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drm/prime: Pass the right module owner through to dma_buf_export()

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dma_buf_export() adds a reference to the owning module to the dmabuf (to
prevent the driver from being unloaded whilst a third party still refers
to the dmabuf). However, drm_gem_prime_export() was passing its own
THIS_MODULE (i.e. drm.ko) rather than the driver. Extract the right
owner from the device->fops instead.

v2: Use C99 initializers to zero out unset elements of
dma_buf_export_info
v3: Extract the right module from dev->fops.

Testcase: igt/vgem_basic/unload
Reported-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org
Tested-by: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161005122145.1507-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-10-05 13:21:43 +01:00 committed by Daniel Vetter
parent bf3b123e3d
commit 56a76c0123
2 changed files with 12 additions and 8 deletions
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17
drivers/gpu/drm/drm_prime.c
View File

@ -397,14 +397,17 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
* using the PRIME helpers.
*/
struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags)
struct drm_gem_object *obj,
int flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
exp_info.ops = &drm_gem_prime_dmabuf_ops;
exp_info.size = obj->size;
exp_info.flags = flags;
exp_info.priv = obj;
struct dma_buf_export_info exp_info = {
.exp_name = KBUILD_MODNAME, /* white lie for debug */
.owner = dev->driver->fops->owner,
.ops = &drm_gem_prime_dmabuf_ops,
.size = obj->size,
.flags = flags,
.priv = obj,
};
if (dev->driver->gem_prime_res_obj)
exp_info.resv = dev->driver->gem_prime_res_obj(obj);

3
include/drm/drmP.h
View File

@ -1012,7 +1012,8 @@ static inline int drm_debugfs_remove_files(const struct drm_info_list *files,
#endif
extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags);
struct drm_gem_object *obj,
int flags);
extern int drm_gem_prime_handle_to_fd(struct drm_device *dev,
struct drm_file *file_priv, uint32_t handle, uint32_t flags,
int *prime_fd);