1 files changed, 368 insertions, 477 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 638d54693a1c..6850ec6576f8 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -25,7 +25,7 @@
 #include <linux/device.h>
 #include <linux/usb.h>
 #include <linux/usb/quirks.h>
-#include <linux/workqueue.h>
+#include <linux/pm_runtime.h>
 #include "hcd.h"
 #include "usb.h"
 
@@ -221,7 +221,7 @@ static int usb_probe_device(struct device *dev)
 {
         struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
         struct usb_device *udev = to_usb_device(dev);
-        int error = -ENODEV;
+        int error = 0;
 
         dev_dbg(dev, "%s\n", __func__);
 
@@ -230,18 +230,23 @@ static int usb_probe_device(struct device *dev)
         /* The device should always appear to be in use
          * unless the driver suports autosuspend.
          */
-        udev->pm_usage_cnt = !(udriver->supports_autosuspend);
+        if (!udriver->supports_autosuspend)
+                error = usb_autoresume_device(udev);
 
-        error = udriver->probe(udev);
+        if (!error)
+                error = udriver->probe(udev);
         return error;
 }
 
 /* called from driver core with dev locked */
 static int usb_unbind_device(struct device *dev)
 {
+        struct usb_device *udev = to_usb_device(dev);
         struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
 
-        udriver->disconnect(to_usb_device(dev));
+        udriver->disconnect(udev);
+        if (!udriver->supports_autosuspend)
+                usb_autosuspend_device(udev);
         return 0;
 }
 
@@ -293,17 +298,16 @@ static int usb_probe_interface(struct device *dev)
         if (error)
                 return error;
 
-        /* Interface "power state" doesn't correspond to any hardware
-         * state whatsoever.  We use it to record when it's bound to
-         * a driver that may start I/0:  it's not frozen/quiesced.
-         */
-        mark_active(intf);
         intf->condition = USB_INTERFACE_BINDING;
 
-        /* The interface should always appear to be in use
-         * unless the driver suports autosuspend.
+        /* Bound interfaces are initially active.  They are
+         * runtime-PM-enabled only if the driver has autosuspend support.
+         * They are sensitive to their children's power states.
          */
-        atomic_set(&intf->pm_usage_cnt, !driver->supports_autosuspend);
+        pm_runtime_set_active(dev);
+        pm_suspend_ignore_children(dev, false);
+        if (driver->supports_autosuspend)
+                pm_runtime_enable(dev);
 
         /* Carry out a deferred switch to altsetting 0 */
         if (intf->needs_altsetting0) {
@@ -323,10 +327,14 @@ static int usb_probe_interface(struct device *dev)
         return error;
 
  err:
-        mark_quiesced(intf);
         intf->needs_remote_wakeup = 0;
         intf->condition = USB_INTERFACE_UNBOUND;
         usb_cancel_queued_reset(intf);
+
+        /* Unbound interfaces are always runtime-PM-disabled and -suspended */
+        pm_runtime_disable(dev);
+        pm_runtime_set_suspended(dev);
+
         usb_autosuspend_device(udev);
         return error;
 }
@@ -376,9 +384,17 @@ static int usb_unbind_interface(struct device *dev)
         usb_set_intfdata(intf, NULL);
 
         intf->condition = USB_INTERFACE_UNBOUND;
-        mark_quiesced(intf);
         intf->needs_remote_wakeup = 0;
 
+        /* Unbound interfaces are always runtime-PM-disabled and -suspended */
+        pm_runtime_disable(dev);
+        pm_runtime_set_suspended(dev);
+
+        /* Undo any residual pm_autopm_get_interface_* calls */
+        for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r)
+                usb_autopm_put_interface_no_suspend(intf);
+        atomic_set(&intf->pm_usage_cnt, 0);
+
         if (!error)
                 usb_autosuspend_device(udev);
 
@@ -409,7 +425,6 @@ int usb_driver_claim_interface(struct usb_driver *driver,
                                 struct usb_interface *iface, void *priv)
 {
         struct device *dev = &iface->dev;
-        struct usb_device *udev = interface_to_usbdev(iface);
         int retval = 0;
 
         if (dev->driver)
@@ -419,11 +434,16 @@ int usb_driver_claim_interface(struct usb_driver *driver,
         usb_set_intfdata(iface, priv);
         iface->needs_binding = 0;
 
-        usb_pm_lock(udev);
         iface->condition = USB_INTERFACE_BOUND;
-        mark_active(iface);
-        atomic_set(&iface->pm_usage_cnt, !driver->supports_autosuspend);
-        usb_pm_unlock(udev);
+
+        /* Bound interfaces are initially active.  They are
+         * runtime-PM-enabled only if the driver has autosuspend support.
+         * They are sensitive to their children's power states.
+         */
+        pm_runtime_set_active(dev);
+        pm_suspend_ignore_children(dev, false);
+        if (driver->supports_autosuspend)
+                pm_runtime_enable(dev);
 
         /* if interface was already added, bind now; else let
          * the future device_add() bind it, bypassing probe()
@@ -982,7 +1002,6 @@ static void do_unbind_rebind(struct usb_device *udev, int action)
         }
 }
 
-/* Caller has locked udev's pm_mutex */
 static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
 {
         struct usb_device_driver        *udriver;
@@ -1006,7 +1025,6 @@ static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
         return status;
 }
 
-/* Caller has locked udev's pm_mutex */
 static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
 {
         struct usb_device_driver        *udriver;
@@ -1040,27 +1058,20 @@ static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
         return status;
 }
 
