linux-kernel - Re: [PATCH] hw_random: atmel-rng: fix race condition leading to repeated bits

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Message-ID: <20120531105453.GA6266@gondor.apana.org.au>
Date:	Thu, 31 May 2012 20:54:53 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Peter Korsgaard <jacmet@...site.dk>
Cc:	nicolas.ferre@...el.com, jamie@...ieiles.com,
	linux-kernel@...r.kernel.org, GPontis@...com,
	stable@...r.kernel.org
Subject: Re: [PATCH] hw_random: atmel-rng: fix race condition leading to
 repeated bits

On Fri, May 25, 2012 at 11:12:38AM +0200, Peter Korsgaard wrote:
> Data valid gets cleared by reading the ISR (status register) and NOT from
> reading ODATA (data register). A new data word can become available between
> checking ISR and reading ODATA, causing us to reuse the same data word next
> time atmel_trng_read() gets called, if that happens before the following
> data word is ready.

Patch applied crypto.  Thanks!
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
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