[PATCH] PCI: add hook for PCI resource deallocation

From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>

This patch adds a hook 'pcibios_disable_device()' into pci_disable_device()
to call architecture specific PCI resource deallocation code.  It's a
opposite part of pcibios_enable_device().  We need this hook to deallocate
architecture specific PCI resource such as IRQ resource, etc..  This patch
is just for adding the hook, so 'pcibios_disable_device()' is defined as a
null function on all architecture so far.

I tested this patch on i386, x86_64 and ia64.  But it has not been tested
on other architectures because I don't have these machines.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/pci/pci.c

@@ -374,6 +374,16 @@ pci_enable_device(struct pci_dev *dev)
 	return 0;
 }
 
+/**
+ * pcibios_disable_device - disable arch specific PCI resources for device dev
+ * @dev: the PCI device to disable
+ *
+ * Disables architecture specific PCI resources for the device. This
+ * is the default implementation. Architecture implementations can
+ * override this.
+ */
+void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
+
 /**
  * pci_disable_device - Disable PCI device after use
  * @dev: PCI device to be disabled
@@ -394,6 +404,8 @@ pci_disable_device(struct pci_dev *dev)
 		pci_command &= ~PCI_COMMAND_MASTER;
 		pci_write_config_word(dev, PCI_COMMAND, pci_command);
 	}
+
+	pcibios_disable_device(dev);
 }
 
 /**