1 files changed, 69 insertions, 68 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 73c49362cd4..8586817698a 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -29,13 +29,6 @@
 #include "hcd.h"
 #include "usb.h"
 
-#define VERBOSE_DEBUG   0
-
-#if VERBOSE_DEBUG
-#define dev_vdbg        dev_dbg
-#else
-#define dev_vdbg(dev, fmt, args...)     do { } while (0)
-#endif
 
 #ifdef CONFIG_HOTPLUG
 
@@ -67,7 +60,7 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids,
         dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 
         spin_lock(&dynids->lock);
-        list_add_tail(&dynids->list, &dynid->node);
+        list_add_tail(&dynid->node, &dynids->list);
         spin_unlock(&dynids->lock);
 
         if (get_driver(driver)) {
@@ -209,6 +202,11 @@ static int usb_probe_interface(struct device *dev)
         intf = to_usb_interface(dev);
         udev = interface_to_usbdev(intf);
 
+        if (udev->authorized == 0) {
+                dev_err(&intf->dev, "Device is not authorized for usage\n");
+                return -ENODEV;
+        }
+
         id = usb_match_id(intf, driver->id_table);
         if (!id)
                 id = usb_match_dynamic_id(intf, driver);
@@ -583,12 +581,9 @@ static int usb_device_match(struct device *dev, struct device_driver *drv)
 }
 
 #ifdef  CONFIG_HOTPLUG
-static int usb_uevent(struct device *dev, char **envp, int num_envp,
-                      char *buffer, int buffer_size)
+static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         struct usb_device *usb_dev;
-        int i = 0;
-        int length = 0;
 
         if (!dev)
                 return -ENODEV;
@@ -617,51 +612,39 @@ static int usb_uevent(struct device *dev, char **envp, int num_envp,
          * all the device descriptors we don't tell them about.  Or
          * act as usermode drivers.
          */
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "DEVICE=/proc/bus/usb/%03d/%03d",
+        if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d",
                            usb_dev->bus->busnum, usb_dev->devnum))
                 return -ENOMEM;
 #endif
 
         /* per-device configurations are common */
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "PRODUCT=%x/%x/%x",
+        if (add_uevent_var(env, "PRODUCT=%x/%x/%x",
                            le16_to_cpu(usb_dev->descriptor.idVendor),
                            le16_to_cpu(usb_dev->descriptor.idProduct),
                            le16_to_cpu(usb_dev->descriptor.bcdDevice)))
                 return -ENOMEM;
 
         /* class-based driver binding models */
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "TYPE=%d/%d/%d",
+        if (add_uevent_var(env, "TYPE=%d/%d/%d",
                            usb_dev->descriptor.bDeviceClass,
                            usb_dev->descriptor.bDeviceSubClass,
                            usb_dev->descriptor.bDeviceProtocol))
                 return -ENOMEM;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "BUSNUM=%03d",
+        if (add_uevent_var(env, "BUSNUM=%03d",
                            usb_dev->bus->busnum))
                 return -ENOMEM;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "DEVNUM=%03d",
+        if (add_uevent_var(env, "DEVNUM=%03d",
                            usb_dev->devnum))
                 return -ENOMEM;
 
-        envp[i] = NULL;
         return 0;
 }
 
 #else
 
-static int usb_uevent(struct device *dev, char **envp,
-                      int num_envp, char *buffer, int buffer_size)
+static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         return -ENODEV;
 }
@@ -952,11 +935,11 @@ done:
 #ifdef  CONFIG_USB_SUSPEND
 
 /* Internal routine to check whether we may autosuspend a device. */
-static int autosuspend_check(struct usb_device *udev)
+static int autosuspend_check(struct usb_device *udev, int reschedule)
 {
         int                     i;
         struct usb_interface    *intf;
-        unsigned long           suspend_time;
+        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
@@ -998,20 +981,20 @@ static int autosuspend_check(struct usb_device *udev)
         }
 
         /* If everything is okay but the device hasn't been idle for long
-         * enough, queue a delayed autosuspend request.
+         * 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.
          */
-        if (time_after(suspend_time, jiffies)) {
+        j = jiffies;
+        if (time_before(j, suspend_time))
+                reschedule = 1;
+        else
+                suspend_time = j + HZ;
+        if (reschedule) {
                 if (!timer_pending(&udev->autosuspend.timer)) {
-
-                        /* The value of jiffies may change between the
-                         * time_after() comparison above and the subtraction
-                         * below.  That's okay; the system behaves sanely
-                         * when a timer is registered for the present moment
-                         * or for the past.
-                         */
                         queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
-                                round_jiffies_relative(suspend_time - jiffies));
-                        }
+                                round_jiffies_relative(suspend_time - j));
+                }
                 return -EAGAIN;
         }
         return 0;
@@ -1019,7 +1002,7 @@ static int autosuspend_check(struct usb_device *udev)
 
