[PATCH] ide: unregister idepnp driver on unload

idepnp driver is registered as a pnp driver on ide init but doesn't
get unregistered on ide unload causing driver list corruption and
eventually oops.  Fix it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

---
 drivers/ide/ide-pnp.c |    5 +++++
 drivers/ide/ide.c     |    5 +++++
 2 files changed, 10 insertions(+)

Index: b/drivers/ide/ide-pnp.c
===================================================================
--- a/drivers/ide/ide-pnp.c
+++ b/drivers/ide/ide-pnp.c
@@ -73,3 +73,8 @@ void __init pnpide_init(void)
 {
 	pnp_register_driver(&idepnp_driver);
 }
+
+void __exit pnpide_exit(void)
+{
+	pnp_unregister_driver(&idepnp_driver);
+}
Index: b/drivers/ide/ide.c
===================================================================
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -1815,6 +1815,7 @@ done:
 }
 
 extern void pnpide_init(void);
+extern void pnpide_exit(void);
 extern void h8300_ide_init(void);
 
 /*
@@ -2127,6 +2128,10 @@ void cleanup_module (void)
 	for (index = 0; index < MAX_HWIFS; ++index)
 		ide_unregister(index);
 
+#ifdef CONFIG_BLK_DEV_IDEPNP
+	pnpide_exit();
+#endif
+
 #ifdef CONFIG_PROC_FS
 	proc_ide_destroy();
 #endif