drm/bochs: fix bochs_gem_prime_mmap
ttm_fbdev_mmap() just doesn't work. It appears to work fine, mmap() returns success, but any attempt to actually access the mapping causes a SIGBUS. We can just use drm_gem_prime_mmap() instead. Almost. We have to copy over the start offset from the ttm_buffer_object vm_node to the drm_gem_object vm_node so the offset math in drm_gem_prime_mmap() works correctly for us even though we use ttm to manage our objects. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20190204183858.8976-1-kraxel@redhat.com
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@ -442,5 +442,6 @@ int bochs_gem_prime_mmap(struct drm_gem_object *obj,
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{
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struct bochs_bo *bo = gem_to_bochs_bo(obj);
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return ttm_fbdev_mmap(vma, &bo->bo);
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bo->gem.vma_node.vm_node.start = bo->bo.vma_node.vm_node.start;
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return drm_gem_prime_mmap(obj, vma);
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}
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