drm/nouveau: Fix ordering between TTM and GEM release

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When the last reference to a TTM BO is dropped, ttm_bo_release() will
acquire the DMA reservation object's wound/wait mutex while trying to
clean up (ttm_bo_cleanup_refs_or_queue() via ttm_bo_release()). It is
therefore essential that drm_gem_object_release() be called after the
TTM BO has been uninitialized, otherwise drm_gem_object_release() has
already destroyed the wound/wait mutex (via dma_resv_fini()).

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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Thierry Reding 2019-09-16 16:19:25 +02:00 • committed by Ben Skeggs

parent 0bb21c9677

commit 641f53c07d

2 changed files with 8 additions and 6 deletions

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10

drivers/gpu/drm/nouveau/nouveau_bo.c

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4

drivers/gpu/drm/nouveau/nouveau_gem.c

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