[PATCH] ARM: ep93xx: toss the device ID into the entropy pool

[Hartley Sweeten]

On Thursday, June 18, 2015 7:48 AM, Linus Walleij wrote:
> It doesn't hurt to add this random stuff into the entropy pool
> as is custom to do with device-unique numbers.
>
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> ---
>  arch/arm/mach-ep93xx/core.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
> index 5e2151bcc0c5..c393b1b0310d 100644
> --- 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);
 
Make sense.

Reviewed-by: H Hartley Sweeten <hsweeten at visionengravers.com>