[PATCH v3 0/6] Fixes and rework for paes_s390

[Harald Freudenberger <freude@linux.ibm.com>]

Fix and rework some issues around arch/s390/paes_s390.c:

- Fix skcipher_walk return code handling in paes_s390
- Add scrub of some temp buffers
- Shift from using a mutex to using a semaphore in PAES CTR
  Surprisingly clang code analysis is able to deal with semaphores and
  thus the shift also fixes the issue with CONTEXT_ANALYSIS enabled.
- And some more fixes related to paes (see changelog).

For more details please see patch headers.

Changelog:

v1: initial version - however, all these patches are follow up patches
    from a similar patch queue for aes_s390.c
v2: - On one error path in the CTR implementation the scrubbing of a
      temp buffer could be bypassed. Also checked Sashikos claim about
      possible double free but this is not the case.
    - All paes algorithms did not set any base.cra_flags. So now set
      the ASYNC and the NO_FALLBACK flag.
    - If a request is pushed to the crypto engine there is another
      return code EBUSY also indicating success but the code handled
      this as a failure.
    - The very same was with the phmac implementation. So corrected
      the return code handling there as well.   
v3: - Reworked the -EBUSY handling in paes and phmac again. The
      synchronous path could have emitted -EBUSY also and would have
      triggered the failure handling. So map -EBUSY to -EINPROGRESS.

Harald Freudenberger (6):
  s390/crypto: Fix return code handling at skcipher_walk_done in PAES
    algorithms
  s390/crypto: Fix missing scrub of temp buffers with PAES algorithm
  s390/crypto: Fix use of mutex in atomic context in PAES
  s390/crypto: Fix missing cra_flags in paes_s390
  s390/crypto: Fix handling of EBUSY in PAES when req is pushed to
    crypto engine
  s390/crypto: Fix handling of EBUSY in PHMAC when req is pushed to
    crypto engine

 arch/s390/crypto/paes_s390.c  | 68 +++++++++++++++++++++++++----------
 arch/s390/crypto/phmac_s390.c |  6 ++++
 2 files changed, 55 insertions(+), 19 deletions(-)


base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff
--
2.43.0