[PATCH 5.4 115/214] ACPI: EC: PM: Flush EC work unconditionally after wakeup

From: Greg Kroah-Hartman
Date: Tue Nov 03 2020 - 15:58:21 EST


From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

commit 5e92442bb4121562231e6daf8a2d1306cb5f8805 upstream.

Commit 607b9df63057 ("ACPI: EC: PM: Avoid flushing EC work when EC
GPE is inactive") has been reported to cause some power button wakeup
events to be missed on some systems, so modify acpi_ec_dispatch_gpe()
to call acpi_ec_flush_work() unconditionally to effectively reverse
the changes made by that commit.

Also note that the problem which prompted commit 607b9df63057 is not
reproducible any more on the affected machine.

Fixes: 607b9df63057 ("ACPI: EC: PM: Avoid flushing EC work when EC GPE is inactive")
Reported-by: Raymond Tan <raymond.tan@xxxxxxxxx>
Cc: 5.4+ <stable@xxxxxxxxxxxxxxx> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/acpi/ec.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1976,12 +1976,11 @@ bool acpi_ec_dispatch_gpe(void)
* to allow the caller to process events properly after that.
*/
ret = acpi_dispatch_gpe(NULL, first_ec->gpe);
- if (ret == ACPI_INTERRUPT_HANDLED) {
+ if (ret == ACPI_INTERRUPT_HANDLED)
pm_pr_dbg("EC GPE dispatched\n");

- /* Flush the event and query workqueues. */
- acpi_ec_flush_work();
- }
+ /* Flush the event and query workqueues. */
+ acpi_ec_flush_work();

return false;
}