7 files changed, 126 insertions, 77 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 2be37fe466f2..5a7fa6f09958 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;
@@ -798,7 +814,8 @@ void usb_forced_unbind_intf(struct usb_interface *intf)
  * The caller must hold @intf's device's lock, but not its pm_mutex
  * and not @intf->dev.sem.
  *
- * FIXME: The caller must block system sleep transitions.
+ * Note: Rebinds will be skipped if a system sleep transition is in
+ * progress and the PM "complete" callback hasn't occurred yet.
  */
 void usb_rebind_intf(struct usb_interface *intf)
 {
@@ -814,10 +831,12 @@ void usb_rebind_intf(struct usb_interface *intf)
         }
 
         /* Try to rebind the interface */
-        intf->needs_binding = 0;
-        rc = device_attach(&intf->dev);
-        if (rc < 0)
-                dev_warn(&intf->dev, "rebind failed: %d\n", rc);
+        if (intf->dev.power.status == DPM_ON) {
+                intf->needs_binding = 0;
+                rc = device_attach(&intf->dev);
+                if (rc < 0)
+                        dev_warn(&intf->dev, "rebind failed: %d\n", rc);
+        }
 }
 
 #ifdef CONFIG_PM
@@ -829,7 +848,6 @@ void usb_rebind_intf(struct usb_interface *intf)
  * or rebind interfaces that have been unbound, according to @action.
  *
  * The caller must hold @udev's device lock.
- * FIXME: For rebinds, the caller must block system sleep transitions.
  */
 static void do_unbind_rebind(struct usb_device *udev, int action)
 {
@@ -851,22 +869,8 @@ static void do_unbind_rebind(struct usb_device *udev, int action)
                                 }
                                 break;
                         case DO_REBIND:
-                                if (intf->needs_binding) {
-
-        /* FIXME: The next line is needed because we are going to probe
-         * the interface, but as far as the PM core is concerned the
-         * interface is still suspended.  The problem wouldn't exist
-         * if we could rebind the interface during the interface's own
-         * resume() call, but at the time the usb_device isn't locked!
-         *
-         * The real solution will be to carry this out during the device's
-         * complete() callback.  Until that is implemented, we have to
-         * use this hack.
-         */
-//                                      intf->dev.power.sleeping = 0;
-
+                                if (intf->needs_binding)
                                         usb_rebind_intf(intf);
-                                }
                                 break;
                         }
                 }
@@ -926,14 +930,14 @@ static int usb_resume_device(struct usb_device *udev)
 }
 
 /* Caller has locked intf's usb_device's pm mutex */
-static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg)
+static int usb_suspend_interface(struct usb_device *udev,
+                struct usb_interface *intf, pm_message_t msg)
 {
         struct usb_driver       *driver;
         int                     status = 0;
 
         /* with no hardware, USB interfaces only use FREEZE and ON states */
-        if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED ||
-                        !is_active(intf))
+        if (udev->state == USB_STATE_NOTATTACHED || !is_active(intf))
                 goto done;
 
         if (intf->condition == USB_INTERFACE_UNBOUND)   /* This can't happen */
@@ -944,7 +948,7 @@ static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg)
                 status = driver->suspend(intf, msg);
                 if (status == 0)
                         mark_quiesced(intf);
-                else if (!interface_to_usbdev(intf)->auto_pm)
+                else if (!udev->auto_pm)
                         dev_err(&intf->dev, "%s error %d\n",
                                         "suspend", status);
         } else {
@@ -961,13 +965,13 @@ static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg)
 }
 
 /* Caller has locked intf's usb_device's pm_mutex */
-static int usb_resume_interface(struct usb_interface *intf, int reset_resume)
+static int usb_resume_interface(struct usb_device *udev,
+                struct usb_interface *intf, int reset_resume)
 {
         struct usb_driver       *driver;
         int                     status = 0;
 
-        if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED ||
-                        is_active(intf))
+        if (udev->state == USB_STATE_NOTATTACHED || is_active(intf))
                 goto done;
 
         /* Don't let autoresume interfere with unbinding */
@@ -975,8 +979,17 @@ static int usb_resume_interface(struct usb_interface *intf, int reset_resume)
                 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)
@@ -1151,7 +1164,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
         if (udev->actconfig) {
                 for (; i < udev->actconfig->desc.bNumInterfaces; i++) {
                         intf = udev->actconfig->interface[i];
-                        status = usb_suspend_interface(intf, msg);
+                        status = usb_suspend_interface(udev, intf, msg);
                         if (status != 0)
                                 break;
                 }
@@ -1163,7 +1176,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
         if (status != 0) {
                 while (--i >= 0) {
                         intf = udev->actconfig->interface[i];
-                        usb_resume_interface(intf, 0);
+                        usb_resume_interface(udev, intf, 0);
                 }
 
