1 files changed, 28 insertions, 3 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index ed1cc8530a93..637b2bea5563 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -230,6 +230,13 @@ static int usb_probe_interface(struct device *dev)
                  */
                 intf->pm_usage_cnt = !(driver->supports_autosuspend);
 
+                /* Carry out a deferred switch to altsetting 0 */
+                if (intf->needs_altsetting0) {
+                        usb_set_interface(udev, intf->altsetting[0].
+                                        desc.bInterfaceNumber, 0);
+                        intf->needs_altsetting0 = 0;
+                }
+
                 error = driver->probe(intf, id);
                 if (error) {
                         mark_quiesced(intf);
@@ -266,8 +273,17 @@ static int usb_unbind_interface(struct device *dev)
 
         driver->disconnect(intf);
 
-        /* reset other interface state */
-        usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
+        /* Reset other interface state.
+         * We cannot do a Set-Interface if the device is suspended or
+         * if it is prepared for a system sleep (since installing a new
+         * altsetting means creating new endpoint device entries).
+         * When either of these happens, defer the Set-Interface.
+         */
+        if (!error && intf->dev.power.status == DPM_ON)
+                usb_set_interface(udev, intf->altsetting[0].
+                                desc.bInterfaceNumber, 0);
+        else
+                intf->needs_altsetting0 = 1;
         usb_set_intfdata(intf, NULL);
 
         intf->condition = USB_INTERFACE_UNBOUND;
@@ -975,8 +991,17 @@ static int usb_resume_interface(struct usb_device *udev,
                 goto done;
 
         /* Can't resume it if it doesn't have a driver. */
-        if (intf->condition == USB_INTERFACE_UNBOUND)
+        if (intf->condition == USB_INTERFACE_UNBOUND) {
+
+                /* Carry out a deferred switch to altsetting 0 */
+                if (intf->needs_altsetting0 &&
+                                intf->dev.power.status == DPM_ON) {
+                        usb_set_interface(udev, intf->altsetting[0].
+                                        desc.bInterfaceNumber, 0);
+                        intf->needs_altsetting0 = 0;
+                }
                 goto done;
+        }
 
         /* Don't resume if the interface is marked for rebinding */
         if (intf->needs_binding)