--- drivers/ide/ide.c~	Sun Apr 16 14:35:17 2000
+++ drivers/ide/ide.c	Sun Apr 16 14:35:56 2000
@@ -1775,7 +1775,8 @@
 		drive->part[p].nr_sects   = 0;
 	};
 
-	DRIVER(drive)->revalidate(drive);
+	if (DRIVER(drive)->revalidate)
+		DRIVER(drive)->revalidate(drive);
 
 	drive->busy = 0;
 	wake_up(&drive->wqueue);