Merge tag 'scmi-updates-7.3' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into soc/drivers

Arm SCMI updates/fixes for v7.3

A collection of SCMI core and transport fixes addressing resource
lifetimes, teardown races and error handling. Most of these issues
are reported by Sashiko as existing issues while reviewing new feature
additions to SCMI.

The changes:
- publish channel state before mailbox and SMC callbacks can run,
- quiesce notification work before tearing down transport channels,
- fix partial channel setup and mailbox allocation cleanup,
- make IDR iteration and shared-channel teardown safe,
- correct SCMI device, OF node, handle, bus ID and SystemPower lifetimes;,
- harden requested-device registration and removal against races and
  partial failures,
- reject out-of-range DT protocol IDs, and
- simplify notification allocations using flexible arrays.

* tag 'scmi-updates-7.3' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux: (25 commits)
  firmware: arm_scmi: Unrequest devices if driver registration fails
  firmware: arm_scmi: Roll back partial protocol table registration
  firmware: arm_scmi: Fix requested device removal race
  firmware: arm_scmi: Fix transport device teardown lookup
  firmware: arm_scmi: Fix SCMI device destroy lifetimes
  firmware: arm_scmi: Unwind P2A receiver mailbox setup failure
  firmware: arm_scmi: Unwind TX receiver mailbox setup failure
  firmware: arm_scmi: Fix OF node reference handling
  firmware: arm_scmi: Clear SystemPower flag on create failure
  firmware: arm_scmi: Drop handle on protocol bind failures
  firmware: arm_scmi: Protect device request lookup with RCU
  firmware: arm_scmi: Use channel ID for transport teardown
  firmware: arm_scmi: Reject out of range DT protocol IDs
  firmware: arm_scmi: Avoid IDR updates while cleaning channels
  firmware: arm_scmi: Free transport channel on IDR failure
  firmware: arm_scmi: Clean up channels on setup failure
  firmware: arm_scmi: Quiesce notifications before teardown
  firmware: arm_scmi: Unregister device notifier before IDR teardown
  firmware: arm_scmi: Publish channel state before callbacks
  firmware: arm_scmi: Simplify notification allocations
  ...

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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