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| author | Ocean He <hehy1@lenovo.com> | 2018-08-07 02:15:31 -0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2018-12-10 15:41:50 -0800 |
| commit | 9f619d4769a22b1c2f9d8687adbbe4baae12c375 (patch) | |
| tree | db66e1ee32ba5f436d3ff4ba7d4542514bca62de /drivers/acpi/nfit/core.c | |
| parent | 9bf3aa44644721b287724ecac835d38f1dae4e2d (diff) | |
| download | linux-9f619d4769a22b1c2f9d8687adbbe4baae12c375.tar.gz linux-9f619d4769a22b1c2f9d8687adbbe4baae12c375.tar.bz2 linux-9f619d4769a22b1c2f9d8687adbbe4baae12c375.zip | |
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>
Diffstat (limited to 'drivers/acpi/nfit/core.c')
| -rw-r--r-- | drivers/acpi/nfit/core.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 5912d30020c7..59dd07c94f12 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -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; } |