diff options
| author | Bob Moore <robert.moore@intel.com> | 2015-07-01 14:44:31 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-07-01 23:17:54 +0200 |
| commit | 8ea98655775e904ea406d74a887d0b2254651b5a (patch) | |
| tree | 06414a7a2a98370bbec306ceb7083484cdeaf88d | |
| parent | fe536995f2fe26fff111a9a06bf3f71e179c92cf (diff) | |
| download | linux-8ea98655775e904ea406d74a887d0b2254651b5a.tar.bz2 | |
ACPICA: Namespace: Change namespace override to avoid node deletion
ACPICA commit c0ce529e1fbb8ec47d2522a3aa10f3ab77e16e41
There is no reference counting implemented for struct acpi_namespace_node, so it
is currently not removable during runtime.
This patch changes the namespace override code to keep the old
struct acpi_namespace_node undeleted so that the override mechanism can happen
during runtime. Bob Moore.
Link: https://github.com/acpica/acpica/commit/c0ce529e
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/nssearch.c | 23 | ||||
| -rw-r--r-- | include/acpi/acpixf.h | 5 |
2 files changed, 24 insertions, 4 deletions
diff --git a/drivers/acpi/acpica/nssearch.c b/drivers/acpi/acpica/nssearch.c index 47fbe5b33524..d73904013830 100644 --- a/drivers/acpi/acpica/nssearch.c +++ b/drivers/acpi/acpica/nssearch.c @@ -331,13 +331,28 @@ acpi_ns_search_and_enter(u32 target_name, /* * If the namespace override feature is enabled for this node, - * delete any existing node. This can only happen during the - * boot stage, thus it is safe to remove the node here. + * delete any existing attached sub-object and make the node + * look like a new node that is owned by the override table. */ if (flags & ACPI_NS_OVERRIDE_IF_FOUND) { + ACPI_DEBUG_PRINT((ACPI_DB_NAMES, + "Namespace override: %4.4s pass %u type %X Owner %X\n", + ACPI_CAST_PTR(char, + &target_name), + interpreter_mode, + (*return_node)->type, + walk_state->owner_id)); + acpi_ns_delete_children(*return_node); - acpi_ns_remove_node(*return_node); - *return_node = ACPI_ENTRY_NOT_FOUND; + if (acpi_gbl_runtime_namespace_override) { + acpi_ut_remove_reference((*return_node)->object); + (*return_node)->object = NULL; + (*return_node)->owner_id = + walk_state->owner_id; + } else { + acpi_ns_remove_node(*return_node); + *return_node = ACPI_ENTRY_NOT_FOUND; + } } /* Return an error if we don't expect to find the object */ diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h index 213ed7ecfd8d..f6d807170346 100644 --- a/include/acpi/acpixf.h +++ b/include/acpi/acpixf.h @@ -229,6 +229,11 @@ ACPI_INIT_GLOBAL(u8, acpi_gbl_disable_auto_repair, FALSE); ACPI_INIT_GLOBAL(u8, acpi_gbl_disable_ssdt_table_install, FALSE); /* + * Optionally enable runtime namespace override. + */ +ACPI_INIT_GLOBAL(u8, acpi_gbl_runtime_namespace_override, TRUE); + +/* * We keep track of the latest version of Windows that has been requested by * the BIOS. ACPI 5.0. */ |