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acpi/nfit: queue issuing of ars when an uc error notification comes in 

When the ACPI UC error notifier gets called and ARS_REQ bit is set
with the passed in flag, we can receive -EBUSY if ARS_REQ bit is already
set for the nfit_spa->ars_state. When that happens, the ARS request is
dropped. That can potentially cause us to miss the unreported errors that
the on going ARS request does not receive. Add an ARS_REQ_REDO state that
will request short ARS upon ARS completion to grab any errors we missed.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Dave Jiang 2018-07-27 09:04:17 -07:00
parent 1e687220ef
commit cc3d3458d4
2 changed files with 10 additions and 3 deletions
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12
drivers/acpi/nfit/core.c
View File

@ -2567,7 +2567,12 @@ static void ars_complete(struct acpi_nfit_desc *acpi_desc,
test_bit(ARS_SHORT, &nfit_spa->ars_state)
? "short" : "long");
clear_bit(ARS_SHORT, &nfit_spa->ars_state);
set_bit(ARS_DONE, &nfit_spa->ars_state);
if (test_and_clear_bit(ARS_REQ_REDO, &nfit_spa->ars_state)) {
set_bit(ARS_SHORT, &nfit_spa->ars_state);
set_bit(ARS_REQ, &nfit_spa->ars_state);
dev_dbg(dev, "ARS: processing scrub request received while in progress\n");
} else
set_bit(ARS_DONE, &nfit_spa->ars_state);
}
static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc)
@ -3242,9 +3247,10 @@ int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, unsigned long flags)
if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
continue;
if (test_and_set_bit(ARS_REQ, &nfit_spa->ars_state))
if (test_and_set_bit(ARS_REQ, &nfit_spa->ars_state)) {
busy++;
else {
set_bit(ARS_REQ_REDO, &nfit_spa->ars_state);
} else {
if (test_bit(ARS_SHORT, &flags))
set_bit(ARS_SHORT, &nfit_spa->ars_state);
scheduled++;

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

@ -119,6 +119,7 @@ enum nfit_dimm_notifiers {
enum nfit_ars_state {
ARS_REQ,
ARS_REQ_REDO,
ARS_DONE,
ARS_SHORT,
ARS_FAILED,