PCI: acpiphp: remove unused res_lock

res_lock is never used, so remove it.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/hotplug/acpiphp.h

@@ -89,8 +89,6 @@ struct acpiphp_bridge {
 
 	/* PCI-to-PCI bridge device */
 	struct pci_dev *pci_dev;
-
-	spinlock_t res_lock;
 };
 
 

drivers/pci/hotplug/acpiphp_glue.c

@@ -391,8 +391,6 @@ static void add_host_bridge(acpi_handle *handle)
 
 	bridge->pci_bus = root->bus;
 
-	spin_lock_init(&bridge->res_lock);
-
 	init_bridge_misc(bridge);
 }
 
@@ -425,7 +423,6 @@ static void add_p2p_bridge(acpi_handle *handle)
 	 * (which we access during module unload).
 	 */
 	get_device(&bridge->pci_bus->dev);
-	spin_lock_init(&bridge->res_lock);
 
 	init_bridge_misc(bridge);
 	return;