linux-hardening - Re: [PATCH v4 5/5] drm/tests: Switch to kunit devices

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Date: Fri, 15 Dec 2023 17:48:18 -0500
From: Rae Moar <rmoar@...gle.com>
To: davidgow@...gle.com
Cc: Brendan Higgins <brendan.higgins@...ux.dev>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Matti Vaittinen <mazziesaccount@...il.com>, 
	Stephen Boyd <sboyd@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>, 
	Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, Maxime Ripard <mripard@...nel.org>, 
	linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH v4 5/5] drm/tests: Switch to kunit devices

On Fri, Dec 15, 2023 at 2:39 AM <davidgow@...gle.com> wrote:
>
> From: Maxime Ripard <mripard@...nel.org>
>
> Kunit recently gained helpers to create test managed devices. This means
> that we no longer have to roll our own helpers in KMS and we can reuse
> them.

Hello!

This looks good to me. Thanks!

Reviewed-by: Rae Moar <rmoar@...gle.com>

-Rae

>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> Tested-by: David Gow <davidgow@...gle.com>
> Signed-off-by: David Gow <davidgow@...gle.com>
> ---
>  drivers/gpu/drm/tests/drm_kunit_helpers.c | 66 ++-----------------------------
>  1 file changed, 3 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> index c251e6b34de0..ca4f8e4c5d5d 100644
> --- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
> +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> @@ -5,6 +5,7 @@
>  #include <drm/drm_kunit_helpers.h>
>  #include <drm/drm_managed.h>
>
> +#include <kunit/device.h>
>  #include <kunit/resource.h>
>
>  #include <linux/device.h>
> @@ -15,28 +16,6 @@
>  static const struct drm_mode_config_funcs drm_mode_config_funcs = {
>  };
>
> -static int fake_probe(struct platform_device *pdev)
> -{
> -       return 0;
> -}
> -
> -static struct platform_driver fake_platform_driver = {
> -       .probe  = fake_probe,
> -       .driver = {
> -               .name   = KUNIT_DEVICE_NAME,
> -       },
> -};
> -
> -KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_driver_unregister,
> -                           platform_driver_unregister,
> -                           struct platform_driver *);
> -KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_put,
> -                           platform_device_put,
> -                           struct platform_device *);
> -KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_del,
> -                           platform_device_del,
> -                           struct platform_device *);
> -
>  /**
>   * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
>   * @test: The test context object
> @@ -54,34 +33,7 @@ KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_del,
>   */
>  struct device *drm_kunit_helper_alloc_device(struct kunit *test)
>  {
> -       struct platform_device *pdev;
> -       int ret;
> -
> -       ret = platform_driver_register(&fake_platform_driver);
> -       KUNIT_ASSERT_EQ(test, ret, 0);
> -
> -       ret = kunit_add_action_or_reset(test,
> -                                       kunit_action_platform_driver_unregister,
> -                                       &fake_platform_driver);
> -       KUNIT_ASSERT_EQ(test, ret, 0);
> -
> -       pdev = platform_device_alloc(KUNIT_DEVICE_NAME, PLATFORM_DEVID_NONE);
> -       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
> -
> -       ret = kunit_add_action_or_reset(test,
> -                                       kunit_action_platform_device_put,
> -                                       pdev);
> -       KUNIT_ASSERT_EQ(test, ret, 0);
> -
> -       ret = platform_device_add(pdev);
> -       KUNIT_ASSERT_EQ(test, ret, 0);
> -
> -       ret = kunit_add_action_or_reset(test,
> -                                       kunit_action_platform_device_del,
> -                                       pdev);
> -       KUNIT_ASSERT_EQ(test, ret, 0);
> -
> -       return &pdev->dev;
> +       return kunit_device_register(test, KUNIT_DEVICE_NAME);
>  }
>  EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
>
> @@ -94,19 +46,7 @@ EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
>   */
>  void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
>  {
> -       struct platform_device *pdev = to_platform_device(dev);
> -
> -       kunit_release_action(test,
> -                            kunit_action_platform_device_del,
> -                            pdev);
> -
> -       kunit_release_action(test,
> -                            kunit_action_platform_device_put,
> -                            pdev);
> -
> -       kunit_release_action(test,
> -                            kunit_action_platform_driver_unregister,
> -                            &fake_platform_driver);
> +       kunit_device_unregister(test, dev);
>  }
>  EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);
>
>
> --
> 2.43.0.472.g3155946c3a-goog
>