From: Bob Moore robert.moore@intel.com
[ Upstream commit 8b1cafdcb4b75c5027c52f1e82b47ebe727ad7ed ]
These address spaces are defined by the ACPI spec to be "always available", and thus _REG should never be run on them. Provides compatibility with other ACPI implementations.
Signed-off-by: Bob Moore robert.moore@intel.com Signed-off-by: Erik Schmauss erik.schmauss@intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/acpica/acevents.h | 2 ++ drivers/acpi/acpica/aclocal.h | 2 +- drivers/acpi/acpica/evregion.c | 17 +++++++++++++++-- drivers/acpi/acpica/evrgnini.c | 6 +----- drivers/acpi/acpica/evxfregn.c | 1 - 5 files changed, 19 insertions(+), 9 deletions(-)
diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h index 298180bf7e3c1..bfcc68b9f708d 100644 --- a/drivers/acpi/acpica/acevents.h +++ b/drivers/acpi/acpica/acevents.h @@ -230,6 +230,8 @@ acpi_ev_default_region_setup(acpi_handle handle,
acpi_status acpi_ev_initialize_region(union acpi_operand_object *region_obj);
+u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node); + /* * evsci - SCI (System Control Interrupt) handling/dispatch */ diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h index 0f28a38a43ea1..99b0da8991098 100644 --- a/drivers/acpi/acpica/aclocal.h +++ b/drivers/acpi/acpica/aclocal.h @@ -395,9 +395,9 @@ struct acpi_simple_repair_info { /* Info for running the _REG methods */
struct acpi_reg_walk_info { - acpi_adr_space_type space_id; u32 function; u32 reg_run_count; + acpi_adr_space_type space_id; };
/***************************************************************************** diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c index 70c2bd169f669..49decca4e08ff 100644 --- a/drivers/acpi/acpica/evregion.c +++ b/drivers/acpi/acpica/evregion.c @@ -653,6 +653,19 @@ acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
+ /* + * These address spaces do not need a call to _REG, since the ACPI + * specification defines them as: "must always be accessible". Since + * they never change state (never become unavailable), no need to ever + * call _REG on them. Also, a data_table is not a "real" address space, + * so do not call _REG. September 2018. + */ + if ((space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) || + (space_id == ACPI_ADR_SPACE_SYSTEM_IO) || + (space_id == ACPI_ADR_SPACE_DATA_TABLE)) { + return_VOID; + } + info.space_id = space_id; info.function = function; info.reg_run_count = 0; @@ -714,8 +727,8 @@ acpi_ev_reg_run(acpi_handle obj_handle, }
/* - * We only care about regions.and objects that are allowed to have address - * space handlers + * We only care about regions and objects that are allowed to have + * address space handlers */ if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) { return (AE_OK); diff --git a/drivers/acpi/acpica/evrgnini.c b/drivers/acpi/acpica/evrgnini.c index 39284deedd885..17df5dacd43cf 100644 --- a/drivers/acpi/acpica/evrgnini.c +++ b/drivers/acpi/acpica/evrgnini.c @@ -16,9 +16,6 @@ #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evrgnini")
-/* Local prototypes */ -static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node); - /******************************************************************************* * * FUNCTION: acpi_ev_system_memory_region_setup @@ -33,7 +30,6 @@ static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node); * DESCRIPTION: Setup a system_memory operation region * ******************************************************************************/ - acpi_status acpi_ev_system_memory_region_setup(acpi_handle handle, u32 function, @@ -313,7 +309,7 @@ acpi_ev_pci_config_region_setup(acpi_handle handle, * ******************************************************************************/
-static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node) +u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node) { acpi_status status; struct acpi_pnp_device_id *hid; diff --git a/drivers/acpi/acpica/evxfregn.c b/drivers/acpi/acpica/evxfregn.c index 091415b14fbf1..3b3a25d9f0e6d 100644 --- a/drivers/acpi/acpica/evxfregn.c +++ b/drivers/acpi/acpica/evxfregn.c @@ -193,7 +193,6 @@ acpi_remove_address_space_handler(acpi_handle device, */ region_obj = handler_obj->address_space.region_list; - }
/* Remove this Handler object from the list */