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@@ -49,73 +49,6 @@
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#define _COMPONENT ACPI_NAMESPACE
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsnames")
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ACPI_MODULE_NAME("nsnames")
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-/*******************************************************************************
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- *
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- * FUNCTION: acpi_ns_build_external_path
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- *
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- * PARAMETERS: node - NS node whose pathname is needed
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- * size - Size of the pathname
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- * *name_buffer - Where to return the pathname
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- *
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- * RETURN: Status
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- * Places the pathname into the name_buffer, in external format
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- * (name segments separated by path separators)
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- *
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- * DESCRIPTION: Generate a full pathaname
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- *
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- ******************************************************************************/
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-acpi_status
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-acpi_ns_build_external_path(struct acpi_namespace_node *node,
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- acpi_size size, char *name_buffer)
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-{
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- acpi_size index;
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- struct acpi_namespace_node *parent_node;
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-
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- ACPI_FUNCTION_ENTRY();
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-
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- /* Special case for root */
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-
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- index = size - 1;
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- if (index < ACPI_NAME_SIZE) {
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- name_buffer[0] = AML_ROOT_PREFIX;
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- name_buffer[1] = 0;
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- return (AE_OK);
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- }
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-
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- /* Store terminator byte, then build name backwards */
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-
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- parent_node = node;
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- name_buffer[index] = 0;
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-
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- while ((index > ACPI_NAME_SIZE) && (parent_node != acpi_gbl_root_node)) {
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- index -= ACPI_NAME_SIZE;
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-
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- /* Put the name into the buffer */
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-
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- ACPI_MOVE_32_TO_32((name_buffer + index), &parent_node->name);
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- parent_node = parent_node->parent;
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-
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- /* Prefix name with the path separator */
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-
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- index--;
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- name_buffer[index] = ACPI_PATH_SEPARATOR;
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- }
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-
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- /* Overwrite final separator with the root prefix character */
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-
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- name_buffer[index] = AML_ROOT_PREFIX;
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-
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- if (index != 0) {
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- ACPI_ERROR((AE_INFO,
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- "Could not construct external pathname; index=%u, size=%u, Path=%s",
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- (u32) index, (u32) size, &name_buffer[size]));
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-
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- return (AE_BAD_PARAMETER);
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- }
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-
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- return (AE_OK);
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-}
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-
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/*******************************************************************************
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/*******************************************************************************
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*
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*
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* FUNCTION: acpi_ns_get_external_pathname
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* FUNCTION: acpi_ns_get_external_pathname
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@@ -130,37 +63,13 @@ acpi_ns_build_external_path(struct acpi_namespace_node *node,
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* for error and debug statements.
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* for error and debug statements.
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*
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*
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******************************************************************************/
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******************************************************************************/
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-
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char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
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char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
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{
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{
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- acpi_status status;
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char *name_buffer;
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char *name_buffer;
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- acpi_size size;
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ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node);
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ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node);
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- /* Calculate required buffer size based on depth below root */
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-
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- size = acpi_ns_get_pathname_length(node);
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- if (!size) {
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- return_PTR(NULL);
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- }
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-
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- /* Allocate a buffer to be returned to caller */
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-
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- name_buffer = ACPI_ALLOCATE_ZEROED(size);
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- if (!name_buffer) {
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- ACPI_ERROR((AE_INFO, "Could not allocate %u bytes", (u32)size));
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- return_PTR(NULL);
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- }
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-
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- /* Build the path in the allocated buffer */
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-
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- status = acpi_ns_build_external_path(node, size, name_buffer);
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- if (ACPI_FAILURE(status)) {
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- ACPI_FREE(name_buffer);
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- return_PTR(NULL);
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- }
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+ name_buffer = acpi_ns_get_normalized_pathname(node, FALSE);
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return_PTR(name_buffer);
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return_PTR(name_buffer);
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}
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}
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@@ -180,33 +89,12 @@ char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
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acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
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acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
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{
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{
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acpi_size size;
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acpi_size size;
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- struct acpi_namespace_node *next_node;
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ACPI_FUNCTION_ENTRY();
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ACPI_FUNCTION_ENTRY();
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- /*
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- * Compute length of pathname as 5 * number of name segments.
