hwrng: stm32 - rework error handling in stm32_rng_read()

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Try to conceal seed errors when possible. If, despite the error
concealing tries, a seed error is still present, then return an error.

A clock error does not compromise the hardware block and data can
still be read from RNG_DR. Just warn that the RNG clock is too slow
and clear RNG_SR.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Gatien Chevallier 2023-09-21 10:02:57 +02:00 • committed by Herbert Xu

parent 8f1c5227ec

commit b17bc6eb7c

1 changed files with 41 additions and 12 deletions

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drivers/char/hw_random/stm32-rng.c

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