From a6932c3f9ef3aa0c61fae4ff591f1f01783a45b4 Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Fri, 8 Jan 2021 14:05:06 +0200
Subject: thunderbolt: Use pseudo-random number as initial property block
 generation

As recommended by USB4 inter-domain service spec use pseudo-random value
instead of zero as initial XDomain property block generation value.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/thunderbolt/xdomain.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/thunderbolt')

diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index a1657663a95e..cfe6fa7e84f4 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -12,6 +12,7 @@
 #include <linux/kmod.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
+#include <linux/prandom.h>
 #include <linux/utsname.h>
 #include <linux/uuid.h>
 #include <linux/workqueue.h>
@@ -1880,6 +1881,7 @@ int tb_xdomain_init(void)
 	tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x1);
 	tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100);
 
+	xdomain_property_block_gen = prandom_u32();
 	return 0;
 }
 
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