The patch below does not apply to the 5.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 35f819d218035ddfbc71e7cf62a4849231701e58 Mon Sep 17 00:00:00 2001

From: xinhui pan xinhui.pan@amd.com Date: Fri, 21 May 2021 16:31:12 +0800 Subject: [PATCH] drm/ttm: Skip swapout if ttm object is not populated MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

Swapping a ttm object which has no backend pages makes no sense.

Suggested-by: Christian König christian.koenig@amd.com Signed-off-by: xinhui pan xinhui.pan@amd.com Reviewed-by: Christian König christian.koenig@amd.com Link: https://patchwork.freedesktop.org/patch/msgid/20210521083112.33176-1-xinhui.... CC: stable@kernel.org Signed-off-by: Christian König christian.koenig@amd.com

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c index 510e3e001dab..a1dcf7d55c90 100644 --- a/drivers/gpu/drm/ttm/ttm_device.c +++ b/drivers/gpu/drm/ttm/ttm_device.c @@ -145,7 +145,7 @@ int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx, list_for_each_entry(bo, &man->lru[j], lru) { uint32_t num_pages;

- if (!bo->ttm || + if (!bo->ttm || !ttm_tt_is_populated(bo->ttm) || bo->ttm->page_flags & TTM_PAGE_FLAG_SG || bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) continue;