Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index c538145..42e5a76 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* -*- linux-c -*- --------------------------------------------------------- *
  *
  * linux/fs/devpts/inode.c
  *
  *  Copyright 1998-2004 H. Peter Anvin -- All Rights Reserved
  *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- *
  * ------------------------------------------------------------------------- */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -455,6 +452,7 @@
 	s->s_blocksize_bits = 10;
 	s->s_magic = DEVPTS_SUPER_MAGIC;
 	s->s_op = &devpts_sops;
+	s->s_d_op = &simple_dentry_operations;
 	s->s_time_gran = 1;
 
 	error = -ENOMEM;
@@ -623,7 +621,8 @@
 
 	dentry->d_fsdata = NULL;
 	drop_nlink(dentry->d_inode);
-	d_delete(dentry);
+	fsnotify_unlink(d_inode(dentry->d_parent), dentry);
+	d_drop(dentry);
 	dput(dentry);	/* d_alloc_name() in devpts_pty_new() */
 }