linux-kernel - Re: [PATCH v6 1/5] random: Blocking API for accessing nonblocking

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Message-ID: <20150519225533.GA5718@gondor.apana.org.au>
Date:	Wed, 20 May 2015 06:55:33 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephan Mueller <smueller@...onox.de>
Cc:	Theodore Ts'o <tytso@....edu>, pebolle@...cali.nl,
	andreas.steffen@...ongswan.org, sandyinchina@...il.com,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH v6 1/5] random: Blocking API for accessing
 nonblocking_pool

On Tue, May 19, 2015 at 04:36:58PM +0200, Stephan Mueller wrote:
> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index 9cd6968..6f71354 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -1245,6 +1245,20 @@ void get_random_bytes(void *buf, int nbytes)
>  EXPORT_SYMBOL(get_random_bytes);
>  
>  /*
> + * Equivalent function to get_random_bytes with the difference that this
> + * function blocks the request until the nonblocking_pool is initialized.
> + */
> +void get_blocking_random_bytes(void *buf, int nbytes)
> +{
> +       if (unlikely(nonblocking_pool.initialized == 0))
> +               wait_event_interruptible(urandom_init_wait,
> +                                        nonblocking_pool.initialized);
> +       extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0);
> +}
> +EXPORT_SYMBOL(get_blocking_random_bytes);

You still need to handle the case where wait_event_interruptible
returns an error.  Otherwise this looks fine.

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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