nfit: skip region registration for incomplete control regions

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commit 0731de476a upstream.

Per the ACPI specification the only functional purpose for a DIMM
Control Region to be mapped into the system physical address space, from
an OSPM perspective, is to support block-apertures. However, there are
some BIOSen that publish DIMM Control Region SPA entries for pre-boot
environment consumption.  Undo the kernel policy of generating disabled
'ndblk' regions when this configuration is detected.

Cc: <stable@vger.kernel.org>
Fixes: 1f7df6f88b ("libnvdimm, nfit: regions (block-data-window...)")
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Dan Williams 2018-03-21 21:22:34 -07:00 • committed by Greg Kroah-Hartman

parent 5520091356

commit 4171ea2471

1 changed files with 6 additions and 7 deletions

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drivers/acpi/nfit/core.c

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