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ACPI/nfit: Adjust annotation for why return 0 if fail to find NFIT at start 

Add detailed explanation for why it's ok to return 0 if we fail to find
an NFIT at startup. Refer to chapter 9.20.2 NVDIMM Root Device in ACPI
6.2 spec.

Signed-off-by: Ocean He <hehy1@lenovo.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ocean He 2018-08-07 02:15:31 -04:00 committed by Dan Williams
parent 9bf3aa4464
commit 9f619d4769
1 changed files with 7 additions and 1 deletions
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8
drivers/acpi/nfit/core.c
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@ -3474,7 +3474,13 @@ static int acpi_nfit_add(struct acpi_device *adev)
status = acpi_get_table(ACPI_SIG_NFIT, 0, &tbl);
if (ACPI_FAILURE(status)) {
/* This is ok, we could have an nvdimm hotplugged later */
/* The NVDIMM root device allows OS to trigger enumeration of
* NVDIMMs through NFIT at boot time and re-enumeration at
* root level via the _FIT method during runtime.
* This is ok to return 0 here, we could have an nvdimm
* hotplugged later and evaluate _FIT method which returns
* data in the format of a series of NFIT Structures.
*/
dev_dbg(dev, "failed to find NFIT at startup\n");
return 0;
}