Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/sbus/char/flash.c b/drivers/sbus/char/flash.c
index a610b8d..e85a05a 100644
--- a/drivers/sbus/char/flash.c
+++ b/drivers/sbus/char/flash.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* flash.c: Allow mmap access to the OBP Flash, for OBP updates.
  *
  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
@@ -165,9 +166,9 @@
 
 	parent = dp->parent;
 
-	if (strcmp(parent->name, "sbus") &&
-	    strcmp(parent->name, "sbi") &&
-	    strcmp(parent->name, "ebus"))
+	if (!of_node_name_eq(parent, "sbus") &&
+	    !of_node_name_eq(parent, "sbi") &&
+	    !of_node_name_eq(parent, "ebus"))
 		return -ENODEV;
 
 	flash.read_base = op->resource[0].start;