nfit/ars: Allow root to busy-poll the ARS state machine

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The ARS implementation implements exponential back-off on the poll
interval to prevent high-frequency access to the DIMM / platform
interface. Depending on when the ARS completes the poll interval may
exceed the completion event by minutes. Allow root to reset the timeout
each time it probes the status. A one-second timeout is still enforced,
but root can otherwise can control the poll interval.

Fixes: bc6ba80858 ("nfit, address-range-scrub: rework and simplify ARS...")
Cc: <stable@vger.kernel.org>
Reported-by: Erwin Tsaur <erwin.tsaur@oracle.com>
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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Dan Williams 2019-02-13 09:04:07 -08:00

parent e34b8252a3

commit 5479b2757f

2 changed files with 9 additions and 0 deletions

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8

drivers/acpi/nfit/core.c

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1

drivers/acpi/nfit/nfit.h

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