The GEM CMA helpers allocate non-coherent (i.e., cached) backing storage with dma_alloc_noncoherent(), but release it with dma_free_wc(). Fix this with a call to dma_free_noncoherent(). Writecombining storage is still released with dma_free_wc().
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Fixes: cf8ccbc72d61 ("drm: Add support for GEM buffers backed by non-coherent memory") Cc: Paul Cercueil paul@crapouillou.net Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/drm_gem_cma_helper.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index d53388199f34..9d05674550a4 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -210,8 +210,13 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) dma_buf_vunmap(gem_obj->import_attach->dmabuf, &map); drm_prime_gem_destroy(gem_obj, cma_obj->sgt); } else if (cma_obj->vaddr) { - dma_free_wc(gem_obj->dev->dev, cma_obj->base.size, - cma_obj->vaddr, cma_obj->paddr); + if (cma_obj->map_noncoherent) + dma_free_noncoherent(gem_obj->dev->dev, cma_obj->base.size, + cma_obj->vaddr, cma_obj->paddr, + DMA_TO_DEVICE); + else + dma_free_wc(gem_obj->dev->dev, cma_obj->base.size, + cma_obj->vaddr, cma_obj->paddr); }
drm_gem_object_release(gem_obj);