4 files changed, 69 insertions, 19 deletions

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 6ac3ca4c723c..b3d4ccc33a47 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1544,21 +1544,18 @@ static unsigned int normal_poll(struct tty_struct * tty, struct file * file, pol
 }
 
 struct tty_ldisc tty_ldisc_N_TTY = {
-        TTY_LDISC_MAGIC,        /* magic */
-        "n_tty",                /* name */
-        0,                      /* num */
-        0,                      /* flags */
-        n_tty_open,             /* open */
-        n_tty_close,            /* close */
-        n_tty_flush_buffer,     /* flush_buffer */
-        n_tty_chars_in_buffer,  /* chars_in_buffer */
-        read_chan,              /* read */
-        write_chan,             /* write */
-        n_tty_ioctl,            /* ioctl */
-        n_tty_set_termios,      /* set_termios */
-        normal_poll,            /* poll */
-        NULL,                   /* hangup */
-        n_tty_receive_buf,      /* receive_buf */
-        n_tty_write_wakeup      /* write_wakeup */
+        .magic           = TTY_LDISC_MAGIC,
+        .name            = "n_tty",
+        .open            = n_tty_open,
+        .close           = n_tty_close,
+        .flush_buffer    = n_tty_flush_buffer,
+        .chars_in_buffer = n_tty_chars_in_buffer,
+        .read            = read_chan,
+        .write           = write_chan,
+        .ioctl           = n_tty_ioctl,
+        .set_termios     = n_tty_set_termios,
+        .poll            = normal_poll,
+        .receive_buf     = n_tty_receive_buf,
+        .write_wakeup    = n_tty_write_wakeup
 };
 
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index fc662e4ce58a..fe62c2170d01 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -151,6 +151,12 @@ static int tty_open(struct inode *, struct file *);
 static int tty_release(struct inode *, struct file *);
 int tty_ioctl(struct inode * inode, struct file * file,
               unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file * file, unsigned int cmd,
+                                unsigned long arg);
+#else
+#define tty_compat_ioctl NULL
+#endif
 static int tty_fasync(int fd, struct file * filp, int on);
 static void release_tty(struct tty_struct *tty, int idx);
 static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
@@ -1143,8 +1149,8 @@ static unsigned int hung_up_tty_poll(struct file * filp, poll_table * wait)
         return POLLIN | POLLOUT | POLLERR | POLLHUP | POLLRDNORM | POLLWRNORM;
 }
 
-static int hung_up_tty_ioctl(struct inode * inode, struct file * file,
-                             unsigned int cmd, unsigned long arg)
+static long hung_up_tty_ioctl(struct file * file,
+                              unsigned int cmd, unsigned long arg)
 {
         return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
 }
@@ -1155,6 +1161,7 @@ static const struct file_operations tty_fops = {
         .write          = tty_write,
         .poll           = tty_poll,
         .ioctl          = tty_ioctl,
+        .compat_ioctl   = tty_compat_ioctl,
         .open           = tty_open,
         .release        = tty_release,
         .fasync         = tty_fasync,
@@ -1167,6 +1174,7 @@ static const struct file_operations ptmx_fops = {
         .write          = tty_write,
         .poll           = tty_poll,
         .ioctl          = tty_ioctl,
+        .compat_ioctl   = tty_compat_ioctl,
         .open           = ptmx_open,
         .release        = tty_release,
         .fasync         = tty_fasync,
@@ -1179,6 +1187,7 @@ static const struct file_operations console_fops = {
         .write          = redirected_tty_write,
         .poll           = tty_poll,
         .ioctl          = tty_ioctl,
+        .compat_ioctl   = tty_compat_ioctl,
         .open           = tty_open,
         .release        = tty_release,
         .fasync         = tty_fasync,
@@ -1189,7 +1198,8 @@ static const struct file_operations hung_up_tty_fops = {
         .read           = hung_up_tty_read,
         .write          = hung_up_tty_write,
         .poll           = hung_up_tty_poll,
-        .ioctl          = hung_up_tty_ioctl,
+        .unlocked_ioctl = hung_up_tty_ioctl,
+        .compat_ioctl   = hung_up_tty_ioctl,
         .release        = tty_release,
 };
 
