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drm/prime: drop reference on imported dma-buf come from gem 

Increasing ref counts of both dma-buf and gem for imported dma-buf come from gem
makes memory leak. release function of dma-buf cannot be called because f_count
of dma-buf increased by importing gem and gem ref count cannot be decrease
because of exported dma-buf.

So I add dma_buf_put() for imported gem come from its own gem into each drivers
having prime_import and prime_export capabilities. With this, only gem ref
count is increased if importing gem exported from gem of same driver.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin.park <kyungmin.park@samsung.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <rob.clark@linaro.org>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Seung-Woo Kim 2012-09-27 15:30:06 +09:00 committed by Dave Airlie
parent f3215be950
commit be8a42ae60
5 changed files with 17 additions and 0 deletions
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5
drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
View File

@ -232,7 +232,12 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
/* is it from our device? */
if (obj->dev == drm_dev) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
dma_buf_put(dma_buf);
return obj;
}
}

5
drivers/gpu/drm/i915/i915_gem_dmabuf.c
View File

@ -266,7 +266,12 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
obj = dma_buf->priv;
/* is it from our device? */
if (obj->base.dev == dev) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(&obj->base);
dma_buf_put(dma_buf);
return &obj->base;
}
}

1
drivers/gpu/drm/nouveau/nouveau_prime.c
View File

@ -193,6 +193,7 @@ struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
if (nvbo->gem) {
if (nvbo->gem->dev == dev) {
drm_gem_object_reference(nvbo->gem);
dma_buf_put(dma_buf);
return nvbo->gem;
}
}

1
drivers/gpu/drm/radeon/radeon_prime.c
View File

@ -194,6 +194,7 @@ struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev,
bo = dma_buf->priv;
if (bo->gem_base.dev == dev) {
drm_gem_object_reference(&bo->gem_base);
dma_buf_put(dma_buf);
return &bo->gem_base;
}
}

5
drivers/staging/omapdrm/omap_gem_dmabuf.c
View File

@ -207,7 +207,12 @@ struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
obj = buffer->priv;
/* is it from our device? */
if (obj->dev == dev) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
dma_buf_put(buffer);
return obj;
}
}