USB-BKL: Convert usb_driver ioctl to unlocked_ioctl

And audit all the users. None needed the BKL.  That was easy
because there was only very few around.

Tested with allmodconfig build on x86-64
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
From: Andi Kleen <ak@linux.intel.com>

drivers/usb/core/devio.c

@@ -1668,13 +1668,10 @@ static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
 	default:
 		if (intf->dev.driver)
 			driver = to_usb_driver(intf->dev.driver);
-		if (driver == NULL || driver->ioctl == NULL) {
+		if (driver == NULL || driver->unlocked_ioctl == NULL) {
 			retval = -ENOTTY;
 		} else {
-			/* keep API that guarantees BKL */
-			lock_kernel();
-			retval = driver->ioctl(intf, ctl->ioctl_code, buf);
-			unlock_kernel();
+			retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
 			if (retval == -ENOIOCTLCMD)
 				retval = -ENOTTY;
 		}

drivers/usb/core/hub.c

@@ -1294,6 +1294,7 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	return -ENODEV;
 }
 
+/* No BKL needed */
 static int
 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
 {
@@ -3465,7 +3466,7 @@ static struct usb_driver hub_driver = {
 	.reset_resume =	hub_reset_resume,
 	.pre_reset =	hub_pre_reset,
 	.post_reset =	hub_post_reset,
-	.ioctl =	hub_ioctl,
+	.unlocked_ioctl = hub_ioctl,
 	.id_table =	hub_id_table,
 	.supports_autosuspend =	1,
 };

drivers/usb/misc/usbtest.c

@@ -1548,6 +1548,7 @@ test_iso_queue (struct usbtest_dev *dev, struct usbtest_param *param,
  * off just killing the userspace task and waiting for it to exit.
  */
 
+/* No BKL needed */
 static int
 usbtest_ioctl (struct usb_interface *intf, unsigned int code, void *buf)
 {
@@ -2170,7 +2171,7 @@ static struct usb_driver usbtest_driver = {
 	.name =		"usbtest",
 	.id_table =	id_table,
 	.probe =	usbtest_probe,
-	.ioctl =	usbtest_ioctl,
+	.unlocked_ioctl = usbtest_ioctl,
 	.disconnect =	usbtest_disconnect,
 	.suspend =	usbtest_suspend,
 	.resume =	usbtest_resume,

include/linux/usb.h

@@ -843,7 +843,7 @@ struct usb_driver {
 
 	void (*disconnect) (struct usb_interface *intf);
 
-	int (*ioctl) (struct usb_interface *intf, unsigned int code,
+	int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code,
 			void *buf);
 
 	int (*suspend) (struct usb_interface *intf, pm_message_t message);