linux-kernel - Re: [PATCH 1/2] padata: always acquire cpu_hotplug

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Message-ID: <20190821064349.GA22104@gondor.apana.org.au>
Date:   Wed, 21 Aug 2019 16:43:49 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] padata: always acquire cpu_hotplug_lock before
 pinst->lock

On Wed, Aug 21, 2019 at 12:14:19AM -0400, Daniel Jordan wrote:
>
> I'll try fixing the flushing with Steffen's refcounting idea assuming he hasn't already started on that.  So we're on the same page, the problem is that if padata's ->parallel() punts to a cryptd thread, flushing the parallel work will return immediately without necessarily indicating the parallel job is finished, so flushing is pointless and padata_replace needs to wait till the instance's refcount drops to 0.  Did I get it right?

Yeah you can never flush an async crypto job.  You have to wait
for it to finish.

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