of/unittest: Fix of_platform_depopulate test case

The previous commit, "of/unittest: early return from test skips tests"
exposed broken tests for the of_platform_unpopulate() function. The
problem was the populate and depopulate calls were not symmetrical like
they were intended to be, and unpopulate depends on the parent device to
have it's of_node pointer pointing to the parent device node. Fix these
bugs so that the test case works correctly.

In the process, the test_bus used as a container for the test devices
has been changed from a statically allocated struct device (which is
bad) to a properly allocated device with a .release() method (which is
good). This stops the test code from being a bad example of abusing the
device model.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Cc: Frank Rowand <frank.rowand@sonymobile.com>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Cc: Pawel Moll <pawel.moll@arm.com>

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 3b15577..a4f90c2 100644 (file)
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -751,14 +751,14 @@ static void __init of_selftest_match_node(void)
        }
 }
 
-struct device test_bus = {
-       .init_name = "unittest-bus",
+static const struct platform_device_info test_bus_info = {
+       .name = "unittest-bus",
 };
 static void __init of_selftest_platform_populate(void)
 {
        int irq, rc;
        struct device_node *np, *child, *grandchild;
-       struct platform_device *pdev;
+       struct platform_device *pdev, *test_bus;
        const struct of_device_id match[] = {
                { .compatible = "test-device", },
                {}
@@ -787,20 +787,22 @@ static void __init of_selftest_platform_populate(void)
        if (!np)
                return;
 
-       rc = device_register(&test_bus);
+       test_bus = platform_device_register_full(&test_bus_info);
+       rc = PTR_ERR_OR_ZERO(test_bus);
        selftest(!rc, "testbus registration failed; rc=%i\n", rc);
        if (rc)
                return;
+       test_bus->dev.of_node = np;
 
+       of_platform_populate(np, match, NULL, &test_bus->dev);
        for_each_child_of_node(np, child) {
-               of_platform_populate(child, match, NULL, &test_bus);
                for_each_child_of_node(child, grandchild)
                        selftest(of_find_device_by_node(grandchild),
                                 "Could not create device for node '%s'\n",
                                 grandchild->name);
        }
 
-       of_platform_depopulate(&test_bus);
+       of_platform_depopulate(&test_bus->dev);
        for_each_child_of_node(np, child) {
                for_each_child_of_node(child, grandchild)
                        selftest(!of_find_device_by_node(grandchild),
@@ -808,7 +810,7 @@ static void __init of_selftest_platform_populate(void)
                                 grandchild->name);
        }
 
-       device_unregister(&test_bus);
+       platform_device_unregister(test_bus);
        of_node_put(np);
 }