Re: [PATCH v4 1/3] drm/prime: Pass the right module owner through to dma_buf_export()

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For the series:

Reviewed-by: Petri Latvala <petri.latvala@xxxxxxxxx>

On 10/05/2016 03:21 PM, Chris Wilson wrote:
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@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Petri Latvala <petri.latvala@xxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Petri Latvala <petri.latvala@xxxxxxxxx>
---
  drivers/gpu/drm/drm_prime.c | 17 ++++++++++-------
  include/drm/drmP.h          |  3 ++-
  2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 57201d68cf61..80907b34d857 100644
--- 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 0e99669159c1..81fcd553edf7 100644
--- 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);

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