linux-kernel - [ 29/47] drm/ttm: Fix spinlock imbalance

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Date:	Thu, 07 Jun 2012 13:14:27 +0900
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>,
	Jakob Bornecrantz <jakob@...are.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 29/47] drm/ttm: Fix spinlock imbalance

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

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

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

commit a8ff3ee211fccf708e1911bbc096625453ebf759 upstream.

This imbalance may cause hangs when TTM is trying to swap out a buffer
that is already on the delayed delete list.

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Jakob Bornecrantz <jakob@...are.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 |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1809,6 +1809,7 @@ static int ttm_bo_swapout(struct ttm_mem
 			spin_unlock(&glob->lru_lock);
 			(void) ttm_bo_cleanup_refs(bo, false, false, false);
 			kref_put(&bo->list_kref, ttm_bo_release_list);
+			spin_lock(&glob->lru_lock);
 			continue;
 		}
 


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