[patch]kill BKL in skeleton driver

Hi,

Iet's kill BKL where we can. This is relative to the last patch to the
skeleton driver.

	Regards
		Oliver

Signed-off-by: Oliver Neukum <[email protected]>
-----

--- a/drivers/usb/usb-skeleton.c	2007-03-01 22:57:09.000000000 +0100
+++ b/drivers/usb/usb-skeleton.c	2007-03-01 23:02:33.000000000 +0100
@@ -34,6 +34,9 @@
 };
 MODULE_DEVICE_TABLE(usb, skel_table);
 
+/* to prevent a race between open and disconnect */
+static DEFINE_MUTEX(skel_open_lock);
+
 
 /* Get a minor range for your devices from the usb maintainer */
 #define USB_SKEL_MINOR_BASE	192
@@ -80,8 +83,10 @@
 
 	subminor = iminor(inode);
 
+	mutex_lock(&skel_open_lock);
 	interface = usb_find_interface(&skel_driver, subminor);
 	if (!interface) {
+		mutex_unlock(&skel_open_lock);
 		err ("%s - error, can't find device for minor %d",
 		     __FUNCTION__, subminor);
 		retval = -ENODEV;
@@ -90,12 +95,15 @@
 
 	dev = usb_get_intfdata(interface);
 	if (!dev) {
+		mutex_unlock(&skel_open_lock);
 		retval = -ENODEV;
 		goto exit;
 	}
 
 	/* increment our usage count for the device */
 	kref_get(&dev->kref);
+	/* now we can drop the lock */
+	mutex_unlock(&skel_open_lock);
 
 	/* prevent the device from being autosuspended */
 	retval = usb_autopm_get_interface(interface);
@@ -361,14 +369,14 @@
 	int minor = interface->minor;
 
 	/* prevent skel_open() from racing skel_disconnect() */
-	lock_kernel();
+	mutex_lock(&skel_open_lock);
 
 	dev = usb_get_intfdata(interface);
 	usb_set_intfdata(interface, NULL);
 
 	/* give back our minor */
 	usb_deregister_dev(interface, &skel_class);
-	unlock_kernel();
+	mutex_unlock(&skel_open_lock);
 
 	/* prevent more I/O from starting */
 	mutex_lock(&dev->io_mutex);


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