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Commit 78153dd4 authored by Dan Williams's avatar Dan Williams
Browse files

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: 0caeef63 ("libnvdimm: Add a poison list and export badblocks")
Cc: <stable@vger.kernel.org>
Reported-by: default avatarKrzysztof Rusocki <krzysztof.rusocki@intel.com>
Reported-by: default avatarVishal Verma <vishal.l.verma@intel.com>
Reviewed-by: default avatarToshi Kani <toshi.kani@hpe.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 5479b275

drivers/acpi/nfit/core.c

+16 −1
Original line number Diff line number Diff line
@@ -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:

drivers/acpi/nfit/nfit.h

+1 −0
Original line number Diff line number Diff line
@@ -213,6 +213,7 @@ struct nfit_mem { 
enum scrub_flags {

	ARS_BUSY,

	ARS_CANCEL,

	ARS_VALID,

	ARS_POLL,

};