[PATCH] uml ubd driver: allow using up to 16 UBD devices

With 256 minors and 16 minors used per each UBD device, we can allow the use
of up to 16 UBD devices per UML.

Also chnage parse_unit and leave to the caller (which already do it) the check
for excess numbers, since this is just supposed to do raw parsing.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/drivers/ubd_kern.c

@@ -117,7 +117,7 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
 		     unsigned int cmd, unsigned long arg);
 static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 
-#define MAX_DEV (8)
+#define MAX_DEV (16)
 
 static struct block_device_operations ubd_blops = {
         .owner		= THIS_MODULE,
@@ -277,7 +277,7 @@ static int parse_unit(char **ptr)
 			return(-1);
 		*ptr = end;
 	}
-	else if (('a' <= *str) && (*str <= 'h')) {
+	else if (('a' <= *str) && (*str <= 'z')) {
 		n = *str - 'a';
 		str++;
 		*ptr = str;