diff -urN linux.vanilla/drivers/pci/pci.c linux/drivers/pci/pci.c
--- linux.vanilla/drivers/pci/pci.c	Wed Mar  7 01:44:15 2001
+++ linux/drivers/pci/pci.c	Sun Apr 15 04:32:41 2001
@@ -286,12 +286,33 @@
 {
 	int err;
 
+	pci_set_power_state(dev, 0);
 	if ((err = pcibios_enable_device(dev)) < 0)
 		return err;
-	pci_set_power_state(dev, 0);
 	return 0;
 }
 
+/**
+ * pci_disable_device - Disable PCI device after use
+ * @dev: PCI device to be disabled
+ *
+ * Signal to the system that the PCI device is not in use by the system
+ * anymore.  Currently this only involves disabling PCI busmastering,
+ * if active.
+ */
+
+void
+pci_disable_device(struct pci_dev *dev)
+{
+	u16 pci_command;
+
+	pci_read_config_word(dev, PCI_COMMAND, &pci_command);
+	if (pci_command & PCI_COMMAND_MASTER) {
+		pci_command &= ~PCI_COMMAND_MASTER;
+		pci_write_config_word(dev, PCI_COMMAND, pci_command);
+	}
+}
+
 int
 pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
 {
@@ -1381,6 +1402,7 @@
 EXPORT_SYMBOL(pci_devices);
 EXPORT_SYMBOL(pci_root_buses);
 EXPORT_SYMBOL(pci_enable_device);
+EXPORT_SYMBOL(pci_disable_device);
 EXPORT_SYMBOL(pci_find_capability);
 EXPORT_SYMBOL(pci_release_regions);
 EXPORT_SYMBOL(pci_request_regions);
diff -urN linux.vanilla/include/linux/pci.h linux/include/linux/pci.h
--- linux.vanilla/include/linux/pci.h	Mon Mar 26 18:48:46 2001
+++ linux/include/linux/pci.h	Sun Apr 15 04:27:28 2001
@@ -525,7 +525,9 @@
 int pci_write_config_word(struct pci_dev *dev, int where, u16 val);
 int pci_write_config_dword(struct pci_dev *dev, int where, u32 val);
 
+#define HAVE_PCI_DISABLE_DEVICE
 int pci_enable_device(struct pci_dev *dev);
+void pci_disable_device(struct pci_dev *dev);
 void pci_set_master(struct pci_dev *dev);
 int pci_set_dma_mask(struct pci_dev *dev, dma_addr_t mask);
 int pci_set_power_state(struct pci_dev *dev, int state);
@@ -594,6 +596,7 @@
 
 static inline void pci_set_master(struct pci_dev *dev) { }
 static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
+static inline void pci_disable_device(struct pci_dev *dev) { }
 static inline int pci_module_init(struct pci_driver *drv) { return -ENODEV; }
 static inline int pci_assign_resource(struct pci_dev *dev, int i) { return -EBUSY;}
 static inline int pci_register_driver(struct pci_driver *drv) { return 0;}