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

[Herbert Xu <herbert@gondor.apana.org.au>]

On Mon, May 18, 2015 at 07:32:01AM +0200, Stephan Mueller wrote:
> 
> Thanks for the hint to the list. Before handing in another formal patch, may i ask for checking the following approach? I would think that this one should cover your concerns.

Yes this is definitely going in the right direction.

> +/*
> + * Equivalent function to get_random_bytes with the difference that this
> + * function blocks the request until the nonblocking_pool is initialized.
> + */
> +int get_blocking_random_bytes_cb(void *buf, int nbytes, void *private,
> +				 void (*cb)(void *buf, int buflen,
> +					    void *private))

You can simplify this further and get rid of buf/nbytes.  All
we need to know is whether the pool is ready.  Everything else
can come from private.

> +	struct random_work *rw = NULL;
> +	int ret = 0;

I think this function should return 0 if the pool is ready now,
-EINPROGRESS if it's not (indicating that the callback will be
called when it is ready) and otherwise an error.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
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