acpi/nfit: Block function zero DSMs
In preparation for using function number 0 as an error value, prevent it
from being considered a valid function value by acpi_nfit_ctl().
Cc: <stable@vger.kernel.org>
Cc: stuart hayes <stuart.w.hayes@gmail.com>
Fixes: e02fb7264d
("nfit: add Microsoft NVDIMM DSM command set...")
Reported-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
hifive-unleashed-5.1
parent
1cd7386549
commit
5e9e38d0db
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@ -1867,6 +1867,13 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
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return 0;
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return 0;
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}
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}
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/*
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* Function 0 is the command interrogation function, don't
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* export it to potential userspace use, and enable it to be
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* used as an error value in acpi_nfit_ctl().
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*/
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dsm_mask &= ~1UL;
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guid = to_nfit_uuid(nfit_mem->family);
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guid = to_nfit_uuid(nfit_mem->family);
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for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
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for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
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if (acpi_check_dsm(adev_dimm->handle, guid,
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if (acpi_check_dsm(adev_dimm->handle, guid,
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