2.4 IDE hotplug disk change and size change problem

[Alan Cox <alan@redhat.com>]

Some people found that the

	hdparm -b0 
	swap disk for a larger one
	hdparm -b1

would then go nuts with disks IFF the new disk was larger and fdisk wasnt run.

Can folks seeing this try the following guess at the problem (I dont currently
have any hotpluggable IDE working except CD/DVD bays)


--- ide.c~	2003-12-23 22:45:50.000000000 +0000
+++ ide.c	2003-12-23 22:51:26.000000000 +0000
@@ -826,7 +826,11 @@
 	for (unit = 0; unit < MAX_DRIVES; ++unit) {
 		ide_drive_t *drive = &hwif->drives[unit];
 		if(drive->present && !drive->dead)
+		{
+			drive->revalidate = 1;
 			ide_attach_drive(drive);
+			ide_revalidate_disk(MKDEV(hwif->major, unit<<PARTN_BITS));
+		}
 	}
 	our_drive->usage++;
 	return 0;