USB: use PM core routines to enable/disable autosuspend

This patch (as1366) replaces the private routines
usb_enable_autosuspend() and usb_disable_autosuspend() with calls to
the standard pm_runtime_allow() and pm_runtime_forbid() functions in
the runtime PM framework.  They do the same thing.

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

2 files changed, 10 insertions, 21 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 271e857be0f..207146743ea 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1356,13 +1356,9 @@ int usb_resume(struct device *dev, pm_message_t msg)
  *
  * The caller must hold @udev's device lock.
  */
-int usb_enable_autosuspend(struct usb_device *udev)
+void usb_enable_autosuspend(struct usb_device *udev)
 {
-	if (udev->autosuspend_disabled) {
-		udev->autosuspend_disabled = 0;
-		usb_autosuspend_device(udev);
-	}
-	return 0;
+	pm_runtime_allow(&udev->dev);
 }
 EXPORT_SYMBOL_GPL(usb_enable_autosuspend);
 
@@ -1375,16 +1371,9 @@ EXPORT_SYMBOL_GPL(usb_enable_autosuspend);
  *
  * The caller must hold @udev's device lock.
  */
-int usb_disable_autosuspend(struct usb_device *udev)
+void usb_disable_autosuspend(struct usb_device *udev)
 {
-	int rc = 0;
-
-	if (!udev->autosuspend_disabled) {
-		rc = usb_autoresume_device(udev);
-		if (rc == 0)
-			udev->autosuspend_disabled = 1;
-	}
-	return rc;
+	pm_runtime_forbid(&udev->dev);
 }
 EXPORT_SYMBOL_GPL(usb_disable_autosuspend);
 
@@ -1528,7 +1517,7 @@ void usb_autopm_put_interface_async(struct usb_interface *intf)
 	atomic_dec(&intf->pm_usage_cnt);
 	pm_runtime_put_noidle(&intf->dev);
 
-	if (!udev->autosuspend_disabled) {
+	if (udev->dev.power.runtime_auto) {
 		/* Optimization: Don't schedule a delayed autosuspend if
 		 * the timer is already running and the expiration time
 		 * wouldn't change.
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 43c002e3a9a..b65c1eaf3ab 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -389,7 +389,7 @@ show_level(struct device *dev, struct device_attribute *attr, char *buf)
 	struct usb_device *udev = to_usb_device(dev);
 	const char *p = auto_string;
 
-	if (udev->state != USB_STATE_SUSPENDED && udev->autosuspend_disabled)
+	if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
 		p = on_string;
 	return sprintf(buf, "%s\n", p);
 }
@@ -401,7 +401,7 @@ set_level(struct device *dev, struct device_attribute *attr,
 	struct usb_device *udev = to_usb_device(dev);
 	int len = count;
 	char *cp;
-	int rc;
+	int rc = count;
 
 	cp = memchr(buf, '\n', count);
 	if (cp)
@@ -411,17 +411,17 @@ set_level(struct device *dev, struct device_attribute *attr,
 
 	if (len == sizeof on_string - 1 &&
 			strncmp(buf, on_string, len) == 0)
-		rc = usb_disable_autosuspend(udev);
+		usb_disable_autosuspend(udev);
 
 	else if (len == sizeof auto_string - 1 &&
 			strncmp(buf, auto_string, len) == 0)
-		rc = usb_enable_autosuspend(udev);
+		usb_enable_autosuspend(udev);
 
 	else
 		rc = -EINVAL;
 
 	usb_unlock_device(udev);
-	return (rc < 0 ? rc : count);
+	return rc;
 }
 
 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);