[PATCH 2/2] drm/amdgpu: 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 <tzimmerm...@suse.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c     | 3 +--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c      | 2 +-
 3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index dc5ad1840b2c..8b0559c2e87f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -471,7 +471,7 @@ bool amdgpu_dmabuf_is_xgmi_accessible(struct amdgpu_device 
*adev,
        struct drm_gem_object *gobj;
 
        if (drm_gem_is_imported(obj)) {
-               struct dma_buf *dma_buf = obj->import_attach->dmabuf;
+               struct dma_buf *dma_buf = obj->dma_buf;
 
                if (dma_buf->ops != &amdgpu_dmabuf_ops)
                        /* No XGMI with non AMD GPUs */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 573bb5e4ba08..9d24f819590b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -199,8 +199,7 @@ static int amdgpu_gem_object_open(struct drm_gem_object 
*obj,
         */
        if (!vm->is_compute_context || !vm->process_info)
                return 0;
-       if (!drm_gem_is_imported(obj) ||
-           !dma_buf_is_dynamic(obj->import_attach->dmabuf))
+       if (!drm_gem_is_imported(obj) || !dma_buf_is_dynamic(obj->dma_buf))
                return 0;
        mutex_lock_nested(&vm->process_info->lock, 1);
        if (!WARN_ON(!vm->process_info->eviction_fence)) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index d1eb3dfd2c63..13e5948b008e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1271,7 +1271,7 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev, 
struct amdgpu_bo_va *bo_va,
                struct drm_gem_object *obj = &bo->tbo.base;
 
                if (drm_gem_is_imported(obj) && bo_va->is_xgmi) {
-                       struct dma_buf *dma_buf = obj->import_attach->dmabuf;
+                       struct dma_buf *dma_buf = obj->dma_buf;
                        struct drm_gem_object *gobj = dma_buf->priv;
                        struct amdgpu_bo *abo = gem_to_amdgpu_bo(gobj);
 
-- 
2.49.0