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New unittests for overlay notifiers reveal a memory leak in
of_overlay_apply() when a notifier returns an error for action
OF_OVERLAY_POST_APPLY. The pr_err() message is:
OF: ERROR: memory leak, expected refcount 1 instead of 3,
of_node_get()/of_node_put() unbalanced - destroy cset entry: attach
overlay node /testcase-data/overlay-node/test-bus/test-unittest17
Change the error path to no longer call free_overlay_changeset(),
and document that the caller of of_overlay_fdt_apply() may choose
to remove the overlay.
Update the unittest that triggered the error to expect the changed
return values and to call of_overlay_remove().
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220502181742.1402826-4-frowand.list@gmail.com
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