Re: rtc: wm831x: Feed the write counter into device_add_randomness()

From: Theodore Ts'o
Date: Fri Jul 06 2012 - 17:23:16 EST

On Thu, Jul 05, 2012 at 08:19:17PM -0000, Mark Brown wrote:
> The tamper evident features of the RTC include the "write counter" which
> is a pseudo-random number regenerated whenever we set the RTC. Since this
> value is unpredictable it should provide some useful seeding to the random
> number generator.
> Only do this on boot since the goal is to seed the pool rather than add
> useful entropy.
> Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

> add_device_randomness() has only just been added in -next, this will
> need to either wait until after the merge window or be merged along with
> the patch adding it.

Thanks, I've added this to the /dev/random git tree.

- Ted

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