dtc: Wrap phandle validity check

In several places we check for a returned phandle value to be valid,
for that it must not be 0 or "-1".

Wrap this check in a static inline function in dtc.h, and use ~0U instead
of -1 on the way, to keep everything in the unsigned realm.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Message-Id: <20210618172030.9684-4-andre.przywara@arm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/livetree.c b/livetree.c
index dfbae65..cc61237 100644
--- a/livetree.c
+++ b/livetree.c
@@ -559,7 +559,7 @@ struct node *get_node_by_phandle(struct node *tree, cell_t phandle)
 {
 	struct node *child, *node;
 
-	if ((phandle == 0) || (phandle == -1)) {
+	if (!phandle_is_valid(phandle)) {
 		assert(generate_fixups);
 		return NULL;
 	}
@@ -594,7 +594,7 @@ cell_t get_node_phandle(struct node *root, struct node *node)
 	static cell_t phandle = 1; /* FIXME: ick, static local */
 	struct data d = empty_data;
 
-	if ((node->phandle != 0) && (node->phandle != -1))
+	if (phandle_is_valid(node->phandle))
 		return node->phandle;
 
 	while (get_node_by_phandle(root, phandle))