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

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Date:   Fri, 18 Nov 2022 18:32:32 +0800
From:   Chunyou Tang <tangchunyou@....com>
To:     Thomas Zimmermann <tzimmermann@...e.de>
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 Thomas,
   Can I discard the first two patchs, and pull the new code, then
   modify and git send-email this patch?


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,
>