linux-kernel - Re: [PATCH drm-dp 01/10] drm/hisilicon/hibmc: fix the i2c device resource leak when vdac init failed

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Message-ID: <d457dfc4-9331-4b01-89fa-8bdd1d051ff6@huawei.com>
Date: Mon, 9 Jun 2025 22:45:43 +0800
From: Yongbang Shi <shiyongbang@...wei.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
CC: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<kong.kongxinwei@...ilicon.com>, <liangjian010@...wei.com>,
	<chenjianmin@...wei.com>, <lidongming5@...wei.com>, <libaihan@...wei.com>,
	<shenjian15@...wei.com>, <shaojijie@...wei.com>,
	<jani.nikula@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH drm-dp 01/10] drm/hisilicon/hibmc: fix the i2c device
 resource leak when vdac init failed


> On Fri, May 30, 2025 at 05:54:23PM +0800, Yongbang Shi wrote:
>> From: Baihan Li <libaihan@...wei.com>
>>
>> Currently the driver missed to clean the i2c adapter when vdac init failed.
>> It may cause resource leak.
>>
>> Fixes: 94ee73ee3020 ("drm/hisilicon/hibmc: add dp hw moduel in hibmc driver")
> No, the tag is incorrect. Offending code was added in a different commit.
>
>> Signed-off-by: Baihan Li <libaihan@...wei.com>
>> ---
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h  | 1 +
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c  | 5 +++++
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 9 +++++++--
>>   3 files changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
>> index 274feabe7df0..ca8502e2760c 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
>> @@ -69,6 +69,7 @@ int hibmc_de_init(struct hibmc_drm_private *priv);
>>   int hibmc_vdac_init(struct hibmc_drm_private *priv);
>>   
>>   int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_vdac *connector);
>> +void hibmc_ddc_del(struct hibmc_vdac *vdac);
>>   
>>   int hibmc_dp_init(struct hibmc_drm_private *priv);
>>   
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c
>> index 99b3b77b5445..44860011855e 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c
>> @@ -95,3 +95,8 @@ int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_vdac *vdac)
>>   
>>   	return i2c_bit_add_bus(&vdac->adapter);
>>   }
>> +
>> +void hibmc_ddc_del(struct hibmc_vdac *vdac)
>> +{
>> +	i2c_del_adapter(&vdac->adapter);
>> +}
> Then hibmc_connector_destroy() also needs to use this helper.
>
Thanks for correcting, I'll fix them.
Baihan.


>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>> index e8a527ede854..36401b46034c 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>> @@ -110,7 +110,7 @@ int hibmc_vdac_init(struct hibmc_drm_private *priv)
>>   	ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_DAC, NULL);
>>   	if (ret) {
>>   		drm_err(dev, "failed to init encoder: %d\n", ret);
>> -		return ret;
>> +		goto err;
>>   	}
>>   
>>   	drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
>> @@ -121,7 +121,7 @@ int hibmc_vdac_init(struct hibmc_drm_private *priv)
>>   					  &vdac->adapter);
>>   	if (ret) {
>>   		drm_err(dev, "failed to init connector: %d\n", ret);
>> -		return ret;
>> +		goto err;
>>   	}
>>   
>>   	drm_connector_helper_add(connector, &hibmc_connector_helper_funcs);
>> @@ -131,4 +131,9 @@ int hibmc_vdac_init(struct hibmc_drm_private *priv)
>>   	connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
>>   
>>   	return 0;
>> +
>> +err:
>> +	hibmc_ddc_del(vdac);
>> +
>> +	return ret;
>>   }
>> -- 
>> 2.33.0
>>