linux-kernel - Re: [PATCH v2] crypto: stm32/crc32 - Avoid lock if hardware is already used

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Message-ID: <20200925081511.GG6381@gondor.apana.org.au>
Date:   Fri, 25 Sep 2020 18:15:11 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Nicolas Toromanoff <nicolas.toromanoff@...com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Ard Biesheuvel <ardb@...nel.org>, linux-crypto@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] crypto: stm32/crc32 - Avoid lock if hardware is
 already used

On Wed, Sep 16, 2020 at 08:33:44AM +0200, Nicolas Toromanoff wrote:
> If STM32 CRC device is already in use, calculate CRC by software.
> 
> This will release CPU constraint for a concurrent access to the
> hardware, and avoid masking irqs during the whole block processing.
> 
> Fixes: 7795c0baf5ac ("crypto: stm32/crc32 - protect from concurrent accesses")
> 
> Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@...com>
> ---
> v2: select CRC32 and not (CRYPTO_CRC32 and CRYPTO_CRC32C) in Kconfig
> ---
>  drivers/crypto/stm32/Kconfig       |  1 +
>  drivers/crypto/stm32/stm32-crc32.c | 15 ++++++++++++---
>  2 files changed, 13 insertions(+), 3 deletions(-)

Patch applied.  Thanks.
-- 
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