-/* Caller has locked intf's usb_device's pm mutex */
 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 (udev->state == USB_STATE_NOTATTACHED || !is_active(intf))
-                goto done;
-
-        /* This can happen; see usb_driver_release_interface() */
-        if (intf->condition == USB_INTERFACE_UNBOUND)
+        if (udev->state == USB_STATE_NOTATTACHED ||
+                        intf->condition == USB_INTERFACE_UNBOUND)
                 goto done;
         driver = to_usb_driver(intf->dev.driver);
 
         if (driver->suspend) {
                 status = driver->suspend(intf, msg);
-                if (status == 0)
-                        mark_quiesced(intf);
-                else if (!(msg.event & PM_EVENT_AUTO))
+                if (status && !(msg.event & PM_EVENT_AUTO))
                         dev_err(&intf->dev, "%s error %d\n",
                                         "suspend", status);
         } else {
@@ -1068,7 +1079,6 @@ static int usb_suspend_interface(struct usb_device *udev,
                 intf->needs_binding = 1;
                 dev_warn(&intf->dev, "no %s for driver %s?\n",
                                 "suspend", driver->name);
-                mark_quiesced(intf);
         }
 
  done:
@@ -1076,14 +1086,13 @@ static int usb_suspend_interface(struct usb_device *udev,
         return status;
 }
 
-/* Caller has locked intf's usb_device's pm_mutex */
 static int usb_resume_interface(struct usb_device *udev,
                 struct usb_interface *intf, pm_message_t msg, int reset_resume)
 {
         struct usb_driver       *driver;
         int                     status = 0;
 
-        if (udev->state == USB_STATE_NOTATTACHED || is_active(intf))
+        if (udev->state == USB_STATE_NOTATTACHED)
                 goto done;
 
         /* Don't let autoresume interfere with unbinding */
@@ -1134,90 +1143,11 @@ static int usb_resume_interface(struct usb_device *udev,
 
 done:
         dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
-        if (status == 0 && intf->condition == USB_INTERFACE_BOUND)
-                mark_active(intf);
 
         /* Later we will unbind the driver and/or reprobe, if necessary */
         return status;
 }
 
-#ifdef  CONFIG_USB_SUSPEND
-
-/* Internal routine to check whether we may autosuspend a device. */
-static int autosuspend_check(struct usb_device *udev, int reschedule)
-{
-        int                     i;
-        struct usb_interface    *intf;
-        unsigned long           suspend_time, j;
-
-        /* For autosuspend, fail fast if anything is in use or autosuspend
-         * is disabled.  Also fail if any interfaces require remote wakeup
-         * but it isn't available.
-         */
-        if (udev->pm_usage_cnt > 0)
-                return -EBUSY;
-        if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled)
-                return -EPERM;
-
-        suspend_time = udev->last_busy + udev->autosuspend_delay;
-        if (udev->actconfig) {
-                for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
-                        intf = udev->actconfig->interface[i];
-                        if (!is_active(intf))
-                                continue;
-                        if (atomic_read(&intf->pm_usage_cnt) > 0)
-                                return -EBUSY;
-                        if (intf->needs_remote_wakeup &&
-                                        !udev->do_remote_wakeup) {
-                                dev_dbg(&udev->dev, "remote wakeup needed "
-                                                "for autosuspend\n");
-                                return -EOPNOTSUPP;
-                        }
-
-                        /* Don't allow autosuspend if the device will need
-                         * a reset-resume and any of its interface drivers
-                         * doesn't include support.
-                         */
-                        if (udev->quirks & USB_QUIRK_RESET_RESUME) {
-                                struct usb_driver *driver;
-
-                                driver = to_usb_driver(intf->dev.driver);
-                                if (!driver->reset_resume ||
-                                    intf->needs_remote_wakeup)
-                                        return -EOPNOTSUPP;
-                        }
-                }
-        }
-
-        /* If everything is okay but the device hasn't been idle for long
-         * enough, queue a delayed autosuspend request.  If the device
-         * _has_ been idle for long enough and the reschedule flag is set,
-         * likewise queue a delayed (1 second) autosuspend request.
-         */
-        j = jiffies;
-        if (time_before(j, suspend_time))
-                reschedule = 1;
-        else
-                suspend_time = j + HZ;
-        if (reschedule) {
-                if (!timer_pending(&udev->autosuspend.timer)) {
-                        queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
-                                round_jiffies_up_relative(suspend_time - j));
-                }
-                return -EAGAIN;
-        }
-        return 0;
-}
-
-#else
-
-static inline int autosuspend_check(struct usb_device *udev, int reschedule)
-{
-        return 0;
-}
-
-#endif  /* CONFIG_USB_SUSPEND */
-
 /**
  * usb_suspend_both - suspend a USB device and its interfaces
  * @udev: the usb_device to suspend
@@ -1229,27 +1159,12 @@ static inline int autosuspend_check(struct usb_device *udev, int reschedule)
  * all the interfaces which were suspended are resumed so that they remain
  * in the same state as the device.
  *
- * If an autosuspend is in progress the routine checks first to make sure
- * that neither the device itself or any of its active interfaces is in use
- * (pm_usage_cnt is greater than 0).  If they are, the autosuspend fails.
- *
- * If the suspend succeeds, the routine recursively queues an autosuspend
- * request for @udev's parent device, thereby propagating the change up
- * the device tree.  If all of the parent's children are now suspended,
- * the parent will autosuspend in turn.
- *
- * The suspend method calls are subject to mutual exclusion under control
- * of @udev's pm_mutex.  Many of these calls are also under the protection
- * of @udev's device lock (including all requests originating outside the
- * USB subsystem), but autosuspend requests generated by a child device or
- * interface driver may not be.  Usbcore will insure that the method calls
- * do not arrive during bind, unbind, or reset operations.  However, drivers
- * must be prepared to handle suspend calls arriving at unpredictable times.
- * The only way to block such calls is to do an autoresume (preventing
- * autosuspends) while holding @udev's device lock (preventing outside
- * suspends).
- *
- * The caller must hold @udev->pm_mutex.
+ * Autosuspend requests originating from a child device or an interface
+ * driver may be made without the protection of @udev's device lock, but
+ * all other suspend calls will hold the lock.  Usbcore will insure that
+ * method calls do not arrive during bind, unbind, or reset operations.
+ * However drivers must be prepared to handle suspend calls arriving at
+ * unpredictable times.
  *
  * This routine can run only in process context.
  */
@@ -1258,20 +1173,11 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
         int                     status = 0;
         int                     i = 0;
         struct usb_interface    *intf;
-        struct usb_device       *parent = udev->parent;
 
