From: Eugene Teo <redacted>

Add missing sanity check to tty operation.

Acked-by: Alan Cox <redacted>
Signed-off-by: Eugene Teo <redacted>
Cc: Jeff Garzik <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/net/hamradio/mkiss.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN drivers/net/hamradio/mkiss.c~hamradio-add-missing-sanity-check-to-tty-operation drivers/net/hamradio/mkiss.c

--- a/drivers/net/hamradio/mkiss.c~hamradio-add-missing-sanity-check-to-tty-operation
+++ a/drivers/net/hamradio/mkiss.c

@@ -548,7 +548,7 @@ static int ax_xmit(struct sk_buff *skb, 
 		}
 
 		printk(KERN_ERR "mkiss: %s: transmit timed out, %s?\n", dev->name,
-		       (ax->tty->ops->chars_in_buffer(ax->tty) || ax->xleft) ?
+		       (tty_chars_in_buffer(ax->tty) || ax->xleft) ?
 		       "bad line quality" : "driver error");
 
 		ax->xleft = 0;