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>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 33e6a0b995fc..831971e731f7 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;