diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 7930fba..63d22b5 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -609,7 +609,7 @@
 static void	stli_stop(struct tty_struct *tty);
 static void	stli_start(struct tty_struct *tty);
 static void	stli_flushbuffer(struct tty_struct *tty);
-static void	stli_breakctl(struct tty_struct *tty, int state);
+static int	stli_breakctl(struct tty_struct *tty, int state);
 static void	stli_waituntilsent(struct tty_struct *tty, int timeout);
 static void	stli_sendxchar(struct tty_struct *tty, char ch);
 static void	stli_hangup(struct tty_struct *tty);
@@ -1909,7 +1909,7 @@
 
 /*****************************************************************************/
 
-static void stli_breakctl(struct tty_struct *tty, int state)
+static int stli_breakctl(struct tty_struct *tty, int state)
 {
 	struct stlibrd	*brdp;
 	struct stliport	*portp;
@@ -1917,15 +1917,16 @@
 
 	portp = tty->driver_data;
 	if (portp == NULL)
-		return;
+		return -EINVAL;
 	if (portp->brdnr >= stli_nrbrds)
-		return;
+		return -EINVAL;
 	brdp = stli_brds[portp->brdnr];
 	if (brdp == NULL)
-		return;
+		return -EINVAL;
 
 	arg = (state == -1) ? BREAKON : BREAKOFF;
 	stli_cmdwait(brdp, portp, A_BREAK, &arg, sizeof(long), 0);
+	return 0;
 }
 
 /*****************************************************************************/