Commit 7e0180e3 authored Nov 06, 2014 by Thierry Reding

drm/tegra: gem: Check before freeing CMA memory



dma_free_writecombine() must not be called on a buffer that couldn't be
allocated. Check for a valid virtual address before attempting to free
the memory to avoid a crash.

Reported-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

parent cb10c81f

drivers/gpu/drm/tegra/gem.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -210,7 +210,7 @@ static void tegra_bo_free(struct drm_device drm, struct tegra_bo bo)
		drm_gem_put_pages(&bo->gem, bo->pages, true, true);
		sg_free_table(bo->sgt);
		kfree(bo->sgt);
		} else {
		} else if (bo->vaddr) {
		dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr,
		bo->paddr);
		}