From: Frank Rowand <frank.rowand@xxxxxxxx>
The test of whether it is safe to remove an overlay changeset
looked at whether any node in the overlay changeset was in a
subtree rooted at any more recently applied overlay changeset
node.
The test failed to determine whether any node in the overlay
changeset was the root of a subtree that contained a more
recently applied overlay changeset node. Add this additional
check to the test.
The test is still lacking any check for any phandle dependencies.
Signed-off-by: Frank Rowand <frank.rowand@xxxxxxxx>
---
drivers/of/overlay.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index c7526186b1c8..015d8b112f60 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -698,13 +698,13 @@ static int find_node(struct device_node *tree, struct device_node *np)
}
/*
- * Is @remove_ce_np a child of or the same as any
+ * Is @remove_ce_node a child of, a parent of, or the same as any
* node in an overlay changeset more topmost than @remove_ovcs?
*
* Returns 1 if found, else 0
*/
-static int node_in_later_cs(struct overlay_changeset *remove_ovcs,
- struct device_node *remove_ce_np)
+static int node_overlaps_later_cs(struct overlay_changeset *remove_ovcs,
+ struct device_node *remove_ce_node)
{
struct overlay_changeset *ovcs;
struct of_changeset_entry *ce;
@@ -714,10 +714,16 @@ static int node_in_later_cs(struct overlay_changeset *remove_ovcs,
break;
list_for_each_entry(ce, &ovcs->cset.entries, node) {
- if (find_node(ce->np, remove_ce_np)) {
- pr_err("%s: #%d clashes #%d @%pOF\n",
+ if (find_node(ce->np, remove_ce_node)) {
+ pr_err("%s: #%d overlaps with #%d @%pOF\n",
__func__, remove_ovcs->id, ovcs->id,
- remove_ce_np);
+ remove_ce_node);
+ return 1;
+ }
+ if (find_node(remove_ce_node, ce->np)) {
+ pr_err("%s: #%d overlaps with #%d @%pOF\n",
+ __func__, remove_ovcs->id, ovcs->id,
+ remove_ce_node);
return 1;
}
}
@@ -741,7 +747,7 @@ static int overlay_removal_is_ok(struct overlay_changeset *remove_ovcs)
struct of_changeset_entry *remove_ce;
list_for_each_entry(remove_ce, &remove_ovcs->cset.entries, node) {
- if (node_in_later_cs(remove_ovcs, remove_ce->np)) {
+ if (node_overlaps_later_cs(remove_ovcs, remove_ce->np)) {
pr_err("overlay #%d is not topmost\n", remove_ovcs->id);
return 0;
}
--
Frank Rowand <frank.rowand@xxxxxxxx>
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