[PATCH iwl-net v5 0/8] Rework usage of the control PF pointer in struct ice_adapter

[Sergey Temerkhanov <sergey.temerkhanov@intel.com>]

Rework usage of the control PF pointer in struct ice_adapter, so that
it is always has a consistent state, since it is global for an adapter.
Utilize RCU for reading the pointer value and atomic operations for
changing it. Zero out the ctrl_pf pointer when the control PF is removed.

Previous version:
https://lists.osuosl.org/pipermail/intel-wired-lan/Week-of-Mon-20260831/056612.html

v1->v2: Rebase onto the latest dev-queue branch
v2->v3: Cosmetic fixes
v3->v4: Add the rw_semaphore to protect the ctrl_pf
v4->v5: Split patches into smaller self-contained parts, tighten potential race
        condition windows, annotate RCU-related code

Sergey Temerkhanov (8):
  ice: Unlink the PTP port before destroying its ps_lock
  ice: Protect the control PF pointer with RCU and a rwsem
  ice: Cache struct ice_hw pointer for split register reads
  ice: Reject PTP access without a control PF
  ice: Clear the control PF pointer when the control PF is removed
  ice: Document control PF lock ordering
  ice: Annotate PTP control PF lock handoff
  ice: Release control PF lock before RCU wait

 drivers/net/ethernet/intel/ice/ice.h          |  42 +++-
 drivers/net/ethernet/intel/ice/ice_adapter.c  |   1 +
 drivers/net/ethernet/intel/ice/ice_adapter.h  |   5 +-
 drivers/net/ethernet/intel/ice/ice_dpll.h     |  17 +-
 drivers/net/ethernet/intel/ice/ice_ptp.c      | 179 +++++++++++++-----
 drivers/net/ethernet/intel/ice/ice_ptp.h      |  11 +-
 drivers/net/ethernet/intel/ice/ice_ptp_hw.c   |  77 ++++++--
 drivers/net/ethernet/intel/ice/ice_ptp_hw.h   |   6 +-
 drivers/net/ethernet/intel/ice/ice_txclk.c    |  20 +-
 .../net/ethernet/intel/ice/virt/virtchnl.c    |   5 +-
 10 files changed, 283 insertions(+), 80 deletions(-)

-- 
2.53.0