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>

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 4c5ee96bf48719a1d29d8fd4b8b36fef636b0efa..543c5002831ec8a433e8ebf348487ae69cfedc93 100644 (file)
--- 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);