                 /* Try another autosuspend when the interfaces aren't busy */
@@ -1276,7 +1289,7 @@ static int usb_resume_both(struct usb_device *udev)
         if (status == 0 && udev->actconfig) {
                 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
                         intf = udev->actconfig->interface[i];
-                        usb_resume_interface(intf, udev->reset_resume);
+                        usb_resume_interface(udev, intf, udev->reset_resume);
                 }
         }
 
@@ -1605,12 +1618,10 @@ int usb_external_resume_device(struct usb_device *udev)
         return status;
 }
 
-static int usb_suspend(struct device *dev, pm_message_t message)
+int usb_suspend(struct device *dev, pm_message_t message)
 {
         struct usb_device       *udev;
 
-        if (!is_usb_device(dev))        /* Ignore PM for interfaces */
-                return 0;
         udev = to_usb_device(dev);
 
         /* If udev is already suspended, we can skip this suspend and
@@ -1629,12 +1640,10 @@ static int usb_suspend(struct device *dev, pm_message_t message)
         return usb_external_suspend_device(udev, message);
 }
 
-static int usb_resume(struct device *dev)
+int usb_resume(struct device *dev)
 {
         struct usb_device       *udev;
 
-        if (!is_usb_device(dev))        /* Ignore PM for interfaces */
-                return 0;
         udev = to_usb_device(dev);
 
         /* If udev->skip_sys_resume is set then udev was already suspended
@@ -1646,17 +1655,10 @@ static int usb_resume(struct device *dev)
         return usb_external_resume_device(udev);
 }
 
-#else
-
-#define usb_suspend     NULL
-#define usb_resume      NULL
-
 #endif /* CONFIG_PM */
 
 struct bus_type usb_bus_type = {
         .name =         "usb",
         .match =        usb_device_match,
         .uevent =       usb_uevent,
-        .suspend =      usb_suspend,
-        .resume =       usb_resume,
 };
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index f7bfd72ef115..8abd4e59bf4a 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -924,15 +924,6 @@ static int register_root_hub(struct usb_hcd *hcd)
         return retval;
 }
 
-void usb_enable_root_hub_irq (struct usb_bus *bus)
-{
-        struct usb_hcd *hcd;
-
-        hcd = container_of (bus, struct usb_hcd, self);
-        if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT)
-                hcd->driver->hub_irq_enable (hcd);
-}
-
 
 /*-------------------------------------------------------------------------*/
 
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 5b0b59b0d89b..e710ce04e228 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -212,8 +212,6 @@ struct hc_driver {
         int     (*bus_suspend)(struct usb_hcd *);
         int     (*bus_resume)(struct usb_hcd *);
         int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
-        void    (*hub_irq_enable)(struct usb_hcd *);
-                /* Needed only if port-change IRQs are level-triggered */
 
                 /* force handover of high-speed port to full-speed companion */
         void    (*relinquish_port)(struct usb_hcd *, int);
@@ -379,8 +377,6 @@ extern struct list_head usb_bus_list;
 extern struct mutex usb_bus_list_lock;
 extern wait_queue_head_t usb_kill_urb_queue;
 
-extern void usb_enable_root_hub_irq(struct usb_bus *bus);
-
 extern int usb_find_interface_driver(struct usb_device *dev,
         struct usb_interface *interface);
 
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 107e1d25ddec..6a5cb018383d 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2102,8 +2102,6 @@ int usb_port_resume(struct usb_device *udev)
         }
 
         clear_bit(port1, hub->busy_bits);
-        if (!hub->hdev->parent && !hub->busy_bits[0])
-                usb_enable_root_hub_irq(hub->hdev->bus);
 
         status = check_port_resume_type(udev,
                         hub, port1, status, portchange, portstatus);
@@ -3081,11 +3079,6 @@ static void hub_events(void)
                         }
                 }
 
-                /* If this is a root hub, tell the HCD it's okay to
-                 * re-enable port-change interrupts now. */
-                if (!hdev->parent && !hub->busy_bits[0])
-                        usb_enable_root_hub_irq(hdev->bus);
-
 loop_autopm:
                 /* Allow autosuspend if we're not going to run again */
                 if (list_empty(&hub->event_list))
@@ -3311,8 +3304,6 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
                         break;
         }
         clear_bit(port1, parent_hub->busy_bits);
-        if (!parent_hdev->parent && !parent_hub->busy_bits[0])
-                usb_enable_root_hub_irq(parent_hdev->bus);
 
         if (ret < 0)
                 goto re_enumerate;
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index c0b1ae25ae2a..47111e88f791 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -601,15 +601,20 @@ EXPORT_SYMBOL_GPL(usb_kill_anchored_urbs);
 void usb_unlink_anchored_urbs(struct usb_anchor *anchor)
 {
         struct urb *victim;
+        unsigned long flags;
 
