tree 64f01a6dcb817b41fc694dc2a31999650c91a3c1
parent 1273c253c32b9a073a4d8921ed079177ccc7c8af
author Dan Williams <dan.j.williams@intel.com> 1530827929 -0700
committer Dan Williams <dan.j.williams@intel.com> 1530844433 -0700

acpi, nfit: Fix scrub idle detection

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: bc6ba8085842 ("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>