         if (udev->state == USB_STATE_NOTATTACHED ||
                         udev->state == USB_STATE_SUSPENDED)
                 goto done;
 
-        udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
-
-        if (msg.event & PM_EVENT_AUTO) {
-                status = autosuspend_check(udev, 0);
-                if (status < 0)
-                        goto done;
-        }
-
         /* Suspend all the interfaces and then udev itself */
         if (udev->actconfig) {
                 for (; i < udev->actconfig->desc.bNumInterfaces; i++) {
@@ -1286,35 +1192,21 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
 
         /* If the suspend failed, resume interfaces that did get suspended */
         if (status != 0) {
-                pm_message_t msg2;
-
-                msg2.event = msg.event ^ (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
+                msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
                 while (--i >= 0) {
                         intf = udev->actconfig->interface[i];
-                        usb_resume_interface(udev, intf, msg2, 0);
+                        usb_resume_interface(udev, intf, msg, 0);
                 }
 
-                /* Try another autosuspend when the interfaces aren't busy */
-                if (msg.event & PM_EVENT_AUTO)
-                        autosuspend_check(udev, status == -EBUSY);
-
-        /* If the suspend succeeded then prevent any more URB submissions,
-         * flush any outstanding URBs, and propagate the suspend up the tree.
+        /* If the suspend succeeded then prevent any more URB submissions
+         * and flush any outstanding URBs.
          */
         } else {
-                cancel_delayed_work(&udev->autosuspend);
                 udev->can_submit = 0;
                 for (i = 0; i < 16; ++i) {
                         usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
                         usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
                 }
-
-                /* If this is just a FREEZE or a PRETHAW, udev might
-                 * not really be suspended.  Only true suspends get
-                 * propagated up the device tree.
-                 */
-                if (parent && udev->state == USB_STATE_SUSPENDED)
-                        usb_autosuspend_device(parent);
         }
 
  done:
@@ -1331,23 +1223,12 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
  * the resume method for @udev and then calls the resume methods for all
  * the interface drivers in @udev.
  *
- * Before starting the resume, the routine calls itself recursively for
- * the parent device of @udev, thereby propagating the change up the device
- * tree and assuring that @udev will be able to resume.  If the parent is
- * unable to resume successfully, the routine fails.
- *
- * The resume method calls are subject to mutual exclusion under control
- * of @udev's pm_mutex.  Many of these calls are also under the protection
- * of @udev's device lock (including all requests originating outside the
- * USB subsystem), but autoresume requests generated by a child device or
- * interface driver may not be.  Usbcore will insure that the method calls
- * do not arrive during bind, unbind, or reset operations.  However, drivers
- * must be prepared to handle resume calls arriving at unpredictable times.
- * The only way to block such calls is to do an autoresume (preventing
- * other autoresumes) while holding @udev's device lock (preventing outside
- * resumes).
- *
- * The caller must hold @udev->pm_mutex.
+ * Autoresume requests originating from a child device or an interface
+ * driver may be made without the protection of @udev's device lock, but
+ * all other resume calls will hold the lock.  Usbcore will insure that
+ * method calls do not arrive during bind, unbind, or reset operations.
+ * However drivers must be prepared to handle resume calls arriving at
+ * unpredictable times.
  *
  * This routine can run only in process context.
  */
@@ -1356,48 +1237,18 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
         int                     status = 0;
         int                     i;
         struct usb_interface    *intf;
-        struct usb_device       *parent = udev->parent;
 
-        cancel_delayed_work(&udev->autosuspend);
         if (udev->state == USB_STATE_NOTATTACHED) {
                 status = -ENODEV;
                 goto done;
         }
         udev->can_submit = 1;
 
