Re: [PATCH v6 1/5] random: Blocking API for accessing nonblocking_pool

Herbert Xu
2015-05-19T22:55:47Z

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@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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