linux-kernel - [PATCH AUTOSEL 5.3 61/99] drm/ttm: fix busy reference in ttm_mem_evict

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Date:   Sat, 26 Oct 2019 09:15:22 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christian König <christian.koenig@....com>,
        Thomas Hellström <thellstrom@...are.com>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.3 61/99] drm/ttm: fix busy reference in ttm_mem_evict_first

From: Christian König <christian.koenig@....com>

[ Upstream commit 73a88e4ce31055c415f1ddb55e3f08c9393cf4e3 ]

The busy BO might actually be already deleted,
so grab only a list reference.

Signed-off-by: Christian König <christian.koenig@....com>
Reviewed-by: Thomas Hellström <thellstrom@...are.com>
Link: https://patchwork.freedesktop.org/patch/332877/
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 58c403eda04e7..c2df735a8f82c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -874,11 +874,11 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 
 	if (!bo) {
 		if (busy_bo)
-			ttm_bo_get(busy_bo);
+			kref_get(&busy_bo->list_kref);
 		spin_unlock(&glob->lru_lock);
 		ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 		if (busy_bo)
-			ttm_bo_put(busy_bo);
+			kref_put(&busy_bo->list_kref, ttm_bo_release_list);
 		return ret;
 	}
 
-- 
2.20.1