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path: root/drivers/acpi/acpica/tbxface.c
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Diffstat (limited to 'drivers/acpi/acpica/tbxface.c')
-rw-r--r--drivers/acpi/acpica/tbxface.c130
1 files changed, 82 insertions, 48 deletions
diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index d5adb7ac4684..7684707b254b 100644
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -282,7 +282,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_table_header)
/*******************************************************************************
*
- * FUNCTION: acpi_get_table_with_size
+ * FUNCTION: acpi_get_table
*
* PARAMETERS: signature - ACPI signature of needed table
* instance - Which instance (for SSDTs)
@@ -292,16 +292,21 @@ ACPI_EXPORT_SYMBOL(acpi_get_table_header)
*
* DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
* RSDT/XSDT.
+ * Note that an early stage acpi_get_table() call must be paired
+ * with an early stage acpi_put_table() call. otherwise the table
+ * pointer mapped by the early stage mapping implementation may be
+ * erroneously unmapped by the late stage unmapping implementation
+ * in an acpi_put_table() invoked during the late stage.
*
******************************************************************************/
acpi_status
-acpi_get_table_with_size(char *signature,
- u32 instance, struct acpi_table_header **out_table,
- acpi_size *tbl_size)
+acpi_get_table(char *signature,
+ u32 instance, struct acpi_table_header ** out_table)
{
u32 i;
u32 j;
- acpi_status status;
+ acpi_status status = AE_NOT_FOUND;
+ struct acpi_table_desc *table_desc;
/* Parameter validation */
@@ -309,13 +314,22 @@ acpi_get_table_with_size(char *signature,
return (AE_BAD_PARAMETER);
}
+ /*
+ * Note that the following line is required by some OSPMs, they only
+ * check if the returned table is NULL instead of the returned status
+ * to determined if this function is succeeded.
+ */
+ *out_table = NULL;
+
+ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
/* Walk the root table list */
for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
i++) {
- if (!ACPI_COMPARE_NAME
- (&(acpi_gbl_root_table_list.tables[i].signature),
- signature)) {
+ table_desc = &acpi_gbl_root_table_list.tables[i];
+
+ if (!ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
continue;
}
@@ -323,43 +337,65 @@ acpi_get_table_with_size(char *signature,
continue;
}
- status =
- acpi_tb_validate_table(&acpi_gbl_root_table_list.tables[i]);
- if (ACPI_SUCCESS(status)) {
- *out_table = acpi_gbl_root_table_list.tables[i].pointer;
- *tbl_size = acpi_gbl_root_table_list.tables[i].length;
- }
-
- if (!acpi_gbl_permanent_mmap) {
- acpi_gbl_root_table_list.tables[i].pointer = NULL;
- }
-
- return (status);
+ status = acpi_tb_get_table(table_desc, out_table);
+ break;
}
- return (AE_NOT_FOUND);
+ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+ return (status);
}
-ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
+ACPI_EXPORT_SYMBOL(acpi_get_table)
-acpi_status
-acpi_get_table(char *signature,
- u32 instance, struct acpi_table_header **out_table)
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_put_table
+ *
+ * PARAMETERS: table - The pointer to the table
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
+ * Note that it is not safe if this function was invoked after an
+ * uninstallation happened to the original table descriptor.
+ * Currently there is no OSPMs' requirement to handle such
+ * situations.
+ *
+ ******************************************************************************/
+void acpi_put_table(struct acpi_table_header *table)
{
- acpi_size tbl_size;
+ u32 i;
+ struct acpi_table_desc *table_desc;
+
+ ACPI_FUNCTION_TRACE(acpi_put_table);
+
+ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+ /* Walk the root table list */
+
+ for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
+ table_desc = &acpi_gbl_root_table_list.tables[i];
- return acpi_get_table_with_size(signature,
- instance, out_table, &tbl_size);
+ if (table_desc->pointer != table) {
+ continue;
+ }
+
+ acpi_tb_put_table(table_desc);
+ break;
+ }
+
+ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+ return_VOID;
}
-ACPI_EXPORT_SYMBOL(acpi_get_table)
+ACPI_EXPORT_SYMBOL(acpi_put_table)
/*******************************************************************************
*
* FUNCTION: acpi_get_table_by_index
*
* PARAMETERS: table_index - Table index
- * table - Where the pointer to the table is returned
+ * out_table - Where the pointer to the table is returned
*
* RETURN: Status and pointer to the requested table
*
@@ -368,7 +404,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_table)
*
******************************************************************************/
acpi_status
-acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
+acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
{
acpi_status status;
@@ -376,35 +412,33 @@ acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
/* Parameter validation */
- if (!table) {
+ if (!out_table) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
+ /*
+ * Note that the following line is required by some OSPMs, they only
+ * check if the returned table is NULL instead of the returned status
+ * to determined if this function is succeeded.
+ */
+ *out_table = NULL;
+
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
/* Validate index */
if (table_index >= acpi_gbl_root_table_list.current_table_count) {
- (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return_ACPI_STATUS(AE_BAD_PARAMETER);
+ status = AE_BAD_PARAMETER;
+ goto unlock_and_exit;
}
- if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
-
- /* Table is not mapped, map it */
+ status =
+ acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
+ out_table);
- status =
- acpi_tb_validate_table(&acpi_gbl_root_table_list.
- tables[table_index]);
- if (ACPI_FAILURE(status)) {
- (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return_ACPI_STATUS(status);
- }
- }
-
- *table = acpi_gbl_root_table_list.tables[table_index].pointer;
+unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return_ACPI_STATUS(AE_OK);
+ return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)

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