[PATCH] of: Feed entire flattened device tree into the random pool
From: Anton Blanchard <hidden>
Date: 2013-07-25 04:30:45
Also in:
linux-devicetree
Hi Michael,
But why not put the initcall in drivers/of/fdt.c, that way it's not early but it's still common ?
Good idea! How does this look? So long as it happens before module_init(rand_initialize) we should be good. Anton -- 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 <redacted> --- v2: move to drivers/of/fdt.c as suggested by Michael Ellerman Index: b/drivers/of/fdt.c ===================================================================
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c@@ -17,6 +17,7 @@ #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
@@ -714,3 +715,14 @@ 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, + initial_boot_params->totalsize); + + return 0; +} +core_initcall(add_fdt_randomness);