tty: add compat_ioctl

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / tty_io.c

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index fc662e4ce58aebd0f4995c2b880b417549b294fe..fe62c2170d01692fe3e05430aeba5374fc8c1742 100644 (file)
--- 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;