ARM64: dts: rk3399: support more frequency for evb2

[firefly-linux-kernel-4.4.55.git] / drivers / tty / pty.c

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index a45660f62db54e37c47e0a04f5101d4adfb3463f..78e983677339163a170adc0ec1e1eb2a82f69d23 100644 (file)
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -681,7 +681,14 @@ static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
 /* this is called once with whichever end is closed last */
 static void pty_unix98_shutdown(struct tty_struct *tty)
 {
-       devpts_kill_index(tty->driver_data, tty->index);
+       struct inode *ptmx_inode;
+
+       if (tty->driver->subtype == PTY_TYPE_MASTER)
+               ptmx_inode = tty->driver_data;
+       else
+               ptmx_inode = tty->link->driver_data;
+       devpts_kill_index(ptmx_inode, tty->index);
+       devpts_del_ref(ptmx_inode);
 }
 
 static const struct tty_operations ptm_unix98_ops = {
@@ -773,6 +780,18 @@ static int ptmx_open(struct inode *inode, struct file *filp)
        set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
        tty->driver_data = inode;
 
+       /*
+        * In the case where all references to ptmx inode are dropped and we
+        * still have /dev/tty opened pointing to the master/slave pair (ptmx
+        * is closed/released before /dev/tty), we must make sure that the inode
+        * is still valid when we call the final pty_unix98_shutdown, thus we
+        * hold an additional reference to the ptmx inode. For the same /dev/tty
+        * last close case, we also need to make sure the super_block isn't
+        * destroyed (devpts instance unmounted), before /dev/tty is closed and
+        * on its release devpts_kill_index is called.
+        */
+       devpts_add_ref(inode);
+
        tty_add_file(tty, filp);
 
        slave_inode = devpts_pty_new(inode,