USB: fix autosuspend when CONFIG_PM isn't set

This patch (as791b) fixes things up to avoid compiler warnings or
errors when CONFIG_USB_SUSPEND or CONFIG_PM isn't set.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 42 insertions, 26 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index ee18d187ca17..113e484c763e 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -303,11 +303,11 @@ int usb_driver_claim_interface(struct usb_driver *driver,
         dev->driver = &driver->drvwrap.driver;
         usb_set_intfdata(iface, priv);
 
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         iface->condition = USB_INTERFACE_BOUND;
         mark_active(iface);
         iface->pm_usage_cnt = !(driver->supports_autosuspend);
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
 
         /* if interface was already added, bind now; else let
          * the future device_add() bind it, bypassing probe()
@@ -356,11 +356,11 @@ void usb_driver_release_interface(struct usb_driver *driver,
         dev->driver = NULL;
         usb_set_intfdata(iface, NULL);
 
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         iface->condition = USB_INTERFACE_UNBOUND;
         mark_quiesced(iface);
         iface->needs_remote_wakeup = 0;
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
 }
 EXPORT_SYMBOL(usb_driver_release_interface);
 
@@ -789,7 +789,7 @@ EXPORT_SYMBOL_GPL_FUTURE(usb_deregister);
 
 #ifdef CONFIG_PM
 
-/* Caller has locked udev->pm_mutex */
+/* Caller has locked udev's pm_mutex */
 static int suspend_device(struct usb_device *udev, pm_message_t msg)
 {
         struct usb_device_driver        *udriver;
@@ -816,7 +816,7 @@ done:
         return status;
 }
 
-/* Caller has locked udev->pm_mutex */
+/* Caller has locked udev's pm_mutex */
 static int resume_device(struct usb_device *udev)
 {
         struct usb_device_driver        *udriver;
@@ -842,7 +842,7 @@ done:
         return status;
 }
 
-/* Caller has locked intf's usb_device's pm_mutex */
+/* Caller has locked intf's usb_device's pm mutex */
 static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
 {
         struct usb_driver       *driver;
@@ -1064,7 +1064,7 @@ int usb_resume_both(struct usb_device *udev)
         /* Propagate the resume up the tree, if necessary */
         if (udev->state == USB_STATE_SUSPENDED) {
                 if (parent) {
-                        mutex_lock_nested(&parent->pm_mutex, parent->level);
+                        usb_pm_lock(parent);
                         parent->auto_pm = 1;
                         status = usb_resume_both(parent);
                 } else {
@@ -1079,7 +1079,7 @@ int usb_resume_both(struct usb_device *udev)
                 if (status == 0)
                         status = resume_device(udev);
                 if (parent)
-                        mutex_unlock(&parent->pm_mutex);
+                        usb_pm_unlock(parent);
         } else {
 
                 /* Needed only for setting udev->dev.power.power_state.event
@@ -1129,12 +1129,12 @@ int usb_resume_both(struct usb_device *udev)
  */
 void usb_autosuspend_device(struct usb_device *udev, int dec_usage_cnt)
 {
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         udev->pm_usage_cnt -= dec_usage_cnt;
         if (udev->pm_usage_cnt <= 0)
                 queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
                                 USB_AUTOSUSPEND_DELAY);
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
         // dev_dbg(&udev->dev, "%s: cnt %d\n",
         //              __FUNCTION__, udev->pm_usage_cnt);
 }
@@ -1168,13 +1168,13 @@ int usb_autoresume_device(struct usb_device *udev, int inc_usage_cnt)
 {
         int     status;
 
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         udev->pm_usage_cnt += inc_usage_cnt;
         udev->auto_pm = 1;
         status = usb_resume_both(udev);
         if (status != 0)
                 udev->pm_usage_cnt -= inc_usage_cnt;
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
         // dev_dbg(&udev->dev, "%s: status %d cnt %d\n",
         //              __FUNCTION__, status, udev->pm_usage_cnt);
         return status;
@@ -1215,13 +1215,13 @@ void usb_autopm_put_interface(struct usb_interface *intf)
 {
         struct usb_device       *udev = interface_to_usbdev(intf);
 
