ARM: ep93xx: toss the device ID into the entropy pool

It doesn't hurt to add this random stuff into the entropy pool
as is custom to do with device-unique numbers.

Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 5e2151bcc0c5be53c4b843aaacb209b13987b001..c393b1b0310df78e3cbbea8ef9d7336de7f82d19 100644 (file)
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -37,6 +37,7 @@
 #include <linux/irqchip/arm-vic.h>
 #include <linux/reboot.h>
 #include <linux/usb/ohci_pdriver.h>
+#include <linux/random.h>
 
 #include <mach/hardware.h>
 #include <linux/platform_data/video-ep93xx.h>
@@ -862,6 +863,12 @@ static const char __init *ep93xx_get_soc_id(void)
        if (id != id2)
                return "invalid";
 
+       /* Toss the unique ID into the entropy pool */
+       add_device_randomness(&id2, 4);
+       add_device_randomness(&id3, 4);
+       add_device_randomness(&id4, 4);
+       add_device_randomness(&id5, 4);
+
        snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
                 "%08x%08x%08x%08x", id2, id3, id4, id5);