linux-kernel - Re: [PATCH 2/3] crypto: Per-CPU cryptd thread implementation based on kcrypto

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Message-ID: <20090203092148.GA6402@gondor.apana.org.au>
Date:	Tue, 3 Feb 2009 20:21:48 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Huang Ying <ying.huang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH 2/3] crypto: Per-CPU cryptd thread implementation based
	on kcrypto_wq

On Tue, Feb 03, 2009 at 01:10:38AM -0800, Andrew Morton wrote:
>
> > +{
> > +	struct cryptd_cpu_queue *cpu_queue;
> > +	struct crypto_async_request *req, *backlog;
> > +
> > +	cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
> > +	/* Only handle one request at a time to avoid hogging crypto
> > +	 * workqueue */
> 
> Not sure what that means.

It looks like this was copied from chainiv which put the work
in eventd, which is obviously no longer the case here.

> > +	if (!req)
> > +		goto out;
> > +
> > +	if (backlog)
> > +		backlog->complete(backlog, -EINPROGRESS);
> > +	req->complete(req, 0);
> > +out:
> > +	if (cpu_queue->queue.qlen)
> > +		queue_work(kcrypto_wq, &cpu_queue->work);
> 
> Again, unclear and needs commentary.
> 
> If we come here via the `goto out;' path above, this CPU queue has no
> more work do do, I think?  If so, why does it requeue itself?

This looks like another vestige from chainiv.

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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