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         if (intf->condition != USB_INTERFACE_UNBOUND &&
                         --intf->pm_usage_cnt <= 0) {
                 queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
                                 USB_AUTOSUSPEND_DELAY);
         }
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
         // dev_dbg(&intf->dev, "%s: cnt %d\n",
         //              __FUNCTION__, intf->pm_usage_cnt);
 }
@@ -1263,7 +1263,7 @@ int usb_autopm_get_interface(struct usb_interface *intf)
         struct usb_device       *udev = interface_to_usbdev(intf);
         int                     status;
 
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         if (intf->condition == USB_INTERFACE_UNBOUND)
                 status = -ENODEV;
         else {
@@ -1273,7 +1273,7 @@ int usb_autopm_get_interface(struct usb_interface *intf)
                 if (status != 0)
                         --intf->pm_usage_cnt;
         }
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
         // dev_dbg(&intf->dev, "%s: status %d cnt %d\n",
         //              __FUNCTION__, status, intf->pm_usage_cnt);
         return status;
@@ -1289,10 +1289,10 @@ static int usb_suspend(struct device *dev, pm_message_t message)
         if (is_usb_device(dev)) {
                 struct usb_device *udev = to_usb_device(dev);
 
-                mutex_lock_nested(&udev->pm_mutex, udev->level);
+                usb_pm_lock(udev);
                 udev->auto_pm = 0;
                 status = usb_suspend_both(udev, message);
-                mutex_unlock(&udev->pm_mutex);
+                usb_pm_unlock(udev);
         } else
                 status = 0;
         return status;
@@ -1305,10 +1305,10 @@ static int usb_resume(struct device *dev)
         if (is_usb_device(dev)) {
                 struct usb_device *udev = to_usb_device(dev);
 
-                mutex_lock_nested(&udev->pm_mutex, udev->level);
+                usb_pm_lock(udev);
                 udev->auto_pm = 0;
                 status = usb_resume_both(udev);
-                mutex_unlock(&udev->pm_mutex);
+                usb_pm_unlock(udev);
 
                 /* Rebind drivers that had no suspend method? */
         } else
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 2a8cb3c2b19c..7676690a0386 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1779,7 +1779,7 @@ static int remote_wakeup(struct usb_device *udev)
          * to the parent hub! */
 
         usb_lock_device(udev);
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         if (udev->state == USB_STATE_SUSPENDED) {
                 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
                 /* TRSMRCY = 10 msec */
@@ -1788,7 +1788,7 @@ static int remote_wakeup(struct usb_device *udev)
                 if (status == 0)
                         udev->dev.power.power_state.event = PM_EVENT_ON;
         }
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
 
         if (status == 0)
                 usb_autoresume_device(udev, 0);
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 239f8e5d247f..e4df9edf1bc0 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -214,10 +214,10 @@ static void usb_autosuspend_work(void *_udev)
 {
         struct usb_device       *udev = _udev;
 
-        mutex_lock_nested(&udev->pm_mutex, udev->level);
+        usb_pm_lock(udev);
         udev->auto_pm = 1;
         usb_suspend_both(udev, PMSG_SUSPEND);
-        mutex_unlock(&udev->pm_mutex);
+        usb_pm_unlock(udev);
 }
 
 #else
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index fb6eb41c374f..f69df137ec0e 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -36,6 +36,16 @@ extern int usb_resume_both(struct usb_device *udev);
 extern int usb_port_suspend(struct usb_device *dev);
 extern int usb_port_resume(struct usb_device *dev);
 
+static inline void usb_pm_lock(struct usb_device *udev)
+{
+        mutex_lock_nested(&udev->pm_mutex, udev->level);
+}
+
+static inline void usb_pm_unlock(struct usb_device *udev)
+{
+        mutex_unlock(&udev->pm_mutex);
+}
+
 #else
 
 #define usb_suspend_both(udev, msg)     0
@@ -45,6 +55,8 @@ static inline int usb_resume_both(struct usb_device *udev)
 }
 #define usb_port_suspend(dev)           0
 #define usb_port_resume(dev)            0
+static inline void usb_pm_lock(struct usb_device *udev) {}
+static inline void usb_pm_unlock(struct usb_device *udev) {}
 
 #endif
 
@@ -58,7 +70,11 @@ extern int usb_autoresume_device(struct usb_device *udev, int inc_busy_cnt);
 #else
 
 #define usb_autosuspend_device(udev, dec_busy_cnt)      do {} while (0)
-#define usb_autoresume_device(udev, inc_busy_cnt)       0
+static inline int usb_autoresume_device(struct usb_device *udev,
+                int inc_busy_cnt)
+{
+        return 0;
+}
 
 #endif