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path: root/drivers/acpi/parser/pstree.c
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Diffstat (limited to 'drivers/acpi/parser/pstree.c')
-rw-r--r--drivers/acpi/parser/pstree.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/acpi/parser/pstree.c b/drivers/acpi/parser/pstree.c
index dd6f16726fc4..0015717ef096 100644
--- a/drivers/acpi/parser/pstree.c
+++ b/drivers/acpi/parser/pstree.c
@@ -77,6 +77,7 @@ union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)
op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
if (op_info->class == AML_CLASS_UNKNOWN) {
+
/* Invalid opcode or ASCII character */
return (NULL);
@@ -85,6 +86,7 @@ union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)
/* Check if this opcode requires argument sub-objects */
if (!(op_info->flags & AML_HAS_ARGS)) {
+
/* Has no linked argument objects */
return (NULL);
@@ -130,6 +132,7 @@ acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
if (op_info->class == AML_CLASS_UNKNOWN) {
+
/* Invalid opcode */
ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
@@ -140,6 +143,7 @@ acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
/* Check if this opcode requires argument sub-objects */
if (!(op_info->flags & AML_HAS_ARGS)) {
+
/* Has no linked argument objects */
return;
@@ -148,6 +152,7 @@ acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
/* Append the argument to the linked argument list */
if (op->common.value.arg) {
+
/* Append to existing argument list */
prev_arg = op->common.value.arg;
@@ -222,12 +227,14 @@ union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
}
if (arg == origin) {
+
/* Reached parent of origin, end search */
return (NULL);
}
if (parent->common.next) {
+
/* Found sibling of parent */
return (parent->common.next);
@@ -299,5 +306,4 @@ union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
return (child);
}
#endif
-
#endif /* ACPI_FUTURE_USAGE */