[PATCH v2 0/7] staging: vchiq_core: Refactor vchiq_bulk_transfer() logic

Series mostly refactors vchiq_bulk_transfer() code according
to Arnd's review comment from [1]:

You can also wrap vchiq_bulk_transfer() in order to have
four separate functions based on the different 'mode'
values and have them only take the arguments they actually
need.

I didn't wrap vchiq_bulk_transfer(), instead created four
differnet function, one for each mode.
This will pave the way to address his second comment:

Ideally this should be cleaned up in a way that completely
avoids passing both user and kernel data at the same time.

which is not part of this series and will be done on top as
arguments shuffling will have to fix the sparse warnings
that exists currently.

Patch 1/7 first moves the VCHIQ_BULK_MODE_WAITING logic out
of vchiq_bulk_transfer

Patch 2/7 then moves the core logic to vchiq_bulk_transfer()
which can be shared in subsequent patches

Patch 3/7 and 4/7 refactors remaining bulk transfer modes

Patch 5/7 finally drops the vchiq_bulk_transfer() as not needed

patch 6/7 and 7/7 are drive by patches, noticed during development.

[1]: https://lore.kernel.org/linux-staging/3d3b7368-93b2-4c0d-845e-4099c2de9dc1@app.fastmail.com/ (local)

Changes in v2:
- Directly return if service == NULL in 3/7
- Prefix non-static functions with "vchiq_" (appropriate driver prefix)
- Use typed argument for 'userdata' in 1/7

Umang Jain (7):
  staging: vchiq: Factor out bulk transfer for VCHIQ_BULK_MODE_WAITING
  staging: vchiq_core: Simplify vchiq_bulk_transfer()
  staging: vchiq_core: Factor out bulk transfer for blocking mode
  staging: vchiq_core: Factor out bulk transfer for (no/)callback mode
  staging: vchiq_core: Drop vchiq_bulk_transfer()
  staging: vchiq_core: Remove unused function argument
  staging: vchiq_core: Pass enumerated flag instead of int

 .../interface/vchiq_arm/vchiq_arm.c           |  20 +-
 .../interface/vchiq_arm/vchiq_core.c          | 321 +++++++++++-------
 .../interface/vchiq_arm/vchiq_core.h          |  16 +-
 .../interface/vchiq_arm/vchiq_dev.c           |  15 +-
 4 files changed, 233 insertions(+), 139 deletions(-)

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2.45.2