linux-kernel - Re: rtc: wm831x: Feed the write counter into device_add

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Message-ID: <20120706212304.GA4841@thunk.org>
Date:	Fri, 6 Jul 2012 17:23:04 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	rtc-linux@...glegroups.com
Subject: Re: rtc: wm831x: Feed the write counter into device_add_randomness()

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@...nsource.wolfsonmicro.com>

> 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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