From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Fri, 1 Jun 2012 13:39:11 +0000 (+0200)
Subject: drm/ttm: Fix spinlock imbalance
X-Git-Tag: v3.5-rc1~12^2~3
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=a8ff3ee211fccf708e1911bbc096625453ebf759;p=~emulex%2Finfiniband.git

drm/ttm: Fix spinlock imbalance

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@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 36792bd4da7..b67cfcaa661 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1834,6 +1834,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
 			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;
 		}