acpi, nfit: rework NVDIMM leaf method detection

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Some BIOSen do not handle 0-byte transfer lengths for the _LSR and _LSW
(label storage read/write) methods. This causes Linux to fallback to the
deprecated _DSM path, or otherwise disable label support.

Introduce acpi_nvdimm_has_method() to detect whether a method is
available rather than calling the method, require _LSI and _LSR to be
paired, and require read support before enabling write support.

Cc: <stable@vger.kernel.org>
Fixes: 4b27db7e26 ("acpi, nfit: add support for the _LS...")
Suggested-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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This commit is contained in:

Dan Williams 2018-03-28 10:44:50 -07:00

parent 0731de476a

commit 466d1493ea

2 changed files with 23 additions and 23 deletions

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41

drivers/acpi/nfit/core.c

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5

drivers/acpi/nfit/nfit.h

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