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: v3.0.34~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=166ab4d1f2a1fae8f2cbe43da0e35befadc1e90b;p=people%2Fms%2Flinux.git

drm/ttm: Fix spinlock imbalance

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@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 81b68508dc13..7632edb2f46e 100644
--- 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_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;
 		}