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Date:	Mon, 10 Nov 2014 21:47:27 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Amos Kong <akong@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	rusty@...tcorp.com.au, m@...s.ch, mb@...sch.de, mpm@...enic.com,
	amit.shah@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/6] hw_random: fix unregister race.

On Mon, Nov 03, 2014 at 11:56:24PM +0800, Amos Kong wrote:
>
> @@ -98,6 +99,8 @@ static inline void cleanup_rng(struct kref *kref)
>  
>  	if (rng->cleanup)
>  		rng->cleanup(rng);

You need a compiler barrier here to prevent reordering.

> +	rng->cleanup_done = true;

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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