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-rw-r--r--drivers/tty/pty.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 3b5cde833ee5..2348fa613707 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -688,7 +688,7 @@ static void pty_unix98_shutdown(struct tty_struct *tty)
else
ptmx_inode = tty->link->driver_data;
devpts_kill_index(ptmx_inode, tty->index);
- iput(ptmx_inode); /* drop reference we acquired at ptmx_open */
+ devpts_del_ref(ptmx_inode);
}
static const struct tty_operations ptm_unix98_ops = {
@@ -785,9 +785,12 @@ static int ptmx_open(struct inode *inode, struct file *filp)
* 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
+ * 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.
*/
- ihold(inode);
+ devpts_add_ref(inode);
tty_add_file(tty, filp);