linux-kernel - Re: [PATCH v2] drm/gem-shmem: When drm_gem_object

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Date:   Fri, 18 Nov 2022 12:21:33 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Chunyou Tang <tangchunyou@....com>
Cc:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        airlied@...il.com, daniel@...ll.ch, sumit.semwal@...aro.org,
        christian.koenig@....com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v2] drm/gem-shmem: When drm_gem_object_init failed, should
 release object

Hi

Am 18.11.22 um 11:32 schrieb Chunyou Tang:
> Hi Thomas,
>     Can I discard the first two patchs, and pull the new code, then
>     modify and git send-email this patch?

Yes, of course. Just make sure that the next version is marked as v3, so 
it's obvious what it belongs to.

Best regards
Thomas

> 
> 
> 于 Thu, 17 Nov 2022 14:42:36 +0100
> Thomas Zimmermann <tzimmermann@...e.de> 写道:
> 
>> Hi
>>
>> Am 11.11.22 um 04:38 schrieb ChunyouTang:
>>> when goto err_free, the object had init, so it should be release
>>> when fail.
>>>
>>> Signed-off-by: ChunyouTang <tangchunyou@....com>
>>> ---
>>>    drivers/gpu/drm/drm_gem.c              | 19 ++++++++++++++++---
>>>    drivers/gpu/drm/drm_gem_shmem_helper.c |  4 +++-
>>>    include/drm/drm_gem.h                  |  1 +
>>>    3 files changed, 20 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
>>> index 8b68a3c1e6ab..cba32c46bb05 100644
>>> --- a/drivers/gpu/drm/drm_gem.c
>>> +++ b/drivers/gpu/drm/drm_gem.c
>>> @@ -169,6 +169,21 @@ void drm_gem_private_object_init(struct
>>> drm_device *dev, }
>>>    EXPORT_SYMBOL(drm_gem_private_object_init);
>>>    
>>> +/**
>>> + * drm_gem_private_object_fini - Finalize a failed drm_gem_object
>>> + * @obj: drm_gem_object
>>> + *
>>> + * Uninitialize an already allocated GEM object when it
>>> initialized failed
>>> + */
>>> +void drm_gem_private_object_fini(struct drm_gem_object *obj)
>>> +{
>>> +	WARN_ON(obj->dma_buf);
>>
>> Rather lease this in its original place.
>>
>>> +
>>> +	dma_resv_fini(&obj->_resv);
>>> +	drm_gem_lru_remove(obj);
>>
>> AFAICT drm_gem_lru_remove() doesn't belong into this function.
>>
>>> +}
>>> +EXPORT_SYMBOL(drm_gem_private_object_fini);
>>> +
>>>    /**
>>>     * drm_gem_object_handle_free - release resources bound to
>>> userspace handles
>>>     * @obj: GEM object to clean up.
>>> @@ -930,14 +945,12 @@ drm_gem_release(struct drm_device *dev,
>>> struct drm_file *file_private) void
>>>    drm_gem_object_release(struct drm_gem_object *obj)
>>>    {
>>> -	WARN_ON(obj->dma_buf);
>>> +	drm_gem_private_object_fini(obj);
>>>    
>>>    	if (obj->filp)
>>>    		fput(obj->filp);
>>>    
>>> -	dma_resv_fini(&obj->_resv);
>>
>> Please call drm_gem_private_object_fini() here.
>>
>>>    	drm_gem_free_mmap_offset(obj);
>>> -	drm_gem_lru_remove(obj);
>>
>> Please keep this line here.
>>
>> Best regards
>> Thomas
>>
>>>    }
>>>    EXPORT_SYMBOL(drm_gem_object_release);
>>>    
>>> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c
>>> b/drivers/gpu/drm/drm_gem_shmem_helper.c index
>>> 35138f8a375c..845e3d5d71eb 100644 ---
>>> a/drivers/gpu/drm/drm_gem_shmem_helper.c +++
>>> b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -79,8 +79,10 @@
>>> __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool
>>> private) } else { ret = drm_gem_object_init(dev, obj, size);
>>>    	}
>>> -	if (ret)
>>> +	if (ret) {
>>> +		drm_gem_private_object_fini(obj)
>>>    		goto err_free;
>>> +	}
>>>    
>>>    	ret = drm_gem_create_mmap_offset(obj);
>>>    	if (ret)
>>> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
>>> index bd42f25e449c..9b1feb03069d 100644
>>> --- a/include/drm/drm_gem.h
>>> +++ b/include/drm/drm_gem.h
>>> @@ -405,6 +405,7 @@ int drm_gem_object_init(struct drm_device *dev,
>>>    			struct drm_gem_object *obj, size_t size);
>>>    void drm_gem_private_object_init(struct drm_device *dev,
>>>    				 struct drm_gem_object *obj,
>>> size_t size); +void drm_gem_private_object_fini(struct
>>> drm_gem_object *obj); void drm_gem_vm_open(struct vm_area_struct
>>> *vma); void drm_gem_vm_close(struct vm_area_struct *vma);
>>>    int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long
>>> obj_size,
>>
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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