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

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Date:	Tue, 19 May 2015 22:18:05 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Theodore Ts'o <tytso@....edu>,
	Stephan Mueller <smueller@...onox.de>, 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 09:50:28AM -0400, Theodore Ts'o wrote:
>
> Finally, this is only going to block *once*, when the system is
> initially botting up.  Why is it so important that we get the
> asynchronous nature of this right, and why can't we solve it simply by
> just simply doing the work in a workqueue, with a completion barrier
> getting triggered once /dev/random initializes itself, and just simply
> blocking the module unload until /dev/random is initialized?

I guess I'm still thinking of the old work queue code before
Tejun's cmwq work.  Yes blocking in a work queue should be fine
as there is usually just one DRBG instance.

Cheers,
-- 
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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