From 109b6236294b53d8eaa50be7d9e9ad37079f5f7e Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@samba.org>
Date: Mon, 29 Jul 2013 13:11:50 +1000
Subject: of: Feed entire flattened device tree into the random pool

We feed the entire DMI table into the random pool to provide
better random data during early boot, so do the same with the
flattened device tree.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
---
 drivers/of/fdt.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'drivers/of')

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 4c5ee96bf487..543c5002831e 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -18,6 +18,7 @@
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <linux/random.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #ifdef CONFIG_PPC
@@ -726,3 +727,14 @@ void __init unflatten_device_tree(void)
 }
 
 #endif /* CONFIG_OF_EARLY_FLATTREE */
+
+/* Feed entire flattened device tree into the random pool */
+static int __init add_fdt_randomness(void)
+{
+	if (initial_boot_params)
+		add_device_randomness(initial_boot_params,
+				be32_to_cpu(initial_boot_params->totalsize));
+
+	return 0;
+}
+core_initcall(add_fdt_randomness);
-- 
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