ACPI: tables: Simplify PPTT leaf node detection

ACPI 6.3 bumps the PPTT table revision and adds a LEAF_NODE flag.

This allows us to avoid a second pass through the table to assure
that the node in question is a leaf.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index ad31c50de3be..065c4fc245d1 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -209,6 +209,9 @@ static int acpi_pptt_leaf_node(struct acpi_table_header *table_hdr,
         struct acpi_pptt_processor *cpu_node;
         u32 proc_sz;
 
+        if (table_hdr->revision > 1)
+                return (node->flags & ACPI_PPTT_ACPI_LEAF_NODE);
+
         table_end = (unsigned long)table_hdr + table_hdr->length;
         node_entry = ACPI_PTR_DIFF(node, table_hdr);
         entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,