4 files changed, 30 insertions, 21 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 98760553bc9..d0a21a5f820 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -284,7 +284,7 @@ static int usb_unbind_interface(struct device *dev)
 	 * supports "soft" unbinding.
 	 */
 	if (!driver->soft_unbind)
-		usb_disable_interface(udev, intf);
+		usb_disable_interface(udev, intf, false);
 
 	driver->disconnect(intf);
 	usb_cancel_queued_reset(intf);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 94d5ee263c2..cd50d86029e 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2382,8 +2382,8 @@ static int hub_port_debounce(struct usb_hub *hub, int port1)
 
 void usb_ep0_reinit(struct usb_device *udev)
 {
-	usb_disable_endpoint(udev, 0 + USB_DIR_IN);
-	usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
+	usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
+	usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
 	usb_enable_endpoint(udev, &udev->ep0, true);
 }
 EXPORT_SYMBOL_GPL(usb_ep0_reinit);
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index de51667dd64..31fb204f44c 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1039,14 +1039,15 @@ static void remove_intf_ep_devs(struct usb_interface *intf)
  * @dev: the device whose endpoint is being disabled
  * @epaddr: the endpoint's address.  Endpoint number for output,
  *	endpoint number + USB_DIR_IN for input
+ * @reset_hardware: flag to erase any endpoint state stored in the
+ *	controller hardware
  *
- * Deallocates hcd/hardware state for this endpoint ... and nukes all
- * pending urbs.
- *
- * If the HCD hasn't registered a disable() function, this sets the
- * endpoint's maxpacket size to 0 to prevent further submissions.
+ * Disables the endpoint for URB submission and nukes all pending URBs.
+ * If @reset_hardware is set then also deallocates hcd/hardware state
+ * for the endpoint.
  */
-void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr)
+void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
+		bool reset_hardware)
 {
 	unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK;
 	struct usb_host_endpoint *ep;
@@ -1056,15 +1057,18 @@ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr)
 
 	if (usb_endpoint_out(epaddr)) {
 		ep = dev->ep_out[epnum];
-		dev->ep_out[epnum] = NULL;
+		if (reset_hardware)
+			dev->ep_out[epnum] = NULL;
 	} else {
 		ep = dev->ep_in[epnum];
-		dev->ep_in[epnum] = NULL;
+		if (reset_hardware)
+			dev->ep_in[epnum] = NULL;
 	}
 	if (ep) {
 		ep->enabled = 0;
 		usb_hcd_flush_endpoint(dev, ep);
-		usb_hcd_disable_endpoint(dev, ep);
+		if (reset_hardware)
+			usb_hcd_disable_endpoint(dev, ep);
 	}
 }
 
@@ -1072,17 +1076,21 @@ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr)
  * usb_disable_interface -- Disable all endpoints for an interface
  * @dev: the device whose interface is being disabled
  * @intf: pointer to the interface descriptor
+ * @reset_hardware: flag to erase any endpoint state stored in the
+ *	controller hardware
  *
  * Disables all the endpoints for the interface's current altsetting.
  */
-void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf)
+void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf,
+		bool reset_hardware)
 {
 	struct usb_host_interface *alt = intf->cur_altsetting;
 	int i;
 
 	for (i = 0; i < alt->desc.bNumEndpoints; ++i) {
 		usb_disable_endpoint(dev,
-				alt->endpoint[i].desc.bEndpointAddress);
+				alt->endpoint[i].desc.bEndpointAddress,
+				reset_hardware);
 	}
 }
 
@@ -1103,8 +1111,8 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
 	dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__,
 		skip_ep0 ? "non-ep0" : "all");
 	for (i = skip_ep0; i < 16; ++i) {
-		usb_disable_endpoint(dev, i);
-		usb_disable_endpoint(dev, i + USB_DIR_IN);
+		usb_disable_endpoint(dev, i, true);
+		usb_disable_endpoint(dev, i + USB_DIR_IN, true);
 	}
 	dev->toggle[0] = dev->toggle[1] = 0;
 
@@ -1274,7 +1282,7 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 		remove_intf_ep_devs(iface);
 		usb_remove_sysfs_intf_files(iface);
 	}
-	usb_disable_interface(dev, iface);
+	usb_disable_interface(dev, iface, true);
 
 	iface->cur_altsetting = alt;
 
@@ -1353,8 +1361,8 @@ int usb_reset_configuration(struct usb_device *dev)
 	 */
 
 	for (i = 1; i < 16; ++i) {
-		usb_disable_endpoint(dev, i);
-		usb_disable_endpoint(dev, i + USB_DIR_IN);
+		usb_disable_endpoint(dev, i, true);
+		usb_disable_endpoint(dev, i + USB_DIR_IN, true);
 	}
 
 	config = dev->actconfig;
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 386177867a8..9d0f33fe871 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -15,9 +15,10 @@ extern void usb_enable_endpoint(struct usb_device *dev,
 		struct usb_host_endpoint *ep, bool reset_toggle);
 extern void usb_enable_interface(struct usb_device *dev,
 		struct usb_interface *intf, bool reset_toggles);
-extern void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr);
+extern void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
+		bool reset_hardware);
 extern void usb_disable_interface(struct usb_device *dev,
-		struct usb_interface *intf);
+		struct usb_interface *intf, bool reset_hardware);
 extern void usb_release_interface_cache(struct kref *ref);
 extern void usb_disable_device(struct usb_device *dev, int skip_ep0);
 extern int usb_deauthorize_device(struct usb_device *);