[PATCH 0/2] drm/tegra: Avoid struct drm_gem_object.import_attach

[PATCH 0/2] drm/tegra: Avoid struct drm_gem_object.import_attach

[Thomas Zimmermann]

Avoid the use of struct drm_gem_object.import_attach to get the
object's dma-buf or test for an imported buffer. The import_attach
field in struct drm_gem_object is an artifact of the import process,
but should not be used otherwise.

The helper drm_gem_is_imported() tests if a GEM object's buffer
has been imported into the driver. The corresponding dma-buf is
referenced by the object itself. Both cases avoid import_attach.

Thomas Zimmermann (2):
  drm/tegra: Test for imported buffers with drm_gem_is_imported()
  drm/tegra: Use dma_buf from GEM object instance

 drivers/gpu/drm/tegra/gem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.49.0

[PATCH 1/2] drm/tegra: Test for imported buffers with drm_gem_is_imported()

[Thomas Zimmermann]

Instead of testing import_attach for imported GEM buffers, invoke
drm_gem_is_imported() to do the test. The helper tests the dma_buf
itself while import_attach is just an artifact of the import. Prepares
to make import_attach optional.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/tegra/gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index ace3e5a805cf..c1695caec956 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -524,7 +524,7 @@ void tegra_bo_free_object(struct drm_gem_object *gem)
 	if (tegra->domain) {
 		tegra_bo_iommu_unmap(tegra, bo);
 
-		if (gem->import_attach) {
+		if (drm_gem_is_imported(gem)) {
 			dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
 							  DMA_TO_DEVICE);
 			dma_buf_detach(gem->import_attach->dmabuf, gem->import_attach);
-- 
2.49.0

[PATCH 2/2] drm/tegra: Use dma_buf from GEM object instance

[Thomas Zimmermann]

Avoid dereferencing struct drm_gem_object.import_attach for the
imported dma-buf. The dma_buf field in the GEM object instance refers
to the same buffer. Prepares to make import_attach optional.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/tegra/gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index c1695caec956..e17abe63c723 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -527,7 +527,7 @@ void tegra_bo_free_object(struct drm_gem_object *gem)
 		if (drm_gem_is_imported(gem)) {
 			dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
 							  DMA_TO_DEVICE);
-			dma_buf_detach(gem->import_attach->dmabuf, gem->import_attach);
+			dma_buf_detach(gem->dma_buf, gem->import_attach);
 		}
 	}
 
-- 
2.49.0