-        /* Propagate the resume up the tree, if necessary */
-        if (udev->state == USB_STATE_SUSPENDED) {
-                if (parent) {
-                        status = usb_autoresume_device(parent);
-                        if (status == 0) {
-                                status = usb_resume_device(udev, msg);
-                                if (status || udev->state ==
-                                                USB_STATE_NOTATTACHED) {
-                                        usb_autosuspend_device(parent);
-
-                                        /* It's possible usb_resume_device()
-                                         * failed after the port was
-                                         * unsuspended, causing udev to be
-                                         * logically disconnected.  We don't
-                                         * want usb_disconnect() to autosuspend
-                                         * the parent again, so tell it that
-                                         * udev disconnected while still
-                                         * suspended. */
-                                        if (udev->state ==
-                                                        USB_STATE_NOTATTACHED)
-                                                udev->discon_suspended = 1;
-                                }
-                        }
-                } else {
-
-                        /* We can't progagate beyond the USB subsystem,
-                         * so if a root hub's controller is suspended
-                         * then we're stuck. */
-                        status = usb_resume_device(udev, msg);
-                }
-        } else if (udev->reset_resume)
+        /* Resume the device */
+        if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume)
                 status = usb_resume_device(udev, msg);
 
+        /* Resume the interfaces */
         if (status == 0 && udev->actconfig) {
                 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
                         intf = udev->actconfig->interface[i];
@@ -1413,104 +1264,46 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
         return status;
 }
 
-/**
- * usb_external_suspend_device - external suspend of a USB device and its interfaces
- * @udev: the usb_device to suspend
- * @msg: Power Management message describing this state transition
- *
- * This routine handles external suspend requests: ones not generated
- * internally by a USB driver (autosuspend) but rather coming from the user
- * (via sysfs) or the PM core (system sleep).  The suspend will be carried
- * out regardless of @udev's usage counter or those of its interfaces,
- * and regardless of whether or not remote wakeup is enabled.  Of course,
- * interface drivers still have the option of failing the suspend (if
- * there are unsuspended children, for example).
- *
- * The caller must hold @udev's device lock.
- */
-int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg)
-{
-        int     status;
-
-        do_unbind_rebind(udev, DO_UNBIND);
-        usb_pm_lock(udev);
-        status = usb_suspend_both(udev, msg);
-        usb_pm_unlock(udev);
-        return status;
-}
-
-/**
- * usb_external_resume_device - external resume of a USB device and its interfaces
- * @udev: the usb_device to resume
- * @msg: Power Management message describing this state transition
- *
- * This routine handles external resume requests: ones not generated
- * internally by a USB driver (autoresume) but rather coming from the user
- * (via sysfs), the PM core (system resume), or the device itself (remote
- * wakeup).  @udev's usage counter is unaffected.
- *
- * The caller must hold @udev's device lock.
- */
-int usb_external_resume_device(struct usb_device *udev, pm_message_t msg)
-{
-        int     status;
-
-        usb_pm_lock(udev);
-        status = usb_resume_both(udev, msg);
-        udev->last_busy = jiffies;
-        usb_pm_unlock(udev);
-        if (status == 0)
-                do_unbind_rebind(udev, DO_REBIND);
-
-        /* Now that the device is awake, we can start trying to autosuspend
-         * it again. */
-        if (status == 0)
-                usb_try_autosuspend_device(udev);
-        return status;
-}
-
+/* The device lock is held by the PM core */
 int usb_suspend(struct device *dev, pm_message_t msg)
 {
-        struct usb_device       *udev;
-
-        udev = to_usb_device(dev);
+        struct usb_device       *udev = to_usb_device(dev);
 
-        /* If udev is already suspended, we can skip this suspend and
-         * we should also skip the upcoming system resume.  High-speed
-         * root hubs are an exception; they need to resume whenever the
-         * system wakes up in order for USB-PERSIST port handover to work
-         * properly.
-         */
-        if (udev->state == USB_STATE_SUSPENDED) {
-                if (udev->parent || udev->speed != USB_SPEED_HIGH)
-                        udev->skip_sys_resume = 1;
-                return 0;
-        }
-
-        udev->skip_sys_resume = 0;
-        return usb_external_suspend_device(udev, msg);
+        do_unbind_rebind(udev, DO_UNBIND);
+        udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+        return usb_suspend_both(udev, msg);
 }
 
+/* The device lock is held by the PM core */
 int usb_resume(struct device *dev, pm_message_t msg)
 {
-        struct usb_device       *udev;
+        struct usb_device       *udev = to_usb_device(dev);
         int                     status;
 
-        udev = to_usb_device(dev);
+        /* For PM complete calls, all we do is rebind interfaces */
+        if (msg.event == PM_EVENT_ON) {
+                if (udev->state != USB_STATE_NOTATTACHED)
+                        do_unbind_rebind(udev, DO_REBIND);
+                status = 0;
 
-        /* If udev->skip_sys_resume is set then udev was already suspended
-         * when the system sleep started, so we don't want to resume it
-         * during this system wakeup.
+        /* For all other calls, take the device back to full power and
+         * tell the PM core in case it was autosuspended previously.
          */
-        if (udev->skip_sys_resume)
-                return 0;
-        status = usb_external_resume_device(udev, msg);
+        } else {
+                status = usb_resume_both(udev, msg);
+                if (status == 0) {
+                        pm_runtime_disable(dev);
+                        pm_runtime_set_active(dev);
+                        pm_runtime_enable(dev);
+                        udev->last_busy = jiffies;
+                }
+        }
 
         /* Avoid PM error messages for devices disconnected while suspended
          * as we'll display regular disconnect messages just a bit later.
          */
         if (status == -ENODEV)
-                return 0;
+                status = 0;
         return status;
 }
 
@@ -1560,54 +1353,6 @@ int usb_disable_autosuspend(struct usb_device *udev)
 }
 EXPORT_SYMBOL_GPL(usb_disable_autosuspend);
 
