USB: remove the auto_pm flag

This patch (as1302) removes the auto_pm flag from struct usb_device.
The flag's only purpose was to distinguish between autosuspends and
external suspends, but that information is now available in the
pm_message_t argument passed to suspend methods.

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

8 files changed, 14 insertions, 22 deletions

diff --git a/Documentation/usb/power-management.txt b/Documentation/usb/power-management.txt
index ad64261..8817368 100644
--- a/Documentation/usb/power-management.txt
+++ b/Documentation/usb/power-management.txt
@@ -423,15 +423,16 @@ an URB had completed too recently.
 
 External suspend calls should never be allowed to fail in this way,
 only autosuspend calls.  The driver can tell them apart by checking
-udev->auto_pm; this flag will be set to 1 for internal PM events
-(autosuspend or autoresume) and 0 for external PM events.
+the PM_EVENT_AUTO bit in the message.event argument to the suspend
+method; this bit will be set for internal PM events (autosuspend) and
+clear for external PM events.
 
 Many of the ingredients in the autosuspend framework are oriented
 towards interfaces: The usb_interface structure contains the
 pm_usage_cnt field, and the usb_autopm_* routines take an interface
 pointer as their argument.  But somewhat confusingly, a few of the
-pieces (usb_mark_last_busy() and udev->auto_pm) use the usb_device
-structure instead.  Drivers need to keep this straight; they can call
+pieces (i.e., usb_mark_last_busy()) use the usb_device structure
+instead.  Drivers need to keep this straight; they can call
 interface_to_usbdev() to find the device structure for a given
 interface.
 
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 44bc8bb..4d29059 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1066,7 +1066,7 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 		return 0;
 
 	spin_lock_irq(&data->txlock);
-	if (!(interface_to_usbdev(intf)->auto_pm && data->tx_in_flight)) {
+	if (!((message.event & PM_EVENT_AUTO) && data->tx_in_flight)) {
 		set_bit(BTUSB_SUSPENDING, &data->flags);
 		spin_unlock_irq(&data->txlock);
 	} else {
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 0258289..e2997a8 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1253,10 +1253,9 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct hid_device *hid = usb_get_intfdata(intf);
 	struct usbhid_device *usbhid = hid->driver_data;
-	struct usb_device *udev = interface_to_usbdev(intf);
 	int status;
 
-	if (udev->auto_pm) {
+	if (message.event & PM_EVENT_AUTO) {
 		spin_lock_irq(&usbhid->lock);	/* Sync with error handler */
 		if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
 		    && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
@@ -1281,7 +1280,7 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
 			return -EIO;
 	}
 
-	if (!ignoreled && udev->auto_pm) {
+	if (!ignoreled && (message.event & PM_EVENT_AUTO)) {
 		spin_lock_irq(&usbhid->lock);
 		if (test_bit(HID_LED_ON, &usbhid->iofl)) {
 			spin_unlock_irq(&usbhid->lock);
@@ -1294,7 +1293,8 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
 	hid_cancel_delayed_stuff(usbhid);
 	hid_cease_io(usbhid);
 
-	if (udev->auto_pm && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
+	if ((message.event & PM_EVENT_AUTO) &&
+			test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
 		/* lost race against keypresses */
 		status = hid_start_in(hid);
 		if (status < 0)
diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index 47e84ef..3b48681 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -579,7 +579,7 @@ void i2400mu_disconnect(struct usb_interface *iface)
  *
  *    As well, the device might refuse going to sleep for whichever
  *    reason. In this case we just fail. For system suspend/hibernate,
- *    we *can't* fail. We look at usb_dev->auto_pm to see if the
+ *    we *can't* fail. We check PM_EVENT_AUTO to see if the
  *    suspend call comes from the USB stack or from the system and act
  *    in consequence.
  *
@@ -591,14 +591,11 @@ int i2400mu_suspend(struct usb_interface *iface, pm_message_t pm_msg)
 	int result = 0;
 	struct device *dev = &iface->dev;
 	struct i2400mu *i2400mu = usb_get_intfdata(iface);
-#ifdef CONFIG_PM
-	struct usb_device *usb_dev = i2400mu->usb_dev;
-#endif
 	unsigned is_autosuspend = 0;
 	struct i2400m *i2400m = &i2400mu->i2400m;
 
 #ifdef CONFIG_PM
-	if (usb_dev->auto_pm > 0)
+	if (pm_msg.event & PM_EVENT_AUTO)
 		is_autosuspend = 1;
 #endif
 
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 4f86447..8016a29 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1341,7 +1341,6 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
 	int	status = 0;
 
 	usb_pm_lock(udev);
-	udev->auto_pm = 1;
 	udev->pm_usage_cnt += inc_usage_cnt;
 	WARN_ON(udev->pm_usage_cnt < 0);
 	if (inc_usage_cnt)
@@ -1473,7 +1472,6 @@ static int usb_autopm_do_interface(struct usb_interface *intf,
 	if (intf->condition == USB_INTERFACE_UNBOUND)
 		status = -ENODEV;
 	else {
-		udev->auto_pm = 1;
 		atomic_add(inc_usage_cnt, &intf->pm_usage_cnt);
 		udev->last_busy = jiffies;
 		if (inc_usage_cnt >= 0 &&
@@ -1707,7 +1705,6 @@ int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg)
 
 	do_unbind_rebind(udev, DO_UNBIND);
 	usb_pm_lock(udev);
-	udev->auto_pm = 0;
 	status = usb_suspend_both(udev, msg);
 	usb_pm_unlock(udev);
 	return status;
@@ -1730,7 +1727,6 @@ int usb_external_resume_device(struct usb_device *udev, pm_message_t msg)
 	int	status;
 
 	usb_pm_lock(udev);
-	udev->auto_pm = 0;
 	status = usb_resume_both(udev, msg);
 	udev->last_busy = jiffies;
 	usb_pm_unlock(udev);
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 0d46bbe..8751ec7 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -1313,7 +1313,7 @@ static int option_suspend(struct usb_serial *serial, pm_message_t message)
 
 	dbg("%s entered", __func__);
 
-	if (serial->dev->auto_pm) {
+	if (message.event & PM_EVENT_AUTO) {
 		spin_lock_irq(&intfdata->susp_lock);
 		b = intfdata->in_flight;
 		spin_unlock_irq(&intfdata->susp_lock);
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index c5c41ae..ac1b644 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -1005,7 +1005,7 @@ static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
 	struct sierra_intf_private *intfdata;
 	int b;
 
-	if (serial->dev->auto_pm) {
+	if (message.event & PM_EVENT_AUTO) {
 		intfdata = serial->private;
 		spin_lock_irq(&intfdata->susp_lock);
 		b = intfdata->in_flight;
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 6e91ee4..4b6f6db 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -429,7 +429,6 @@ struct usb_tt;
  * @last_busy: time of last use
  * @autosuspend_delay: in jiffies
  * @connect_time: time device was first connected
- * @auto_pm: autosuspend/resume in progress
  * @do_remote_wakeup:  remote wakeup should be enabled
  * @reset_resume: needs reset instead of resume
  * @autosuspend_disabled: autosuspend disabled by the user
@@ -514,7 +513,6 @@ struct usb_device {
 	int autosuspend_delay;
 	unsigned long connect_time;
 
-	unsigned auto_pm:1;
 	unsigned do_remote_wakeup:1;
 	unsigned reset_resume:1;
 	unsigned autosuspend_disabled:1;