• Herbert Xu's avatar
    crypto: hash - Add real ahash walk interface · 75ecb231
    Herbert Xu authored
    Although the existing hash walk interface has already been used
    by a number of ahash crypto drivers, it turns out that none of
    them were really asynchronous.  They were all essentially polling
    for completion.
    
    That's why nobody has noticed until now that the walk interface
    couldn't work with a real asynchronous driver since the memory
    is mapped using kmap_atomic.
    
    As we now have a use-case for a real ahash implementation on x86,
    this patch creates a minimal ahash walk interface.  Basically it
    just calls kmap instead of kmap_atomic and does away with the
    crypto_yield call.  Real ahash crypto drivers don't need to yield
    since by definition they won't be hogging the CPU.
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    75ecb231
hash.h 6.17 KB