-/* Internal routine to adjust a device's usage counter and change
- * its autosuspend state.
- */
-static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
-{
-        int     status = 0;
-
-        usb_pm_lock(udev);
-        udev->pm_usage_cnt += inc_usage_cnt;
-        WARN_ON(udev->pm_usage_cnt < 0);
-        if (inc_usage_cnt)
-                udev->last_busy = jiffies;
-        if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
-                if (udev->state == USB_STATE_SUSPENDED)
-                        status = usb_resume_both(udev, PMSG_AUTO_RESUME);
-                if (status != 0)
-                        udev->pm_usage_cnt -= inc_usage_cnt;
-                else if (inc_usage_cnt)
-                        udev->last_busy = jiffies;
-        } else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
-                status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
-        }
-        usb_pm_unlock(udev);
-        return status;
-}
-
-/* usb_autosuspend_work - callback routine to autosuspend a USB device */
-void usb_autosuspend_work(struct work_struct *work)
-{
-        struct usb_device *udev =
-                container_of(work, struct usb_device, autosuspend.work);
-
-        usb_autopm_do_device(udev, 0);
-}
-
-/* usb_autoresume_work - callback routine to autoresume a USB device */
-void usb_autoresume_work(struct work_struct *work)
-{
-        struct usb_device *udev =
-                container_of(work, struct usb_device, autoresume);
-
-        /* Wake it up, let the drivers do their thing, and then put it
-         * back to sleep.
-         */
-        if (usb_autopm_do_device(udev, 1) == 0)
-                usb_autopm_do_device(udev, -1);
-}
-
 /**
  * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
  * @udev: the usb_device to autosuspend
@@ -1616,12 +1361,9 @@ void usb_autoresume_work(struct work_struct *work)
  * @udev and wants to allow it to autosuspend.  Examples would be when
  * @udev's device file in usbfs is closed or after a configuration change.
  *
- * @udev's usage counter is decremented.  If it or any of the usage counters
- * for an active interface is greater than 0, no autosuspend request will be
- * queued.  (If an interface driver does not support autosuspend then its
- * usage counter is permanently positive.)  Furthermore, if an interface
- * driver requires remote-wakeup capability during autosuspend but remote
- * wakeup is disabled, the autosuspend will fail.
+ * @udev's usage counter is decremented; if it drops to 0 and all the
+ * interfaces are inactive then a delayed autosuspend will be attempted.
+ * The attempt may fail (see autosuspend_check()).
  *
  * The caller must hold @udev's device lock.
  *
@@ -1631,9 +1373,11 @@ void usb_autosuspend_device(struct usb_device *udev)
 {
         int     status;
 
-        status = usb_autopm_do_device(udev, -1);
-        dev_vdbg(&udev->dev, "%s: cnt %d\n",
-                        __func__, udev->pm_usage_cnt);
+        udev->last_busy = jiffies;
+        status = pm_runtime_put_sync(&udev->dev);
+        dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&udev->dev.power.usage_count),
+                        status);
 }
 
 /**
@@ -1643,9 +1387,9 @@ void usb_autosuspend_device(struct usb_device *udev)
  * This routine should be called when a core subsystem thinks @udev may
  * be ready to autosuspend.
  *
- * @udev's usage counter left unchanged.  If it or any of the usage counters
- * for an active interface is greater than 0, or autosuspend is not allowed
- * for any other reason, no autosuspend request will be queued.
+ * @udev's usage counter left unchanged.  If it is 0 and all the interfaces
+ * are inactive then an autosuspend will be attempted.  The attempt may
+ * fail or be delayed.
  *
  * The caller must hold @udev's device lock.
  *
@@ -1653,9 +1397,12 @@ void usb_autosuspend_device(struct usb_device *udev)
  */
 void usb_try_autosuspend_device(struct usb_device *udev)
 {
-        usb_autopm_do_device(udev, 0);
-        dev_vdbg(&udev->dev, "%s: cnt %d\n",
-                        __func__, udev->pm_usage_cnt);
+        int     status;
+
+        status = pm_runtime_idle(&udev->dev);
+        dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&udev->dev.power.usage_count),
+                        status);
 }
 
 /**
@@ -1664,9 +1411,9 @@ void usb_try_autosuspend_device(struct usb_device *udev)
  *
  * This routine should be called when a core subsystem wants to use @udev
  * and needs to guarantee that it is not suspended.  No autosuspend will
- * occur until usb_autosuspend_device is called.  (Note that this will not
- * prevent suspend events originating in the PM core.)  Examples would be
- * when @udev's device file in usbfs is opened or when a remote-wakeup
+ * occur until usb_autosuspend_device() is called.  (Note that this will
+ * not prevent suspend events originating in the PM core.)  Examples would
+ * be when @udev's device file in usbfs is opened or when a remote-wakeup
  * request is received.
  *
  * @udev's usage counter is incremented to prevent subsequent autosuspends.
@@ -1680,42 +1427,14 @@ int usb_autoresume_device(struct usb_device *udev)
 {
         int     status;
 
