USB: convert to the runtime PM framework

This patch (as1329) converts the USB stack over to the PM core's
runtime PM framework.  This involves numerous changes throughout
usbcore, especially to hub.c and driver.c.  Perhaps the most notable
change is that CONFIG_USB_SUSPEND now depends on CONFIG_PM_RUNTIME
instead of CONFIG_PM.

Several fields in the usb_device and usb_interface structures are no
longer needed.  Some code which used to depend on CONFIG_USB_PM now
depends on CONFIG_USB_SUSPEND (requiring some rearrangement of header
files).

The only visible change in behavior should be that following a system
sleep (resume from RAM or resume from hibernation), autosuspended USB
devices will be resumed just like everything else.  They won't remain
suspended.  But if they aren't in use then they will naturally
autosuspend again in a few seconds.

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

1 files changed, 3 insertions, 28 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index e6419ac89ea2..ad50fc8a7ad3 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -122,7 +122,6 @@ enum usb_interface_condition {
  *      number from the USB core by calling usb_register_dev().
  * @condition: binding state of the interface: not bound, binding
  *      (in probe()), bound to a driver, or unbinding (in disconnect())
- * @is_active: flag set when the interface is bound and not suspended.
  * @sysfs_files_created: sysfs attributes exist
  * @ep_devs_created: endpoint child pseudo-devices exist
  * @unregistering: flag set when the interface is being unregistered
@@ -135,8 +134,7 @@ enum usb_interface_condition {
  * @dev: driver model's view of this device
  * @usb_dev: if an interface is bound to the USB major, this will point
  *      to the sysfs representation for that device.
- * @pm_usage_cnt: PM usage counter for this interface; autosuspend is not
- *      allowed unless the counter is 0.
+ * @pm_usage_cnt: PM usage counter for this interface
  * @reset_ws: Used for scheduling resets from atomic context.
  * @reset_running: set to 1 if the interface is currently running a
  *      queued reset so that usb_cancel_queued_reset() doesn't try to
@@ -184,7 +182,6 @@ struct usb_interface {
         int minor;                      /* minor number this interface is
                                          * bound to */
         enum usb_interface_condition condition;         /* state of binding */
-        unsigned is_active:1;           /* the interface is not suspended */
         unsigned sysfs_files_created:1; /* the sysfs attributes exist */
         unsigned ep_devs_created:1;     /* endpoint "devices" exist */
         unsigned unregistering:1;       /* unregistration is in progress */
@@ -401,7 +398,6 @@ struct usb_tt;
  * @portnum: parent port number (origin 1)
  * @level: number of USB hub ancestors
  * @can_submit: URBs may be submitted
- * @discon_suspended: disconnected while suspended
  * @persist_enabled:  USB_PERSIST enabled for this device
  * @have_langid: whether string_langid is valid
  * @authorized: policy has said we can use it;
@@ -421,20 +417,15 @@ struct usb_tt;
  * @usbfs_dentry: usbfs dentry entry for the device
  * @maxchild: number of ports if hub
  * @children: child devices - USB devices that are attached to this hub
- * @pm_usage_cnt: usage counter for autosuspend
  * @quirks: quirks of the whole device
  * @urbnum: number of URBs submitted for the whole device
  * @active_duration: total time device is not suspended
- * @autosuspend: for delayed autosuspends
- * @autoresume: for autoresumes requested while in_interrupt
- * @pm_mutex: protects PM operations
  * @last_busy: time of last use
  * @autosuspend_delay: in jiffies
  * @connect_time: time device was first connected
  * @do_remote_wakeup:  remote wakeup should be enabled
  * @reset_resume: needs reset instead of resume
  * @autosuspend_disabled: autosuspend disabled by the user
- * @skip_sys_resume: skip the next system resume
  * @wusb_dev: if this is a Wireless USB device, link to the WUSB
  *      specific data for the device.
  * @slot_id: Slot ID assigned by xHCI
@@ -475,7 +466,6 @@ struct usb_device {
         u8 level;
 
         unsigned can_submit:1;
-        unsigned discon_suspended:1;
         unsigned persist_enabled:1;
         unsigned have_langid:1;
         unsigned authorized:1;
@@ -499,17 +489,12 @@ struct usb_device {
         int maxchild;
         struct usb_device *children[USB_MAXCHILDREN];
 
-        int pm_usage_cnt;
         u32 quirks;
         atomic_t urbnum;
 
         unsigned long active_duration;
 
 #ifdef CONFIG_PM
-        struct delayed_work autosuspend;
-        struct work_struct autoresume;
-        struct mutex pm_mutex;
-
         unsigned long last_busy;
         int autosuspend_delay;
         unsigned long connect_time;
@@ -517,7 +502,6 @@ struct usb_device {
         unsigned do_remote_wakeup:1;
         unsigned reset_resume:1;
         unsigned autosuspend_disabled:1;
-        unsigned skip_sys_resume:1;
 #endif
         struct wusb_dev *wusb_dev;
         int slot_id;
@@ -549,17 +533,8 @@ extern int usb_autopm_get_interface(struct usb_interface *intf);
 extern void usb_autopm_put_interface(struct usb_interface *intf);
 extern int usb_autopm_get_interface_async(struct usb_interface *intf);
 extern void usb_autopm_put_interface_async(struct usb_interface *intf);
-
-static inline void usb_autopm_get_interface_no_resume(
-                struct usb_interface *intf)
-{
-        atomic_inc(&intf->pm_usage_cnt);
-}
-static inline void usb_autopm_put_interface_no_suspend(
-                struct usb_interface *intf)
-{
-        atomic_dec(&intf->pm_usage_cnt);
-}
+extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
+extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
 
 static inline void usb_mark_last_busy(struct usb_device *udev)
 {