From: Christian König <christian.koenig@amd.com>
Date: Mon, 11 Jan 2016 14:35:18 +0000 (+0100)
Subject: drm/ttm: fix adding foreign BOs to the LRU during init v2
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=33d48cf8256f2b72e4082a7996c04bf1e78fce81;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

drm/ttm: fix adding foreign BOs to the LRU during init v2

If we import a BO with an external reservation object we don't
reserve/unreserve it. So we never add it to the LRU causing a possible
denial of service.

v2: fix typo in commit message

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 745e996d2dbc..a98a5d5d756d 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1170,9 +1170,15 @@ int ttm_bo_init(struct ttm_bo_device *bdev,
 	if (likely(!ret))
 		ret = ttm_bo_validate(bo, placement, interruptible, false);
 
-	if (!resv)
+	if (!resv) {
 		ttm_bo_unreserve(bo);
 
+	} else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
+		spin_lock(&bo->glob->lru_lock);
+		ttm_bo_add_to_lru(bo);
+		spin_unlock(&bo->glob->lru_lock);
+	}
+
 	if (unlikely(ret))
 		ttm_bo_unref(&bo);