---

yaml
---
r: 185321
b: refs/heads/master
c: 5899f1e
h: refs/heads/master
i:
  185319: 86e7b0d
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 088f7fec8a0e683db72fd8826c5d3ab914e197b1
+refs/heads/master: 5899f1e020c8d53b2b6fbd6a6cf39c891ccdfade

trunk/drivers/usb/core/quirks.c

@@ -103,11 +103,21 @@ void usb_detect_quirks(struct usb_device *udev)
 		dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
 				udev->quirks);
 
+#ifdef	CONFIG_USB_SUSPEND
+
 	/* By default, disable autosuspend for all devices.  The hub driver
 	 * will enable it for hubs.
 	 */
 	usb_disable_autosuspend(udev);
 
+	/* Autosuspend can also be disabled if the initial autosuspend_delay
+	 * is negative.
+	 */
+	if (udev->autosuspend_delay < 0)
+		usb_autoresume_device(udev);
+
+#endif
+
 	/* For the present, all devices default to USB-PERSIST enabled */
 #if 0		/* was: #ifdef CONFIG_PM */
 	/* Hubs are automatically enabled for USB-PERSIST */

trunk/drivers/usb/core/sysfs.c

@@ -346,21 +346,33 @@ set_autosuspend(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {
 	struct usb_device *udev = to_usb_device(dev);
-	int value;
+	int value, old_delay;
+	int rc;
 
 	if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
 			value <= - INT_MAX/HZ)
 		return -EINVAL;
 	value *= HZ;
 
 	usb_lock_device(udev);
+	old_delay = udev->autosuspend_delay;
 	udev->autosuspend_delay = value;
-	if (value >= 0)
-		usb_try_autosuspend_device(udev);
-	else {
-		if (usb_autoresume_device(udev) == 0)
+
+	if (old_delay < 0) {	/* Autosuspend wasn't allowed */
+		if (value >= 0)
 			usb_autosuspend_device(udev);
+	} else {		/* Autosuspend was allowed */
+		if (value < 0) {
+			rc = usb_autoresume_device(udev);
+			if (rc < 0) {
+				count = rc;
+				udev->autosuspend_delay = old_delay;
+			}
+		} else {
+			usb_try_autosuspend_device(udev);
+		}
 	}
+
 	usb_unlock_device(udev);
 	return count;
 }