diff options
| author | Lv Zheng <lv.zheng@intel.com> | 2015-12-29 14:02:50 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-01-01 03:47:38 +0100 |
| commit | 1d65d9a7b642b8d1eb201830e0c1cae6231b5c51 (patch) | |
| tree | 10aa28197b4dea8ecc6f01c33ef16c29ced6e086 | |
| parent | 2e1beaf6a91998ad82e11a4c5a7b55b59396983b (diff) | |
| download | linux-1d65d9a7b642b8d1eb201830e0c1cae6231b5c51.tar.gz linux-1d65d9a7b642b8d1eb201830e0c1cae6231b5c51.tar.bz2 linux-1d65d9a7b642b8d1eb201830e0c1cae6231b5c51.zip | |
ACPICA: Events: Fix an issue that region object is re-attached to another scope when it is already attached
ACPICA commit 6ebcb24d3225b6c7715a3ce061c327b4c3a6b76e
The logic in acpi_ev_attach_region() is not correct, it can break address
space handler link. This patch fixes this problem. But be aware that this
fix must be applied along with a region object race issue fix. Lv Zheng.
Link: https://github.com/acpica/acpica/commit/6ebcb24d
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/acpica/evregion.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c index 6717e57604d3..19a4e695555f 100644 --- a/drivers/acpi/acpica/evregion.c +++ b/drivers/acpi/acpica/evregion.c @@ -504,6 +504,12 @@ acpi_ev_attach_region(union acpi_operand_object *handler_obj, ACPI_FUNCTION_TRACE(ev_attach_region); + /* Install the region's handler */ + + if (region_obj->region.handler) { + return_ACPI_STATUS(AE_ALREADY_EXISTS); + } + ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, "Adding Region [%4.4s] %p to address handler %p [%s]\n", acpi_ut_get_node_name(region_obj->region.node), @@ -515,13 +521,6 @@ acpi_ev_attach_region(union acpi_operand_object *handler_obj, region_obj->region.next = handler_obj->address_space.region_list; handler_obj->address_space.region_list = region_obj; - - /* Install the region's handler */ - - if (region_obj->region.handler) { - return_ACPI_STATUS(AE_ALREADY_EXISTS); - } - region_obj->region.handler = handler_obj; acpi_ut_add_reference(handler_obj); |