-        spin_lock_irq(&anchor->lock);
+        spin_lock_irqsave(&anchor->lock, flags);
         while (!list_empty(&anchor->urb_list)) {
                 victim = list_entry(anchor->urb_list.prev, struct urb,
                                     anchor_list);
+                usb_get_urb(victim);
+                spin_unlock_irqrestore(&anchor->lock, flags);
                 /* this will unanchor the URB */
                 usb_unlink_urb(victim);
+                usb_put_urb(victim);
+                spin_lock_irqsave(&anchor->lock, flags);
         }
-        spin_unlock_irq(&anchor->lock);
+        spin_unlock_irqrestore(&anchor->lock, flags);
 }
 EXPORT_SYMBOL_GPL(usb_unlink_anchored_urbs);
 
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 84fcaa6a21ec..be1fa0723f2c 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -219,12 +219,6 @@ static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 }
 #endif  /* CONFIG_HOTPLUG */
 
-struct device_type usb_device_type = {
-        .name =         "usb_device",
-        .release =      usb_release_dev,
-        .uevent =       usb_dev_uevent,
-};
-
 #ifdef  CONFIG_PM
 
 static int ksuspend_usb_init(void)
@@ -244,13 +238,80 @@ static void ksuspend_usb_cleanup(void)
         destroy_workqueue(ksuspend_usb_wq);
 }
 
+/* USB device Power-Management thunks.
+ * There's no need to distinguish here between quiescing a USB device
+ * and powering it down; the generic_suspend() routine takes care of
+ * it by skipping the usb_port_suspend() call for a quiesce.  And for
+ * USB interfaces there's no difference at all.
+ */
+
+static int usb_dev_prepare(struct device *dev)
+{
+        return 0;               /* Implement eventually? */
+}
+
+static void usb_dev_complete(struct device *dev)
+{
+        /* Currently used only for rebinding interfaces */
+        usb_resume(dev);        /* Implement eventually? */
+}
+
+static int usb_dev_suspend(struct device *dev)
+{
+        return usb_suspend(dev, PMSG_SUSPEND);
+}
+
+static int usb_dev_resume(struct device *dev)
+{
+        return usb_resume(dev);
+}
+
+static int usb_dev_freeze(struct device *dev)
+{
+        return usb_suspend(dev, PMSG_FREEZE);
+}
+
+static int usb_dev_thaw(struct device *dev)
+{
+        return usb_resume(dev);
+}
+
+static int usb_dev_poweroff(struct device *dev)
+{
+        return usb_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int usb_dev_restore(struct device *dev)
+{
+        return usb_resume(dev);
+}
+
+static struct pm_ops usb_device_pm_ops = {
+        .prepare =      usb_dev_prepare,
+        .complete =     usb_dev_complete,
+        .suspend =      usb_dev_suspend,
+        .resume =       usb_dev_resume,
+        .freeze =       usb_dev_freeze,
+        .thaw =         usb_dev_thaw,
+        .poweroff =     usb_dev_poweroff,
+        .restore =      usb_dev_restore,
+};
+
 #else
 
 #define ksuspend_usb_init()     0
 #define ksuspend_usb_cleanup()  do {} while (0)
+#define usb_device_pm_ops       (*(struct pm_ops *)0)
 
 #endif  /* CONFIG_PM */
 
+struct device_type usb_device_type = {
+        .name =         "usb_device",
+        .release =      usb_release_dev,
+        .uevent =       usb_dev_uevent,
+        .pm =           &usb_device_pm_ops,
+};
+
 
 /* Returns 1 if @usb_bus is WUSB, 0 otherwise */
 static unsigned usb_bus_is_wusb(struct usb_bus *bus)
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index d9a6e16dbf84..9a1a45ac3add 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -41,6 +41,9 @@ extern void usb_host_cleanup(void);
 
 #ifdef  CONFIG_PM
 
+extern int usb_suspend(struct device *dev, pm_message_t msg);
+extern int usb_resume(struct device *dev);
+
 extern void usb_autosuspend_work(struct work_struct *work);
 extern int usb_port_suspend(struct usb_device *dev);
 extern int usb_port_resume(struct usb_device *dev);