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

[Christophe LEROY]

Le 19/02/2018 à 09:30, Horia Geantă a écrit :
> 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.
> 

And what about ALGIF path from user space ?
What if the user never calls the last sendmsg() which will call 
hash_finup() ?

Christophe