linux-kernel - Re: [PATCH v3 1/4] drm/tests: helpers: Add helper for drm_display_mode_from_cea

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Message-ID: <81fb3a17-4e2d-d21e-71a1-222b85b0ff9b@huawei.com>
Date: Wed, 30 Oct 2024 09:48:31 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: Maxime Ripard <mripard@...nel.org>
CC: <maarten.lankhorst@...ux.intel.com>, <tzimmermann@...e.de>,
	<airlied@...il.com>, <simona@...ll.ch>, <christian.koenig@....com>,
	<ray.huang@....com>, <dmitry.baryshkov@...aro.org>,
	<dave.stevenson@...pberrypi.com>, <quic_jjohnson@...cinc.com>,
	<mcanal@...lia.com>, <davidgow@...gle.com>, <skhan@...uxfoundation.org>,
	<karolina.stolarek@...el.com>, <Arunpravin.PaneerSelvam@....com>,
	<thomas.hellstrom@...ux.intel.com>, <asomalap@....com>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] drm/tests: helpers: Add helper for
 drm_display_mode_from_cea_vic()



On 2024/10/29 16:16, Maxime Ripard wrote:
> On Thu, Oct 17, 2024 at 02:31:22PM +0800, Jinjie Ruan wrote:
>> As Maxime suggested, add a new helper
>> drm_kunit_display_mode_from_cea_vic(), it can replace the direct call
>> of drm_display_mode_from_cea_vic(), and it will help solving
>> the `mode` memory leaks.
>>
>> Acked-by: Maxime Ripard <mripard@...nel.org>
>> Suggested-by: Maxime Ripard <mripard@...nel.org>
>> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
>> ---
>> v3:
>> - Adjust drm/drm_edid.h header to drm_kunit_helpers.c.
>> - Drop the "helper" in the helper name.
>> - Add Acked-by.
>> ---
>>  drivers/gpu/drm/tests/drm_kunit_helpers.c | 40 +++++++++++++++++++++++
>>  include/drm/drm_kunit_helpers.h           |  4 +++
>>  2 files changed, 44 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
>> index aa62719dab0e..565172990044 100644
>> --- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
>> +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
>> @@ -3,6 +3,7 @@
>>  #include <drm/drm_atomic.h>
>>  #include <drm/drm_atomic_helper.h>
>>  #include <drm/drm_drv.h>
>> +#include <drm/drm_edid.h>
>>  #include <drm/drm_fourcc.h>
>>  #include <drm/drm_kunit_helpers.h>
>>  #include <drm/drm_managed.h>
>> @@ -311,6 +312,45 @@ drm_kunit_helper_create_crtc(struct kunit *test,
>>  }
>>  EXPORT_SYMBOL_GPL(drm_kunit_helper_create_crtc);
>>  
>> +static void kunit_action_drm_mode_destroy(void *ptr)
>> +{
>> +	struct drm_display_mode *mode = ptr;
>> +
>> +	drm_mode_destroy(NULL, mode);
>> +}
>> +
>> +/**
>> + * drm_kunit_display_mode_from_cea_vic() - return a mode for CEA VIC
>> +					   for a KUnit test
>> + * @test: The test context object
>> + * @dev: DRM device
>> + * @video_code: CEA VIC of the mode
>> + *
>> + * Creates a new mode matching the specified CEA VIC for a KUnit test.
>> + *
>> + * Resources will be cleaned up automatically.
>> + *
>> + * Returns: A new drm_display_mode on success or NULL on failure
>> + */
>> +struct drm_display_mode *
>> +drm_kunit_display_mode_from_cea_vic(struct kunit *test, struct drm_device *dev,
>> +				    u8 video_code)
>> +{
>> +	struct drm_display_mode *mode;
>> +	int ret;
>> +
>> +	mode = drm_display_mode_from_cea_vic(dev, video_code);
> 
> I'd rather return directly if mode is NULL here...
> 
>> +	ret = kunit_add_action_or_reset(test,
>> +					kunit_action_drm_mode_destroy,
>> +					mode);
>> +	if (ret)
>> +		return NULL;
> 
> Because it doesn't really make much sense to register a cleanup action
> if we know that it's going to be useless, and possibly be executed right
> away.

Sure, will udpate it.

> 
> Maxime