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

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

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 57201d68cf61bdabf5bbe4e7cd5275bef733d614..80907b34d857b863ff92a7ba1ab27087cf4af08f 100644 (file)
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -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);

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 0e99669159c11d92f7d9b0652e9ffdb5b70a5858..81fcd553edf74bf7a2b449870ef6fb4baa14fb12 100644 (file)
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -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);