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nfit/ars: Avoid stale ARS results

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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: 0caeef63e6 ("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>
This commit is contained in:
Dan Williams 2019-02-13 09:28:40 -08:00
parent 5479b2757f
commit 78153dd45e
2 changed files with 17 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
drivers/acpi/nfit/core.c
View file

@ -2652,7 +2652,10 @@ static int ars_start(struct acpi_nfit_desc *acpi_desc,
if (rc < 0)
return 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:

1
drivers/acpi/nfit/nfit.h
View file

@ -213,6 +213,7 @@ struct nfit_mem {
enum scrub_flags {
ARS_BUSY,
ARS_CANCEL,
ARS_VALID,
ARS_POLL,
};