 #else
 
-static inline int autosuspend_check(struct usb_device *udev)
+static inline int autosuspend_check(struct usb_device *udev, int reschedule)
 {
         return 0;
 }
@@ -1076,7 +1059,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
         udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
 
         if (udev->auto_pm) {
-                status = autosuspend_check(udev);
+                status = autosuspend_check(udev, 0);
                 if (status < 0)
                         goto done;
         }
@@ -1090,15 +1073,8 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
                                 break;
                 }
         }
-        if (status == 0) {
-
-                /* Non-root devices don't need to do anything for FREEZE
-                 * or PRETHAW. */
-                if (udev->parent && (msg.event == PM_EVENT_FREEZE ||
-                                msg.event == PM_EVENT_PRETHAW))
-                        goto done;
+        if (status == 0)
                 status = usb_suspend_device(udev, msg);
-        }
 
         /* If the suspend failed, resume interfaces that did get suspended */
         if (status != 0) {
@@ -1109,12 +1085,24 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
 
                 /* Try another autosuspend when the interfaces aren't busy */
                 if (udev->auto_pm)
-                        autosuspend_check(udev);
+                        autosuspend_check(udev, status == -EBUSY);
 
-        /* If the suspend succeeded, propagate it up the tree */
+        /* If the suspend succeeded then prevent any more URB submissions,
+         * flush any outstanding URBs, and propagate the suspend up the tree.
+         */
         } else {
                 cancel_delayed_work(&udev->autosuspend);
-                if (parent)
+                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);
         }
 
@@ -1163,6 +1151,7 @@ static int usb_resume_both(struct usb_device *udev)
                 status = -ENODEV;
                 goto done;
         }
+        udev->can_submit = 1;
 
         /* Propagate the resume up the tree, if necessary */
         if (udev->state == USB_STATE_SUSPENDED) {
@@ -1231,6 +1220,8 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
         udev->auto_pm = 1;
         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);
@@ -1239,8 +1230,6 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
                 else if (inc_usage_cnt)
                         udev->last_busy = jiffies;
         } else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
-                if (inc_usage_cnt)
-                        udev->last_busy = jiffies;
                 status = usb_suspend_both(udev, PMSG_SUSPEND);
         }
         usb_pm_unlock(udev);
@@ -1349,16 +1338,15 @@ static int usb_autopm_do_interface(struct usb_interface *intf,
         else {
                 udev->auto_pm = 1;
                 intf->pm_usage_cnt += inc_usage_cnt;
+                udev->last_busy = jiffies;
                 if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) {
                         if (udev->state == USB_STATE_SUSPENDED)
                                 status = usb_resume_both(udev);
                         if (status != 0)
                                 intf->pm_usage_cnt -= inc_usage_cnt;
-                        else if (inc_usage_cnt)
+                        else
                                 udev->last_busy = jiffies;
                 } else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) {
-                        if (inc_usage_cnt)
-                                udev->last_busy = jiffies;
                         status = usb_suspend_both(udev, PMSG_SUSPEND);
                 }
         }
@@ -1537,9 +1525,21 @@ int usb_external_resume_device(struct usb_device *udev)
 
 static 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;
-        return usb_external_suspend_device(to_usb_device(dev), message);
+        udev = to_usb_device(dev);
+
+        /* If udev is already suspended, we can skip this suspend and
+         * we should also skip the upcoming system resume. */
+        if (udev->state == USB_STATE_SUSPENDED) {
+                udev->skip_sys_resume = 1;
+                return 0;
+        }
+
+        udev->skip_sys_resume = 0;
+        return usb_external_suspend_device(udev, message);
 }
 
 static int usb_resume(struct device *dev)
@@ -1550,13 +1550,14 @@ static int usb_resume(struct device *dev)
                 return 0;
         udev = to_usb_device(dev);
 
-        /* If autoresume is disabled then we also want to prevent resume
-         * during system wakeup.  However, a "persistent-device" reset-resume
-         * after power loss counts as a wakeup event.  So allow a
-         * reset-resume to occur if remote wakeup is enabled. */
-        if (udev->autoresume_disabled) {
+        /* If udev->skip_sys_resume is set then udev was already suspended
+         * when the system suspend started, so we don't want to resume
+         * udev during this system wakeup.  However a reset-resume counts
+         * as a wakeup event, so allow a reset-resume to occur if remote
+         * wakeup is enabled. */
+        if (udev->skip_sys_resume) {
                 if (!(udev->reset_resume && udev->do_remote_wakeup))
-                        return -EPERM;
+                        return -EHOSTUNREACH;
         }
         return usb_external_resume_device(udev);
 }