staging: dgap: introducing find_board_by_major()

index 3f23e5b..f38354f 100644
@@ -80,7 +80,6 @@ static int dgap_poll_tick = 20;	/* Poll interval - 20 ms */
 
 static struct class *dgap_class;
 
-static struct board_t *dgap_boards_by_major[256];
 static uint dgap_count = 500;
 
 /*

@@ -4409,6 +4408,22 @@ static void dgap_tty_unthrottle(struct tty_struct *tty)
 	spin_unlock_irqrestore(&bd->bd_lock, lock_flags);
 }
 
+static struct board_t *find_board_by_major(unsigned int major)
+{
+	unsigned int i;
+
+	for (i = 0; i < MAXBOARDS; i++) {
+		struct board_t *brd = dgap_board[i];
+		if (!brd)
+			return NULL;
+		if (major == brd->serial_driver->major ||
+		    major == brd->print_driver->major)
+			return brd;
+	}
+
+	return NULL;
+}
+
 /************************************************************************
  *
  * TTY Entry points and helper functions

@@ -4435,11 +4450,7 @@ static int dgap_tty_open(struct tty_struct *tty, struct file *file)
 	major = MAJOR(tty_devnum(tty));
 	minor = MINOR(tty_devnum(tty));
 
-	if (major > 255)
-		return -EIO;
-
-	/* Get board pointer from our array of majors we have allocated */
-	brd = dgap_boards_by_major[major];
+	brd = find_board_by_major(major);
 	if (!brd)
 		return -EIO;
 

@@ -5301,9 +5312,6 @@ static int dgap_tty_register(struct board_t *brd)
 	if (rc < 0)
 		goto unregister_serial_drv;
 
-	dgap_boards_by_major[brd->serial_driver->major] = brd;
-	dgap_boards_by_major[brd->print_driver->major] = brd;
-
 	return 0;
 
 unregister_serial_drv:

@@ -6559,7 +6567,6 @@ static void dgap_cleanup_tty(struct board_t *brd)
 	struct device *dev;
 	unsigned int i;
 
-	dgap_boards_by_major[brd->serial_driver->major] = NULL;
 	for (i = 0; i < brd->nasync; i++) {
 		tty_port_destroy(&brd->serial_ports[i]);
 		dev = brd->channels[i]->ch_tun.un_sysfs;

@@ -6570,7 +6577,6 @@ static void dgap_cleanup_tty(struct board_t *brd)
 	put_tty_driver(brd->serial_driver);
 	kfree(brd->serial_ports);
 
-	dgap_boards_by_major[brd->print_driver->major] = NULL;
 	for (i = 0; i < brd->nasync; i++) {
 		tty_port_destroy(&brd->printer_ports[i]);
 		dev = brd->channels[i]->ch_pun.un_sysfs;