linux-kernel - Re: [PATCH 16/18] crypto: talitos - do hw_context DMA mapping outside the requests

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Date:   Mon, 19 Feb 2018 08:30:49 +0000
From:   Horia Geant <horia.geanta@....com>
To:     Christophe LEROY <christophe.leroy@....fr>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 16/18] crypto: talitos - do hw_context DMA mapping outside
 the requests

On 2/19/2018 9:58 AM, Christophe LEROY wrote:
> Le 18/02/2018 à 18:14, Horia Geantă a écrit :
>> There is no ahash_exit() callback mirroring ahash_init().
>>
>> The clean-up of request ctx should be done in the last states of the hash flows
>> described here:
>> https://www.kernel.org/doc/html/latest/crypto/devel-algos.html#cipher-definition-with-struct-shash-alg-and-ahash-alg
>> for e.g. in the final() callback.
> 
> Unfortunatly it seems that we can't rely on those finalising functions 
> being called all the time.
> If you look into test_ahash_jiffies() for instance, in case of error the 
> call of crypto_hash_final() is skipped.

If test_ahash_jiffies() errors before calling crypto_ahash_final(req), this
means a previous callback failed.
Accordingly, DMA unmapping should be performed also on the corresponding errors
paths in the driver.

Horia