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

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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>
This commit is contained in:
Linus Walleij 2015-06-18 16:46:34 +02:00
parent b8824c9a54
commit e8a7d2bb93
1 changed files with 7 additions and 0 deletions
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7
arch/arm/mach-ep93xx/core.c
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@ -37,6 +37,7 @@
#include <linux/irqchip/arm-vic.h> #include <linux/irqchip/arm-vic.h>
#include <linux/reboot.h> #include <linux/reboot.h>
#include <linux/usb/ohci_pdriver.h> #include <linux/usb/ohci_pdriver.h>
#include <linux/random.h>
#include <mach/hardware.h> #include <mach/hardware.h>
#include <linux/platform_data/video-ep93xx.h> #include <linux/platform_data/video-ep93xx.h>
@ -862,6 +863,12 @@ static const char __init *ep93xx_get_soc_id(void)
if (id != id2) if (id != id2)
return "invalid"; 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), snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
"%08x%08x%08x%08x", id2, id3, id4, id5); "%08x%08x%08x%08x", id2, id3, id4, id5);