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- * Go back up the parent tree to the root
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- */
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- size = 0;
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- next_node = node;
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+ size = acpi_ns_build_normalized_path(node, NULL, 0, FALSE);
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- while (next_node && (next_node != acpi_gbl_root_node)) {
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- if (ACPI_GET_DESCRIPTOR_TYPE(next_node) != ACPI_DESC_TYPE_NAMED) {
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- ACPI_ERROR((AE_INFO,
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- "Invalid Namespace Node (%p) while traversing namespace",
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- next_node));
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- return (0);
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- }
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- size += ACPI_PATH_SEGMENT_LENGTH;
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- next_node = next_node->parent;
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- }
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-
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- if (!size) {
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- size = 1; /* Root node case */
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- }
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-
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- return (size + 1); /* +1 for null string terminator */
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+ return (size);
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}
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}
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/*******************************************************************************
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/*******************************************************************************
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@@ -216,6 +104,8 @@ acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
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* PARAMETERS: target_handle - Handle of named object whose name is
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* PARAMETERS: target_handle - Handle of named object whose name is
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* to be found
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* to be found
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* buffer - Where the pathname is returned
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* buffer - Where the pathname is returned
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+ * no_trailing - Remove trailing '_' for each name
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+ * segment
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*
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*
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* RETURN: Status, Buffer is filled with pathname if status is AE_OK
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* RETURN: Status, Buffer is filled with pathname if status is AE_OK
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*
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*
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@@ -225,7 +115,7 @@ acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
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acpi_status
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acpi_status
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acpi_ns_handle_to_pathname(acpi_handle target_handle,
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acpi_ns_handle_to_pathname(acpi_handle target_handle,
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- struct acpi_buffer * buffer)
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+ struct acpi_buffer * buffer, u8 no_trailing)
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{
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{
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acpi_status status;
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acpi_status status;
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struct acpi_namespace_node *node;
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struct acpi_namespace_node *node;
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@@ -240,7 +130,8 @@ acpi_ns_handle_to_pathname(acpi_handle target_handle,
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/* Determine size required for the caller buffer */
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/* Determine size required for the caller buffer */
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- required_size = acpi_ns_get_pathname_length(node);
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+ required_size =
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+ acpi_ns_build_normalized_path(node, NULL, 0, no_trailing);
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if (!required_size) {
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if (!required_size) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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}
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@@ -254,8 +145,8 @@ acpi_ns_handle_to_pathname(acpi_handle target_handle,
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/* Build the path in the caller buffer */
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/* Build the path in the caller buffer */
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- status =
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- acpi_ns_build_external_path(node, required_size, buffer->pointer);
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+ (void)acpi_ns_build_normalized_path(node, buffer->pointer,
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+ required_size, no_trailing);
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if (ACPI_FAILURE(status)) {
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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return_ACPI_STATUS(status);
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}
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}
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@@ -264,3 +155,149 @@ acpi_ns_handle_to_pathname(acpi_handle target_handle,
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(char *)buffer->pointer, (u32) required_size));
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(char *)buffer->pointer, (u32) required_size));
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return_ACPI_STATUS(AE_OK);
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return_ACPI_STATUS(AE_OK);
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}
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}
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+
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+/*******************************************************************************
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+ *
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+ * FUNCTION: acpi_ns_build_normalized_path
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+ *
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+ * PARAMETERS: node - Namespace node
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+ * full_path - Where the path name is returned
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+ * path_size - Size of returned path name buffer
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+ * no_trailing - Remove trailing '_' from each name segment
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+ *
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+ * RETURN: Return 1 if the AML path is empty, otherwise returning (length
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+ * of pathname + 1) which means the 'FullPath' contains a trailing
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+ * null.
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+ *
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+ * DESCRIPTION: Build and return a full namespace pathname.
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+ * Note that if the size of 'FullPath' isn't large enough to
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+ * contain the namespace node's path name, the actual required
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+ * buffer length is returned, and it should be greater than
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+ * 'PathSize'. So callers are able to check the returning value
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+ * to determine the buffer size of 'FullPath'.
