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path: root/drivers/acpi/acpica/tbinstal.c
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Diffstat (limited to 'drivers/acpi/acpica/tbinstal.c')
-rw-r--r--drivers/acpi/acpica/tbinstal.c82
1 files changed, 69 insertions, 13 deletions
diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
index 37374b21969..f865d5a096d 100644
--- a/drivers/acpi/acpica/tbinstal.c
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -103,7 +103,9 @@ acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
*
* RETURN: Status
*
- * DESCRIPTION: This function is called to add the ACPI table
+ * DESCRIPTION: This function is called to add an ACPI table. It is used to
+ * dynamically load tables via the Load and load_table AML
+ * operators.
*
******************************************************************************/
@@ -112,6 +114,7 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
{
u32 i;
acpi_status status = AE_OK;
+ struct acpi_table_header *override_table = NULL;
ACPI_FUNCTION_TRACE(tb_add_table);
@@ -201,6 +204,29 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
}
}
+ /*
+ * ACPI Table Override:
+ * Allow the host to override dynamically loaded tables.
+ */
+ status = acpi_os_table_override(table_desc->pointer, &override_table);
+ if (ACPI_SUCCESS(status) && override_table) {
+ ACPI_INFO((AE_INFO,
+ "%4.4s @ 0x%p Table override, replaced with:",
+ table_desc->pointer->signature,
+ ACPI_CAST_PTR(void, table_desc->address)));
+
+ /* We can delete the table that was passed as a parameter */
+
+ acpi_tb_delete_table(table_desc);
+
+ /* Setup descriptor for the new table */
+
+ table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
+ table_desc->pointer = override_table;
+ table_desc->length = override_table->length;
+ table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
+ }
+
/* Add the table to the global root table list */
status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
@@ -247,8 +273,9 @@ acpi_status acpi_tb_resize_root_table_list(void)
/* Increase the Table Array size */
tables = ACPI_ALLOCATE_ZEROED(((acpi_size) acpi_gbl_root_table_list.
- size + ACPI_ROOT_TABLE_SIZE_INCREMENT)
- * sizeof(struct acpi_table_desc));
+ size +
+ ACPI_ROOT_TABLE_SIZE_INCREMENT) *
+ sizeof(struct acpi_table_desc));
if (!tables) {
ACPI_ERROR((AE_INFO,
"Could not allocate new root table array"));
@@ -407,27 +434,56 @@ void acpi_tb_terminate(void)
*
* PARAMETERS: table_index - Table index
*
- * RETURN: None
+ * RETURN: Status
*
* DESCRIPTION: Delete all namespace objects created when this table was loaded.
*
******************************************************************************/
-void acpi_tb_delete_namespace_by_owner(u32 table_index)
+acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
{
acpi_owner_id owner_id;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ if (table_index >= acpi_gbl_root_table_list.count) {
+
+ /* The table index does not exist */
- (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
- if (table_index < acpi_gbl_root_table_list.count) {
- owner_id =
- acpi_gbl_root_table_list.tables[table_index].owner_id;
- } else {
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return;
+ return_ACPI_STATUS(AE_NOT_EXIST);
}
+ /* Get the owner ID for this table, used to delete namespace nodes */
+
+ owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+
+ /*
+ * Need to acquire the namespace writer lock to prevent interference
+ * with any concurrent namespace walks. The interpreter must be
+ * released during the deletion since the acquisition of the deletion
+ * lock may block, and also since the execution of a namespace walk
+ * must be allowed to use the interpreter.
+ */
+ acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
+ status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
+
acpi_ns_delete_namespace_by_owner(owner_id);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
+ return_ACPI_STATUS(status);
}
/*******************************************************************************
@@ -535,8 +591,8 @@ u8 acpi_tb_is_table_loaded(u32 table_index)
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
if (table_index < acpi_gbl_root_table_list.count) {
is_loaded = (u8)
- (acpi_gbl_root_table_list.tables[table_index].
- flags & ACPI_TABLE_IS_LOADED);
+ (acpi_gbl_root_table_list.tables[table_index].flags &
+ ACPI_TABLE_IS_LOADED);
}
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);