[PATCH 4.1 120/123] drm/nouveau: hold mutex when calling nouveau_abi16_fini()

[Greg Kroah-Hartman]

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

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

From: Kamil Dudka <kdudka@xxxxxxxxxx>

commit ac8c79304280da6ef05c348a9da03ab04898b994 upstream.

This was the only access to cli->abi16 without holding the mutex.

Signed-off-by: Kamil Dudka <kdudka@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/nouveau/nouveau_drm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -863,8 +863,10 @@ nouveau_drm_preclose(struct drm_device *
 
 	pm_runtime_get_sync(dev->dev);
 
+	mutex_lock(&cli->mutex);
 	if (cli->abi16)
 		nouveau_abi16_fini(cli->abi16);
+	mutex_unlock(&cli->mutex);
 
 	mutex_lock(&drm->client.mutex);
 	list_del(&cli->head);


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