@@ -3357,6 +3367,32 @@ int tty_ioctl(struct inode * inode, struct file * file,
         return retval;
 }
 
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file * file, unsigned int cmd,
+                                unsigned long arg)
+{
+        struct inode *inode = file->f_dentry->d_inode;
+        struct tty_struct *tty = file->private_data;
+        struct tty_ldisc *ld;
+        int retval = -ENOIOCTLCMD;
+
+        if (tty_paranoia_check(tty, inode, "tty_ioctl"))
+                return -EINVAL;
+
+        if (tty->driver->compat_ioctl) {
+                retval = (tty->driver->compat_ioctl)(tty, file, cmd, arg);
+                if (retval != -ENOIOCTLCMD)
+                        return retval;
+        }
+
+        ld = tty_ldisc_ref_wait(tty);
+        if (ld->compat_ioctl)
+                retval = ld->compat_ioctl(tty, file, cmd, arg);
+        tty_ldisc_deref(ld);
+
+        return retval;
+}
+#endif
 
 /*
  * This implements the "Secure Attention Key" ---  the idea is to
@@ -3689,6 +3725,7 @@ void tty_set_operations(struct tty_driver *driver,
         driver->write_room = op->write_room;
         driver->chars_in_buffer = op->chars_in_buffer;
         driver->ioctl = op->ioctl;
+        driver->compat_ioctl = op->compat_ioctl;
         driver->set_termios = op->set_termios;
         driver->throttle = op->throttle;
         driver->unthrottle = op->unthrottle;
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 659487e3ebeb..85c95cd39bc3 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -52,6 +52,11 @@
  *      This routine allows the tty driver to implement
  *      device-specific ioctl's.  If the ioctl number passed in cmd
  *      is not recognized by the driver, it should return ENOIOCTLCMD.
+ *
+ * long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+ *                      unsigned int cmd, unsigned long arg);
+ *
+ *      implement ioctl processing for 32 bit process on 64 bit system
  * 
  * void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
  *
@@ -132,6 +137,8 @@ struct tty_operations {
         int  (*chars_in_buffer)(struct tty_struct *tty);
         int  (*ioctl)(struct tty_struct *tty, struct file * file,
                     unsigned int cmd, unsigned long arg);
+        long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+                             unsigned int cmd, unsigned long arg);
         void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
         void (*throttle)(struct tty_struct * tty);
         void (*unthrottle)(struct tty_struct * tty);
@@ -193,6 +200,8 @@ struct tty_driver {
         int  (*chars_in_buffer)(struct tty_struct *tty);
         int  (*ioctl)(struct tty_struct *tty, struct file * file,
                     unsigned int cmd, unsigned long arg);
+        long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+                             unsigned int cmd, unsigned long arg);
         void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
         void (*throttle)(struct tty_struct * tty);
         void (*unthrottle)(struct tty_struct * tty);
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index d75932e27710..6226504d9108 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -59,6 +59,11 @@
  *      low-level driver can "grab" an ioctl request before the line
  *      discpline has a chance to see it.
  * 
+ * long (*compat_ioctl)(struct tty_struct * tty, struct file * file,
+ *                      unsigned int cmd, unsigned long arg);
+ *
+ *      Process ioctl calls from 32-bit process on 64-bit system
+ *
  * void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
  *
  *      This function notifies the line discpline that a change has
@@ -118,6 +123,8 @@ struct tty_ldisc {
                          const unsigned char * buf, size_t nr); 
         int     (*ioctl)(struct tty_struct * tty, struct file * file,
                          unsigned int cmd, unsigned long arg);
+        long    (*compat_ioctl)(struct tty_struct * tty, struct file * file,
+                                unsigned int cmd, unsigned long arg);
         void    (*set_termios)(struct tty_struct *tty, struct ktermios * old);
         unsigned int (*poll)(struct tty_struct *, struct file *,
                              struct poll_table_struct *);