From: Dave Airlie airlied@redhat.com

commit 5de5b6ecf97a021f29403aa272cb4e03318ef586 upstream.

This is confusing, and from my reading of all the drivers only nouveau got this right.

Just make the API act under driver control of it's own allocation failing, and don't call destroy, if the page table fails to create there is nothing to cleanup here.

(I'm willing to believe I've missed something here, so please review deeply).

Reviewed-by: Christian König christian.koenig@amd.com Signed-off-by: Dave Airlie airlied@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20200728041736.20689-1-airlied... [bwh: Backported to 4.14: - Drop change in ttm_sg_tt_init() - Adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/gpu/drm/nouveau/nouveau_sgdma.c | 9 +++------ drivers/gpu/drm/ttm/ttm_tt.c | 2 -- 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c index fde11ce466e4..495c4043467e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c +++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c @@ -106,12 +106,9 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev, else nvbe->ttm.ttm.func = &nv50_sgdma_backend;

- if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page)) - /* - * A failing ttm_dma_tt_init() will call ttm_tt_destroy() - * and thus our nouveau_sgdma_destroy() hook, so we don't need - * to free nvbe here. - */ + if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page)) { + kfree(nvbe); return NULL; + } return &nvbe->ttm.ttm; } diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 8ebc8d3560c3..fc8bdcc1541b 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -199,7 +199,6 @@ int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,

ttm_tt_alloc_page_directory(ttm); if (!ttm->pages) { - ttm_tt_destroy(ttm); pr_err("Failed allocating page table\n"); return -ENOMEM; } @@ -232,7 +231,6 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, INIT_LIST_HEAD(&ttm_dma->pages_list); ttm_dma_tt_alloc_page_directory(ttm_dma); if (!ttm->pages) { - ttm_tt_destroy(ttm); pr_err("Failed allocating page table\n"); return -ENOMEM; }