4 files changed, 17 insertions, 7 deletions

diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index ff03184da403..a08787e253aa 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -99,4 +99,11 @@ config USB_OTG_WHITELIST
           normal Linux-USB hosts do (other than the warning), and is
           convenient for many stages of product development.
 
+config USB_OTG_BLACKLIST_HUB
+        bool "Disable external hubs"
+        depends on USB_OTG
+        help
+          If you say Y here, then Linux will refuse to enumerate
+          external hubs.  OTG hosts are allowed to reduce hardware
+          and software costs by not supporting external hubs.
 
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 0d2193b69235..66b78404ab34 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -213,11 +213,9 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
 
         if (hcd->driver->suspend) {
                 retval = hcd->driver->suspend(hcd, message);
-                if (retval) {
-                        dev_dbg (&dev->dev, "PCI pre-suspend fail, %d\n",
-                                retval);
+                suspend_report_result(hcd->driver->suspend, retval);
+                if (retval)
                         goto done;
-                }
         }
         synchronize_irq(dev->irq);
 
@@ -263,6 +261,7 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
                  * some device state (e.g. as part of clock reinit).
                  */
                 retval = pci_set_power_state (dev, PCI_D3hot);
+                suspend_report_result(pci_set_power_state, retval);
                 if (retval == 0) {
                         int wake = device_can_wakeup(&hcd->self.root_hub->dev);
 
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 8e65f7a237e4..0c87f73f2933 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -836,6 +836,13 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
         desc = intf->cur_altsetting;
         hdev = interface_to_usbdev(intf);
 
+#ifdef  CONFIG_USB_OTG_BLACKLIST_HUB
+        if (hdev->parent) {
+                dev_warn(&intf->dev, "ignoring external hub\n");
+                return -ENODEV;
+        }
+#endif
+
         /* Some hubs have a subclass of 1, which AFAICT according to the */
         /*  specs is not defined, but it works */
         if ((desc->desc.bInterfaceSubClass != 0) &&
@@ -1022,7 +1029,6 @@ void usb_set_device_state(struct usb_device *udev,
                 recursively_mark_NOTATTACHED(udev);
         spin_unlock_irqrestore(&device_state_lock, flags);
 }
-EXPORT_SYMBOL(usb_set_device_state);
 
 
 #ifdef CONFIG_PM
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index d7352aa73b5e..b7fdc1cd134a 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -1194,7 +1194,6 @@ EXPORT_SYMBOL(usb_disabled);
 EXPORT_SYMBOL_GPL(usb_get_intf);
 EXPORT_SYMBOL_GPL(usb_put_intf);
 
-EXPORT_SYMBOL(usb_alloc_dev);
 EXPORT_SYMBOL(usb_put_dev);
 EXPORT_SYMBOL(usb_get_dev);
 EXPORT_SYMBOL(usb_hub_tt_clear_buffer);
@@ -1208,7 +1207,6 @@ EXPORT_SYMBOL(usb_ifnum_to_if);
 EXPORT_SYMBOL(usb_altnum_to_altsetting);
 
 EXPORT_SYMBOL(usb_reset_device);
-EXPORT_SYMBOL(usb_disconnect);
 
 EXPORT_SYMBOL(__usb_get_extra_descriptor);