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+ *
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+ ******************************************************************************/
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+
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+u32
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+acpi_ns_build_normalized_path(struct acpi_namespace_node *node,
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+ char *full_path, u32 path_size, u8 no_trailing)
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+{
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+ u32 length = 0, i;
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+ char name[ACPI_NAME_SIZE];
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+ u8 do_no_trailing;
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+ char c, *left, *right;
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+ struct acpi_namespace_node *next_node;
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+
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+ ACPI_FUNCTION_TRACE_PTR(ns_build_normalized_path, node);
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+
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+#define ACPI_PATH_PUT8(path, size, byte, length) \
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+ do { \
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+ if ((length) < (size)) \
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+ { \
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+ (path)[(length)] = (byte); \
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+ } \
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+ (length)++; \
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+ } while (0)
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+
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+ /*
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+ * Make sure the path_size is correct, so that we don't need to
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+ * validate both full_path and path_size.
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+ */
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+ if (!full_path) {
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+ path_size = 0;
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+ }
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+
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+ if (!node) {
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+ goto build_trailing_null;
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+ }
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+
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+ next_node = node;
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+ while (next_node && next_node != acpi_gbl_root_node) {
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+ if (next_node != node) {
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+ ACPI_PATH_PUT8(full_path, path_size,
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+ AML_DUAL_NAME_PREFIX, length);
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+ }
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+ ACPI_MOVE_32_TO_32(name, &next_node->name);
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+ do_no_trailing = no_trailing;
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+ for (i = 0; i < 4; i++) {
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+ c = name[4 - i - 1];
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+ if (do_no_trailing && c != '_') {
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+ do_no_trailing = FALSE;
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+ }
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+ if (!do_no_trailing) {
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+ ACPI_PATH_PUT8(full_path, path_size, c, length);
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+ }
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+ }
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+ next_node = next_node->parent;
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+ }
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+ ACPI_PATH_PUT8(full_path, path_size, AML_ROOT_PREFIX, length);
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+
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+ /* Reverse the path string */
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+
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+ if (length <= path_size) {
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+ left = full_path;
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+ right = full_path + length - 1;
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+ while (left < right) {
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+ c = *left;
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+ *left++ = *right;
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+ *right-- = c;
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+ }
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+ }
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+
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+ /* Append the trailing null */
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+
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+build_trailing_null:
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+ ACPI_PATH_PUT8(full_path, path_size, '\0', length);
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+
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+#undef ACPI_PATH_PUT8
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+
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+ return_UINT32(length);
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+}
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+
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+/*******************************************************************************
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+ *
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+ * FUNCTION: acpi_ns_get_normalized_pathname
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+ *
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+ * PARAMETERS: node - Namespace node whose pathname is needed
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+ * no_trailing - Remove trailing '_' from each name segment
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+ *
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+ * RETURN: Pointer to storage containing the fully qualified name of
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+ * the node, In external format (name segments separated by path
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+ * separators.)
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+ *
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+ * DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
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+ * for error and debug statements. All trailing '_' will be
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+ * removed from the full pathname if 'NoTrailing' is specified..
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+ *
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+ ******************************************************************************/
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+
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+char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node,
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+ u8 no_trailing)
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+{
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+ char *name_buffer;
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+ acpi_size size;
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+
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+ ACPI_FUNCTION_TRACE_PTR(ns_get_normalized_pathname, node);
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+
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+ /* Calculate required buffer size based on depth below root */
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+
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+ size = acpi_ns_build_normalized_path(node, NULL, 0, no_trailing);
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+ if (!size) {
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+ return_PTR(NULL);
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+ }
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+
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+ /* Allocate a buffer to be returned to caller */
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+
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+ name_buffer = ACPI_ALLOCATE_ZEROED(size);
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+ if (!name_buffer) {
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+ ACPI_ERROR((AE_INFO, "Could not allocate %u bytes", (u32)size));
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+ return_PTR(NULL);
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+ }
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+
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+ /* Build the path in the allocated buffer */
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+
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+ (void)acpi_ns_build_normalized_path(node, name_buffer, size,
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+ no_trailing);
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+
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+ return_PTR(name_buffer);
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+}
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