-        status = usb_autopm_do_device(udev, 1);
-        dev_vdbg(&udev->dev, "%s: status %d cnt %d\n",
-                        __func__, status, udev->pm_usage_cnt);
-        return status;
-}
-
-/* Internal routine to adjust an interface's usage counter and change
- * its device's autosuspend state.
- */
-static int usb_autopm_do_interface(struct usb_interface *intf,
-                int inc_usage_cnt)
-{
-        struct usb_device       *udev = interface_to_usbdev(intf);
-        int                     status = 0;
-
-        usb_pm_lock(udev);
-        if (intf->condition == USB_INTERFACE_UNBOUND)
-                status = -ENODEV;
-        else {
-                atomic_add(inc_usage_cnt, &intf->pm_usage_cnt);
-                udev->last_busy = jiffies;
-                if (inc_usage_cnt >= 0 &&
-                                atomic_read(&intf->pm_usage_cnt) > 0) {
-                        if (udev->state == USB_STATE_SUSPENDED)
-                                status = usb_resume_both(udev,
-                                                PMSG_AUTO_RESUME);
-                        if (status != 0)
-                                atomic_sub(inc_usage_cnt, &intf->pm_usage_cnt);
-                        else
-                                udev->last_busy = jiffies;
-                } else if (inc_usage_cnt <= 0 &&
-                                atomic_read(&intf->pm_usage_cnt) <= 0) {
-                        status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
-                }
-        }
-        usb_pm_unlock(udev);
+        status = pm_runtime_get_sync(&udev->dev);
+        if (status < 0)
+                pm_runtime_put_sync(&udev->dev);
+        dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&udev->dev.power.usage_count),
+                        status);
+        if (status > 0)
+                status = 0;
         return status;
 }
 
@@ -1729,34 +1448,25 @@ static int usb_autopm_do_interface(struct usb_interface *intf,
  * closed.
  *
  * The routine decrements @intf's usage counter.  When the counter reaches
- * 0, a delayed autosuspend request for @intf's device is queued.  When
- * the delay expires, if @intf->pm_usage_cnt is still <= 0 along with all
- * the other usage counters for the sibling interfaces and @intf's
- * usb_device, the device and all its interfaces will be autosuspended.
- *
- * Note that @intf->pm_usage_cnt is owned by the interface driver.  The
- * core will not change its value other than the increment and decrement
- * in usb_autopm_get_interface and usb_autopm_put_interface.  The driver
- * may use this simple counter-oriented discipline or may set the value
- * any way it likes.
+ * 0, a delayed autosuspend request for @intf's device is attempted.  The
+ * attempt may fail (see autosuspend_check()).
  *
  * If the driver has set @intf->needs_remote_wakeup then autosuspend will
  * take place only if the device's remote-wakeup facility is enabled.
  *
- * Suspend method calls queued by this routine can arrive at any time
- * while @intf is resumed and its usage counter is equal to 0.  They are
- * not protected by the usb_device's lock but only by its pm_mutex.
- * Drivers must provide their own synchronization.
- *
  * This routine can run only in process context.
  */
 void usb_autopm_put_interface(struct usb_interface *intf)
 {
-        int     status;
+        struct usb_device       *udev = interface_to_usbdev(intf);
+        int                     status;
 
-        status = usb_autopm_do_interface(intf, -1);
-        dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
-                        __func__, status, atomic_read(&intf->pm_usage_cnt));
+        udev->last_busy = jiffies;
+        atomic_dec(&intf->pm_usage_cnt);
+        status = pm_runtime_put_sync(&intf->dev);
+        dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&intf->dev.power.usage_count),
+                        status);
 }
 EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
 
@@ -1764,11 +1474,11 @@ EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
  * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
  * @intf: the usb_interface whose counter should be decremented
  *
- * This routine does essentially the same thing as
- * usb_autopm_put_interface(): it decrements @intf's usage counter and
- * queues a delayed autosuspend request if the counter is <= 0.  The
- * difference is that it does not acquire the device's pm_mutex;
- * callers must handle all synchronization issues themselves.
+ * This routine does much the same thing as usb_autopm_put_interface():
+ * It decrements @intf's usage counter and schedules a delayed
+ * autosuspend request if the counter is <= 0.  The difference is that it
+ * does not perform any synchronization; callers should hold a private
+ * lock and handle all synchronization issues themselves.
  *
  * Typically a driver would call this routine during an URB's completion
  * handler, if no more URBs were pending.
@@ -1778,28 +1488,58 @@ EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
 void usb_autopm_put_interface_async(struct usb_interface *intf)
 {
         struct usb_device       *udev = interface_to_usbdev(intf);
+        unsigned long           last_busy;
         int                     status = 0;
 
-        if (intf->condition == USB_INTERFACE_UNBOUND) {
-                status = -ENODEV;
-        } else {
-                udev->last_busy = jiffies;
-                atomic_dec(&intf->pm_usage_cnt);
-                if (udev->autosuspend_disabled || udev->autosuspend_delay < 0)
-                        status = -EPERM;
-                else if (atomic_read(&intf->pm_usage_cnt) <= 0 &&
-                                !timer_pending(&udev->autosuspend.timer)) {
-                        queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
+        last_busy = udev->last_busy;
+        udev->last_busy = jiffies;
+        atomic_dec(&intf->pm_usage_cnt);
+        pm_runtime_put_noidle(&intf->dev);
+
+        if (!udev->autosuspend_disabled) {
+                /* Optimization: Don't schedule a delayed autosuspend if
+                 * the timer is already running and the expiration time
+                 * wouldn't change.
+                 *
+                 * We have to use the interface's timer.  Attempts to
+                 * schedule a suspend for the device would fail because
+                 * the interface is still active.
+                 */
+                if (intf->dev.power.timer_expires == 0 ||
+                                round_jiffies_up(last_busy) !=
+                                round_jiffies_up(jiffies)) {
+                        status = pm_schedule_suspend(&intf->dev,
+                                        jiffies_to_msecs(
                                         round_jiffies_up_relative(
-                                                udev->autosuspend_delay));
+                                                udev->autosuspend_delay)));
                 }
         }
-        dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
-                        __func__, status, atomic_read(&intf->pm_usage_cnt));
+        dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&intf->dev.power.usage_count),
+                        status);
 }
 EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
 
