acpi, nfit: Fix scrub idle detection

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The notification of scrub completion happens within the scrub workqueue.
That can clearly race someone running scrub_show() and work_busy()
before the workqueue has a chance to flush the recently completed work.
Add a flag to reliably indicate the idle vs busy state. Without this
change applications using poll(2) to wait for scrub-completion may
falsely wakeup and read ARS as being busy even though the thread is
going idle and then hang indefinitely.

Fixes: bc6ba80858 ("nfit, address-range-scrub: rework and simplify ARS...")
Cc: <stable@vger.kernel.org>
Reported-by: Vishal Verma <vishal.l.verma@intel.com>
Tested-by: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: Lukasz Dorau <lukasz.dorau@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

...

This commit is contained in:

Dan Williams 2018-07-05 14:58:49 -07:00

parent 1273c253c3

commit 33cc2c9667

2 changed files with 34 additions and 11 deletions

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44

drivers/acpi/nfit/core.c

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1

drivers/acpi/nfit/nfit.h

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