From 2cae4ac6e17ee9ebf5e60d2778b66168bab8340c Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 17 Jun 2019 13:31:45 +0200 Subject: [PATCH] ACPICA: Clear status of GPEs on first direct enable ACPI GPEs (other than the EC one) can be enabled in two situations. First, the GPEs with existing _Lxx and _Exx methods are enabled implicitly by ACPICA during system initialization. Second, the GPEs without these methods (like GPEs listed by _PRW objects for wakeup devices) need to be enabled directly by the code that is going to use them (e.g. ACPI power management or device drivers). In the former case, if the status of a given GPE is set to start with, its handler method (either _Lxx or _Exx) needs to be invoked to take care of the events (possibly) signaled before the GPE was enabled. In the latter case, however, the first caller of acpi_enable_gpe() for a given GPE should not be expected to care about any events that might be signaled through it earlier. In that case, it is better to clear the status of the GPE before enabling it, to prevent stale events from triggering unwanted actions (like spurious system resume, for example). For this reason, modify acpi_ev_add_gpe_reference() to take an additional boolean argument indicating whether or not the GPE status needs to be cleared when its reference counter changes from zero to one and make acpi_enable_gpe() pass TRUE to it through that new argument. Fixes: 634eba8afafa ("ACPICA: Events: Stop unconditionally clearing ACPI IRQs during suspend/resume") Reported-by: Furquan Shaikh Tested-by: Furquan Shaikh Tested-by: Mika Westerberg Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/acevents.h | 3 ++- drivers/acpi/acpica/evgpe.c | 8 +++++++- drivers/acpi/acpica/evgpeblk.c | 2 +- drivers/acpi/acpica/evxface.c | 2 +- drivers/acpi/acpica/evxfgpe.c | 2 +- 5 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h index 831660179662e..c8652f91054eb 100644 --- a/drivers/acpi/acpica/acevents.h +++ b/drivers/acpi/acpica/acevents.h @@ -69,7 +69,8 @@ acpi_status acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked); acpi_status -acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info); +acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info, + u8 clear_on_enable); acpi_status acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info); diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c index 62d3aa74277b4..344feba290635 100644 --- a/drivers/acpi/acpica/evgpe.c +++ b/drivers/acpi/acpica/evgpe.c @@ -146,6 +146,7 @@ acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked) * FUNCTION: acpi_ev_add_gpe_reference * * PARAMETERS: gpe_event_info - Add a reference to this GPE + * clear_on_enable - Clear GPE status before enabling it * * RETURN: Status * @@ -155,7 +156,8 @@ acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked) ******************************************************************************/ acpi_status -acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) +acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info, + u8 clear_on_enable) { acpi_status status = AE_OK; @@ -170,6 +172,10 @@ acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) /* Enable on first reference */ + if (clear_on_enable) { + (void)acpi_hw_clear_gpe(gpe_event_info); + } + status = acpi_ev_update_gpe_enable_mask(gpe_event_info); if (ACPI_SUCCESS(status)) { status = acpi_ev_enable_gpe(gpe_event_info); diff --git a/drivers/acpi/acpica/evgpeblk.c b/drivers/acpi/acpica/evgpeblk.c index 328d1d6123ad6..fb15e9e2373b9 100644 --- a/drivers/acpi/acpica/evgpeblk.c +++ b/drivers/acpi/acpica/evgpeblk.c @@ -453,7 +453,7 @@ acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, continue; } - status = acpi_ev_add_gpe_reference(gpe_event_info); + status = acpi_ev_add_gpe_reference(gpe_event_info, FALSE); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Could not enable GPE 0x%02X", diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c index 3df00eb6621bd..279ef0557aa38 100644 --- a/drivers/acpi/acpica/evxface.c +++ b/drivers/acpi/acpica/evxface.c @@ -971,7 +971,7 @@ acpi_remove_gpe_handler(acpi_handle gpe_device, ACPI_GPE_DISPATCH_METHOD) || (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) == ACPI_GPE_DISPATCH_NOTIFY)) && handler->originally_enabled) { - (void)acpi_ev_add_gpe_reference(gpe_event_info); + (void)acpi_ev_add_gpe_reference(gpe_event_info, FALSE); if (ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) { /* Poll edge triggered GPEs to handle existing events */ diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c index 30a083902f522..710488ec59e99 100644 --- a/drivers/acpi/acpica/evxfgpe.c +++ b/drivers/acpi/acpica/evxfgpe.c @@ -108,7 +108,7 @@ acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number) if (gpe_event_info) { if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) != ACPI_GPE_DISPATCH_NONE) { - status = acpi_ev_add_gpe_reference(gpe_event_info); + status = acpi_ev_add_gpe_reference(gpe_event_info, TRUE); if (ACPI_SUCCESS(status) && ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) { -- 2.39.5