 /**
+ * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be decremented
+ *
+ * This routine decrements @intf's usage counter but does not carry out an
+ * autosuspend.
+ *
+ * This routine can run in atomic context.
+ */
+void usb_autopm_put_interface_no_suspend(struct usb_interface *intf)
+{
+        struct usb_device       *udev = interface_to_usbdev(intf);
+
+        udev->last_busy = jiffies;
+        atomic_dec(&intf->pm_usage_cnt);
+        pm_runtime_put_noidle(&intf->dev);
+}
+EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend);
+
+/**
  * usb_autopm_get_interface - increment a USB interface's PM-usage counter
  * @intf: the usb_interface whose counter should be incremented
  *
@@ -1811,25 +1551,8 @@ EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
  * or @intf is unbound.  A typical example would be a character-device
  * driver when its device file is opened.
  *
- *
- * The routine increments @intf's usage counter.  (However if the
- * autoresume fails then the counter is re-decremented.)  So long as the
- * counter is greater than 0, autosuspend will not be allowed for @intf
- * or its usb_device.  When the driver is finished using @intf it should
- * call usb_autopm_put_interface() to decrement the usage counter and
- * queue a delayed autosuspend request (if the counter is <= 0).
- *
- *
- * Note that @intf->pm_usage_cnt is owned by the interface driver.  The
- * core will not change its value other than the increment and decrement
- * in usb_autopm_get_interface and usb_autopm_put_interface.  The driver
- * may use this simple counter-oriented discipline or may set the value
- * any way it likes.
- *
- * Resume method calls generated by this routine can arrive at any time
- * while @intf is suspended.  They are not protected by the usb_device's
- * lock but only by its pm_mutex.  Drivers must provide their own
- * synchronization.
+ * @intf's usage counter is incremented to prevent subsequent autosuspends.
+ * However if the autoresume fails then the counter is re-decremented.
  *
  * This routine can run only in process context.
  */
@@ -1837,9 +1560,16 @@ int usb_autopm_get_interface(struct usb_interface *intf)
 {
         int     status;
 
-        status = usb_autopm_do_interface(intf, 1);
-        dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
-                        __func__, status, atomic_read(&intf->pm_usage_cnt));
+        status = pm_runtime_get_sync(&intf->dev);
+        if (status < 0)
+                pm_runtime_put_sync(&intf->dev);
+        else
+                atomic_inc(&intf->pm_usage_cnt);
+        dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&intf->dev.power.usage_count),
+                        status);
+        if (status > 0)
+                status = 0;
         return status;
 }
 EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
@@ -1849,41 +1579,201 @@ EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
  * @intf: the usb_interface whose counter should be incremented
  *
  * This routine does much the same thing as
- * usb_autopm_get_interface(): it increments @intf's usage counter and
- * queues an autoresume request if the result is > 0.  The differences
- * are that it does not acquire the device's pm_mutex (callers must
- * handle all synchronization issues themselves), and it does not
- * autoresume the device directly (it only queues a request).  After a
- * successful call, the device will generally not yet be resumed.
+ * usb_autopm_get_interface(): It increments @intf's usage counter and
+ * queues an autoresume request if the device is suspended.  The
+ * differences are that it does not perform any synchronization (callers
+ * should hold a private lock and handle all synchronization issues
+ * themselves), and it does not autoresume the device directly (it only
+ * queues a request).  After a successful call, the device may not yet be
+ * resumed.
  *
  * This routine can run in atomic context.
  */
 int usb_autopm_get_interface_async(struct usb_interface *intf)
 {
-        struct usb_device       *udev = interface_to_usbdev(intf);
-        int                     status = 0;
+        int             status = 0;
+        enum rpm_status s;
 
-        if (intf->condition == USB_INTERFACE_UNBOUND)
-                status = -ENODEV;
-        else {
+        /* Don't request a resume unless the interface is already suspending
+         * or suspended.  Doing so would force a running suspend timer to be
+         * cancelled.
+         */
+        pm_runtime_get_noresume(&intf->dev);
+        s = ACCESS_ONCE(intf->dev.power.runtime_status);
+        if (s == RPM_SUSPENDING || s == RPM_SUSPENDED)
+                status = pm_request_resume(&intf->dev);
+
+        if (status < 0 && status != -EINPROGRESS)
+                pm_runtime_put_noidle(&intf->dev);
+        else
                 atomic_inc(&intf->pm_usage_cnt);
-                if (atomic_read(&intf->pm_usage_cnt) > 0 &&
-                                udev->state == USB_STATE_SUSPENDED)
-                        queue_work(ksuspend_usb_wq, &udev->autoresume);
-        }
-        dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
-                        __func__, status, atomic_read(&intf->pm_usage_cnt));
+        dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+                        __func__, atomic_read(&intf->dev.power.usage_count),
+                        status);
+        if (status > 0)
+                status = 0;
         return status;
 }
 EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async);
 
