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ACPICA: Events: Fix an issue that region object is re-attached to another scope when it is already attached

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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>
This commit is contained in:
Lv Zheng 2015-12-29 14:02:50 +08:00 committed by Rafael J. Wysocki
parent 2e1beaf6a9
commit 1d65d9a7b6
1 changed files with 6 additions and 7 deletions
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13
drivers/acpi/acpica/evregion.c
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@ -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);