X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Ftty%2Fpty.c;fp=drivers%2Ftty%2Fpty.c;h=e16a49b507efbd57734b0b8f522d0e2a5dfe03ce;hb=2292705bd6c27b3ed2f83db8d2268d8006c027d7;hp=78170e7aa3a31acd8c2bb1592bb2064775215b8b;hpb=54573c4a073ff510d028f423ed3074573c7d9437;p=karo-tx-linux.git

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 78170e7aa3a3..e16a49b507ef 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -663,7 +663,14 @@ static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
 /* this is called once with whichever end is closed last */
 static void pty_unix98_remove(struct tty_driver *driver, 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 = {
@@ -753,6 +760,18 @@ 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,