PCI: add spinlock held check to 'pcibios_fwaddrmap_lookup()'

'pcibios_fwaddrmap_lookup()' is used to maintain FW-assigned BIOS BAR
values for reinstatement when normal resource assignment attempts
fail and must be called with the 'pcibios_fwaddrmap_lock' spinlock
held.

This patch adds a WARN_ON notification if the spinlock is not currently
held by the caller.

Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 33e6a0b..831971e 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -57,6 +57,8 @@ static struct pcibios_fwaddrmap *pcibios_fwaddrmap_lookup(struct pci_dev *dev)
 {
 	struct pcibios_fwaddrmap *map;
 
+	WARN_ON(!spin_is_locked(&pcibios_fwaddrmap_lock));
+
 	list_for_each_entry(map, &pcibios_fwaddrmappings, list)
 		if (map->dev == dev)
 			return map;
-- 
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