drm/amdgpu: set f_mapping on exported DMA-bufs

Otherwise we can't correctly CPU map TTM buffers.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
index 90af8e82b16a..ae9c106979d7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
@@ -169,10 +169,14 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
                                         int flags)
 {
         struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
+        struct dma_buf *buf;
 
         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
             bo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
                 return ERR_PTR(-EPERM);
 
-        return drm_gem_prime_export(dev, gobj, flags);
+        buf = drm_gem_prime_export(dev, gobj, flags);
+        if (!IS_ERR(buf))
+                buf->file->f_mapping = dev->anon_inode->i_mapping;
+        return buf;
 }