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drm: prime: fix refcounting on the dmabuf import error path

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In commit be8a42ae60 we inroduced a refcount problem, where on the
drm_gem_prime_fd_to_handle() error path we'll call dma_buf_put() for
self imported dma buffers.

Fix this by taking a reference on the dma buffer in the .gem_import
hook instead of assuming the caller had taken one. Besides fixing the
bug this is also more logical.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Imre Deak 2013-04-19 11:11:56 +10:00 committed by Dave Airlie
parent 219b47339c
commit 011c2282c7
5 changed files with 18 additions and 4 deletions
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8
drivers/gpu/drm/drm_prime.c
View file

@ -271,7 +271,6 @@ struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
dma_buf_put(dma_buf);
return obj;
}
}
@ -280,6 +279,8 @@ struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
if (IS_ERR(attach))
return ERR_PTR(PTR_ERR(attach));
get_dma_buf(dma_buf);
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR_OR_NULL(sgt)) {
ret = PTR_ERR(sgt);
@ -300,6 +301,8 @@ fail_unmap:
dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
fail_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(drm_gem_prime_import);
@ -342,6 +345,9 @@ int drm_gem_prime_fd_to_handle(struct drm_device *dev,
goto fail;
mutex_unlock(&file_priv->prime.lock);
dma_buf_put(dma_buf);
return 0;
fail:

4
drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
View file

@ -235,7 +235,6 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
dma_buf_put(dma_buf);
return obj;
}
}
@ -244,6 +243,7 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
if (IS_ERR(attach))
return ERR_PTR(-EINVAL);
get_dma_buf(dma_buf);
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR_OR_NULL(sgt)) {
@ -298,6 +298,8 @@ err_unmap_attach:
dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
err_buf_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}

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

@ -272,7 +272,6 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(&obj->base);
dma_buf_put(dma_buf);
return &obj->base;
}
}
@ -282,6 +281,8 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
if (IS_ERR(attach))
return ERR_CAST(attach);
get_dma_buf(dma_buf);
obj = i915_gem_object_alloc(dev);
if (obj == NULL) {
ret = -ENOMEM;
@ -301,5 +302,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
fail_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}

1
drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
View file

@ -212,7 +212,6 @@ struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
dma_buf_put(buffer);
return obj;
}
}

4
drivers/gpu/drm/udl/udl_gem.c
View file

@ -303,6 +303,8 @@ struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
if (IS_ERR(attach))
return ERR_CAST(attach);
get_dma_buf(dma_buf);
sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR(sg)) {
ret = PTR_ERR(sg);
@ -322,5 +324,7 @@ fail_unmap:
dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
fail_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}