4 files changed, 30 insertions, 21 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 98760553bc95..d0a21a5f8201 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 94d5ee263c20..cd50d86029e7 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 de51667dd64d..31fb204f44c6 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 386177867a8a..9d0f33fe8719 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 *);