--- linux-2.6.11.orig/drivers/char/amiserial.c	2005-05-17 10:55:03.000000000 +0200
+++ linux-2.6.11/drivers/char/amiserial.c	2005-05-24 17:10:16.000000000 +0200
@@ -861,13 +861,18 @@
 
 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
 {
-	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	struct async_struct *info;
 	unsigned long flags;
 
+	if(!tty)
+		return;
+	
+	info = (struct async_struct *)tty->driver_data;
+	
 	if (serial_paranoia_check(info, tty->name, "rs_put_char"))
 		return;
 
-	if (!tty || !info->xmit.buf)
+	if (!info->xmit.buf)
 		return;
 
 	local_irq_save(flags);
@@ -910,13 +915,18 @@
 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 {
 	int	c, ret = 0;
-	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	struct async_struct *info;
 	unsigned long flags;
 
+	if(!tty)
+		return 0;
+
+	info = (struct async_struct *)tty->driver_data;
+	
 	if (serial_paranoia_check(info, tty->name, "rs_write"))
 		return 0;
 
-	if (!tty || !info->xmit.buf || !tmp_buf)
+	if (!info->xmit.buf || !tmp_buf)
 		return 0;
 
 	local_save_flags(flags);