#include <linux/isdn.h>
#include <linux/delay.h>
+#include <linux/smp_lock.h>
#include "isdn_common.h"
#include "isdn_tty.h"
#ifdef CONFIG_ISDN_AUDIO
int retval, line;
line = tty->index;
- if (line < 0 || line > ISDN_MAX_CHANNELS)
+ if (line < 0 || line >= ISDN_MAX_CHANNELS)
return -ENODEV;
info = &dev->mdm.info[line];
if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_open"))