[PATCH v2 0/6] nfit/ars: Improve polling and short-ARS execution

[Dan Williams]

Changes since v1: [1]
* Fix the root poll interval support to avoid a infinite loop condition
  when the polling is faster than the ARS completion.
* Move the introduction of scrub_flags earlier in the series and
  introduce ARS_POLL to fix the above issue.

[1]: https://lists.01.org/pipermail/linux-nvdimm/2019-February/019964.html

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Here is a small pile of updates to better coordinate the Linux ARS state
machine with platform-BIOS implementations. Specifically, take advantage
of opportunities to run short-ARS whenever the ARS interface is found to
be idle at init, always run short-ARS even if no_init_ars is specified,
allow root to reset the exponential backoff polling interval for ARS
completion, and protect the kernel against the consumption of stale ARS
results.

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Dan Williams (6):
      nfit/ars: Attempt a short-ARS whenever the ARS state is idle at boot
      nfit/ars: Attempt short-ARS even in the no_init_ars case
      nfit/ars: Remove ars_start_flags
      nfit/ars: Introduce scrub_flags
      nfit/ars: Allow root to busy-poll the ARS state machine
      nfit/ars: Avoid stale ARS results


 drivers/acpi/nfit/core.c |   70 ++++++++++++++++++++++++++++++++--------------
 drivers/acpi/nfit/nfit.h |   11 +++++--
 2 files changed, 57 insertions(+), 24 deletions(-)