of: unittest: kmemleak in of_unittest_platform_populate()

[ Upstream commit 216830d2413cc61be3f76bc02ffd905e47d2439e ]

kmemleak reports several memory leaks from devicetree unittest.
This is the fix for problem 2 of 5.

of_unittest_platform_populate() left an elevated reference count for
grandchild nodes (which are platform devices).  Fix the platform
device reference counts so that the memory will be freed.

Fixes: fb2caa50fbac ("of/selftest: add testcase for nodes with same name and address")
Reported-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index af9e4785b7a6eca1030fb231cf5145af174041f1..91e6891b777b6d48636807eca949fad29f1ebb1c 100644 (file)
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -812,10 +812,13 @@ static void __init of_unittest_platform_populate(void)
 
        of_platform_populate(np, match, NULL, &test_bus->dev);
        for_each_child_of_node(np, child) {
-               for_each_child_of_node(child, grandchild)
-                       unittest(of_find_device_by_node(grandchild),
+               for_each_child_of_node(child, grandchild) {
+                       pdev = of_find_device_by_node(grandchild);
+                       unittest(pdev,
                                 "Could not create device for node '%s'\n",
                                 grandchild->name);
+                       of_dev_put(pdev);
+               }
        }
 
        of_platform_depopulate(&test_bus->dev);