-#else
+/**
+ * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be incremented
+ *
+ * This routine increments @intf's usage counter but does not carry out an
+ * autoresume.
+ *
+ * This routine can run in atomic context.
+ */
+void usb_autopm_get_interface_no_resume(struct usb_interface *intf)
+{
+        struct usb_device       *udev = interface_to_usbdev(intf);
+
+        udev->last_busy = jiffies;
+        atomic_inc(&intf->pm_usage_cnt);
+        pm_runtime_get_noresume(&intf->dev);
+}
+EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume);
+
+/* Internal routine to check whether we may autosuspend a device. */
+static int autosuspend_check(struct usb_device *udev)
+{
+        int                     i;
+        struct usb_interface    *intf;
+        unsigned long           suspend_time, j;
+
+        /* Fail if autosuspend is disabled, or any interfaces are in use, or
+         * any interface drivers require remote wakeup but it isn't available.
+         */
+        udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+        if (udev->actconfig) {
+                for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+                        intf = udev->actconfig->interface[i];
+
+                        /* We don't need to check interfaces that are
+                         * disabled for runtime PM.  Either they are unbound
+                         * or else their drivers don't support autosuspend
+                         * and so they are permanently active.
+                         */
+                        if (intf->dev.power.disable_depth)
+                                continue;
+                        if (atomic_read(&intf->dev.power.usage_count) > 0)
+                                return -EBUSY;
+                        if (intf->needs_remote_wakeup &&
+                                        !udev->do_remote_wakeup) {
+                                dev_dbg(&udev->dev, "remote wakeup needed "
+                                                "for autosuspend\n");
+                                return -EOPNOTSUPP;
+                        }
+
+                        /* Don't allow autosuspend if the device will need
+                         * a reset-resume and any of its interface drivers
+                         * doesn't include support or needs remote wakeup.
+                         */
+                        if (udev->quirks & USB_QUIRK_RESET_RESUME) {
+                                struct usb_driver *driver;
+
+                                driver = to_usb_driver(intf->dev.driver);
+                                if (!driver->reset_resume ||
+                                                intf->needs_remote_wakeup)
+                                        return -EOPNOTSUPP;
+                        }
+                }
+        }
+
+        /* If everything is okay but the device hasn't been idle for long
+         * enough, queue a delayed autosuspend request.
+         */
+        j = ACCESS_ONCE(jiffies);
+        suspend_time = udev->last_busy + udev->autosuspend_delay;
+        if (time_before(j, suspend_time)) {
+                pm_schedule_suspend(&udev->dev, jiffies_to_msecs(
+                                round_jiffies_up_relative(suspend_time - j)));
+                return -EAGAIN;
+        }
+        return 0;
+}
+
+static int usb_runtime_suspend(struct device *dev)
+{
+        int     status = 0;
 
-void usb_autosuspend_work(struct work_struct *work)
-{}
+        /* A USB device can be suspended if it passes the various autosuspend
+         * checks.  Runtime suspend for a USB device means suspending all the
+         * interfaces and then the device itself.
+         */
+        if (is_usb_device(dev)) {
+                struct usb_device       *udev = to_usb_device(dev);
+
+                if (autosuspend_check(udev) != 0)
+                        return -EAGAIN;
+
+                status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
+
+                /* If an interface fails the suspend, adjust the last_busy
+                 * time so that we don't get another suspend attempt right
+                 * away.
+                 */
+                if (status) {
+                        udev->last_busy = jiffies +
+                                        (udev->autosuspend_delay == 0 ?
+                                                HZ/2 : 0);
+                }
+
+                /* Prevent the parent from suspending immediately after */
+                else if (udev->parent) {
+                        udev->parent->last_busy = jiffies;
+                }
+        }
+
+        /* Runtime suspend for a USB interface doesn't mean anything. */
+        return status;
+}
+
+static int usb_runtime_resume(struct device *dev)
+{
+        /* Runtime resume for a USB device means resuming both the device
+         * and all its interfaces.
+         */
+        if (is_usb_device(dev)) {
+                struct usb_device       *udev = to_usb_device(dev);
+                int                     status;
+
+                status = usb_resume_both(udev, PMSG_AUTO_RESUME);
+                udev->last_busy = jiffies;
+                return status;
+        }
+
+        /* Runtime resume for a USB interface doesn't mean anything. */
+        return 0;
+}
+
+static int usb_runtime_idle(struct device *dev)
+{
+        /* An idle USB device can be suspended if it passes the various
+         * autosuspend checks.  An idle interface can be suspended at
+         * any time.
+         */
+        if (is_usb_device(dev)) {
+                struct usb_device       *udev = to_usb_device(dev);
+
+                if (autosuspend_check(udev) != 0)
+                        return 0;
+        }
+
+        pm_runtime_suspend(dev);
+        return 0;
+}
+
+static struct dev_pm_ops usb_bus_pm_ops = {
+        .runtime_suspend =      usb_runtime_suspend,
+        .runtime_resume =       usb_runtime_resume,
+        .runtime_idle =         usb_runtime_idle,
+};
+
+#else
 
-void usb_autoresume_work(struct work_struct *work)
-{}
+#define usb_bus_pm_ops  (*(struct dev_pm_ops *) NULL)
 
 #endif /* CONFIG_USB_SUSPEND */
 
@@ -1891,4 +1781,5 @@ struct bus_type usb_bus_type = {
         .name =         "usb",
         .match =        usb_device_match,
         .uevent =       usb_uevent,
+        .pm =           &usb_bus_pm_ops,
 };