linux-kernel - [ 14/42] drm/ttm: Fix buffer object metadata accounting regression v2

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Date:	Thu, 14 Jun 2012 16:56:37 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Thomas Hellstrom <thellstrom@...are.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jerome Glisse <jglisse@...hat.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 14/42] drm/ttm: Fix buffer object metadata accounting regression v2

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Hellstrom <thellstrom@...are.com>

commit a393c730ab69617c3291a3b0b2a228c9be2fc28c upstream.

A regression was introduced in the 3.3 rc series, commit
"drm/ttm: simplify memory accounting for ttm user v2",
causing the metadata of buffer objects created using the ttm_bo_create()
function to be accounted twice.
That causes massive leaks with the vmwgfx driver running for example
SpecViewperf Catia-03 test 2, eventually killing the app.

Furthermore, the same commit introduces a regression where
metadata accounting is leaked if a buffer object is
initialized with an illegal size. This is also fixed with this commit.

v2: Fixed an error path and removed an unused variable.

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Jerome Glisse <jglisse@...hat.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/ttm/ttm_bo.c |   13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1193,6 +1193,7 @@ int ttm_bo_init(struct ttm_bo_device *bd
 			(*destroy)(bo);
 		else
 			kfree(bo);
+		ttm_mem_global_free(mem_glob, acc_size);
 		return -EINVAL;
 	}
 	bo->destroy = destroy;
@@ -1294,22 +1295,14 @@ int ttm_bo_create(struct ttm_bo_device *
 			struct ttm_buffer_object **p_bo)
 {
 	struct ttm_buffer_object *bo;
-	struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
 	size_t acc_size;
 	int ret;
 
-	acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
-	ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
-	if (unlikely(ret != 0))
-		return ret;
-
 	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
-
-	if (unlikely(bo == NULL)) {
-		ttm_mem_global_free(mem_glob, acc_size);
+	if (unlikely(bo == NULL))
 		return -ENOMEM;
-	}
 
+	acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
 	ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
 				buffer_start, interruptible,
 				persistent_swap_storage, acc_size, NULL);


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