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 271e857be0fa..207146743ea7 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 43c002e3a9aa..b65c1eaf3aba 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);