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crypto: stm32/crc32 - Avoid lock if hardware is already used

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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: 7795c0baf5 ("crypto: stm32/crc32 - protect from concurrent accesses")

Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nicolas Toromanoff
2020-09-16 08:33:44 +02:00
committed by Herbert Xu
parent c4c75fcbd8
commit bbf2cb1ea1
2 changed files with 13 additions and 3 deletions
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drivers/crypto/stm32/Kconfig
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@@ -3,6 +3,7 @@ config CRYPTO_DEV_STM32_CRC
tristate "Support for STM32 crc accelerators"
depends on ARCH_STM32
select CRYPTO_HASH
select CRC32
help
This enables support for the CRC32 hw accelerator which can be found
on STMicroelectronics STM32 SOC.