[PATCH v2 0/5] soundwire: Fix bandwidth leak in multi-link aggregation failure

[Bard Liao]

The existing code only copies the params from the first link to the
bus params, but it doesn't copy the bandwidth from the other links.
This can lead to a bandwidth leak when multi-link aggregation fails.
Fix this by saving a snapshot of each bus's parameters before making
any modifications.

Changes in v2:
- Fix lane and rate group handling in the generic bandwidth allocation
that the rollback depends on:
  - Pass the prepare/deprepare context to compute_params().
  - Select the runtime of the stream being prepared for lane allocation
    instead of the first runtime on the bus, which could be an already
    running stream.
  - Include the current stream in the group and port computation when
    it is prepared again from the DEPREPARED state.
- Reset the lane of the stream being prepared to 0 when no multi-lane
is selected, so the lane assignment matches the restored lane_used_bandwidth.

Bard Liao (4):
  soundwire: move lane bandwidth into bus params
  soundwire: Pass prepare context to parameter computation
  soundwire: Select the correct runtime for lane allocation
  soundwire: Include the current stream when preparing again

David Lin (1):
  soundwire: stream: Fix bandwidth leak in multi-link aggregation
    failure

 drivers/soundwire/amd_manager.c               |  3 +-
 drivers/soundwire/bus.h                       |  3 +
 .../soundwire/generic_bandwidth_allocation.c  | 81 ++++++++++++++-----
 drivers/soundwire/qcom.c                      |  3 +-
 drivers/soundwire/stream.c                    | 25 ++++--
 include/linux/soundwire/sdw.h                 | 13 +--
 6 files changed, 92 insertions(+), 36 deletions(-)

-- 
2.43.0