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[2/2] Revert "drm/amdgpu: fix a potential deadlock in amdgpu_bo_create_restricted()"

Message ID 20170214091845.1225-3-nhaehnle@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Nicolai Hähnle Feb. 14, 2017, 9:18 a.m. UTC 
From: Nicolai Hähnle <nicolai.haehnle@amd.com>

This reverts commit 38fc4856ad98f230bc91da0421dec69e4aee40f8, which
introduces a use-after-free.

The underlying bug should be properly fixed with "drm/ttm: never add BO
that failed to validate to the LRU list".

Cc: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Cc: zhoucm1 <david1.zhou@amd.com>
Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 556236a..d1ef1d0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -403,11 +403,8 @@  int amdgpu_bo_create_restricted(struct amdgpu_device *adev,
 			&bo->placement, page_align, !kernel, NULL,
 			acc_size, sg, resv ? resv : &bo->tbo.ttm_resv,
 			&amdgpu_ttm_bo_destroy);
-	if (unlikely(r != 0)) {
-		if (!resv)
-			ww_mutex_unlock(&bo->tbo.resv->lock);
+	if (unlikely(r != 0))
 		return r;
-	}
 
 	bo->tbo.priority = ilog2(bo->tbo.num_pages);
 	if (kernel)