[PATCH v4 0/3] Fixes and rework for aes_s390

Fix and rework some issues around arch/s390/aes_s390.c:

- Fix skcipher_walk return code handling in aes_s390
- Add scrub of some temp buffers
- Shift from using a mutex to using a semaphore in AES CTR

For more details please see patch headers.

Changelog:

v1: initial version
v2: Fix missing scrub on a temp buffer used to process left over bytes
    in CTR mode.
v3: - Yet another buffer scrubbing was missing. Added to the 2nd 
      patch and rephrased commit header.
    - Added patch to fix one warning with context analysis regarding
      the handling of a mutex with the AES CTR implementation.
v4: - Sashiko found yet another buffer which was not scrubbed.
    - New patch #3 which shifts from using a mutex to using a
      semaphore in AES CTR as this algorithm may be invoked in
      atomic/interrupt context.
    - With the shift to a semaphore now clang is able to do the
      context analysis. So the patch from v3 which reworked the CTR
      implementation is not needed any more. Note that paes still has
      the issue with clang context analysis, but this will be
      addressed in another patch series.

Harald Freudenberger (3):
  s390/crypto: Fix skcipher_walk return code handling in aes_s390
  s390/crypto: Fix missing scrub of temp buffers with AES ctr and gcm
    algorithm
  s390/crypto: Fix use of mutex in atomic context

 arch/s390/crypto/aes_s390.c | 39 +++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 15 deletions(-)


base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff
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2.43.0