diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2019-02-13 09:28:40 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-02-20 14:18:59 -0800 |
| commit | 78153dd45e7e0596ba32b15d02bda08e1513111e (patch) | |
| tree | 2d3cf972ea3713136530f3dbcdd4981a014faa43 /drivers/acpi/nfit | |
| parent | 5479b2757f26fe9908fc341d105b2097fe820b6f (diff) | |
| download | linux-78153dd45e7e0596ba32b15d02bda08e1513111e.tar.gz linux-78153dd45e7e0596ba32b15d02bda08e1513111e.tar.bz2 linux-78153dd45e7e0596ba32b15d02bda08e1513111e.zip | |
nfit/ars: Avoid stale ARS results
Gate ARS result consumption on whether the OS issued start-ARS since the
previous consumption. The BIOS may only clear its result buffers after a
successful start-ARS.
Fixes: 0caeef63e6d2 ("libnvdimm: Add a poison list and export badblocks")
Cc: <stable@vger.kernel.org>
Reported-by: Krzysztof Rusocki <krzysztof.rusocki@intel.com>
Reported-by: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/acpi/nfit')
| -rw-r--r-- | drivers/acpi/nfit/core.c | 17 | ||||
| -rw-r--r-- | drivers/acpi/nfit/nfit.h | 1 |
2 files changed, 17 insertions, 1 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 629cf91649d2..5c9eb8d700d3 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -2652,7 +2652,10 @@ static int ars_start(struct acpi_nfit_desc *acpi_desc, if (rc < 0) return rc; - return cmd_rc; + if (cmd_rc < 0) + return cmd_rc; + set_bit(ARS_VALID, &acpi_desc->scrub_flags); + return 0; } static int ars_continue(struct acpi_nfit_desc *acpi_desc) @@ -2745,6 +2748,17 @@ static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc) */ if (ars_status->out_length < 44) return 0; + + /* + * Ignore potentially stale results that are only refreshed + * after a start-ARS event. + */ + if (!test_and_clear_bit(ARS_VALID, &acpi_desc->scrub_flags)) { + dev_dbg(acpi_desc->dev, "skip %d stale records\n", + ars_status->num_records); + return 0; + } + for (i = 0; i < ars_status->num_records; i++) { /* only process full records */ if (ars_status->out_length @@ -3229,6 +3243,7 @@ static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc) struct nfit_spa *nfit_spa; int rc; + set_bit(ARS_VALID, &acpi_desc->scrub_flags); list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { switch (nfit_spa_type(nfit_spa->spa)) { case NFIT_SPA_VOLATILE: diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index d14bad687fb8..0cbe5009eb2c 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -213,6 +213,7 @@ struct nfit_mem { enum scrub_flags { ARS_BUSY, ARS_CANCEL, + ARS_VALID, ARS_POLL, }; |