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    acpi, nfit: rework NVDIMM leaf method detection · 466d1493
    Dan Williams 提交于
    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: 4b27db7e ("acpi, nfit: add support for the _LS...")
    Suggested-by: NErik Schmauss <erik.schmauss@intel.com>
    Signed-off-by: NDan Williams <dan.j.williams@intel.com>
    466d1493
nfit.h 7.7 KB