1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index 38385677c653..911822db614d 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -19,6 +19,7 @@
 
 #include <linux/slab.h>
 #include <linux/bootmem.h>
+#include <linux/compat.h>
 
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
@@ -1731,6 +1732,22 @@ tty3270_ioctl(struct tty_struct *tty, struct file *file,
         return kbd_ioctl(tp->kbd, file, cmd, arg);
 }
 
+#ifdef CONFIG_COMPAT
+static long
+tty3270_compat_ioctl(struct tty_struct *tty, struct file *file,
+              unsigned int cmd, unsigned long arg)
+{
+        struct tty3270 *tp;
+
+        tp = tty->driver_data;
+        if (!tp)
+                return -ENODEV;
+        if (tty->flags & (1 << TTY_IO_ERROR))
+                return -EIO;
+        return kbd_ioctl(tp->kbd, file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static const struct tty_operations tty3270_ops = {
         .open = tty3270_open,
         .close = tty3270_close,
@@ -1745,6 +1762,9 @@ static const struct tty_operations tty3270_ops = {
         .hangup = tty3270_hangup,
         .wait_until_sent = tty3270_wait_until_sent,
         .ioctl = tty3270_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = tty3270_compat_ioctl,
+#endif
         .set_termios = tty3270_set_termios
 };