[Nouveau] [PATCH] graph/nve4: do not crash if no power device present

[Alexandre Courbot]

Detect and workaround the absence of a power device so chips that do not
feature one (e.g. GK20A) can still use this driver.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
---
 nvkm/engine/graph/nve4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nvkm/engine/graph/nve4.c b/nvkm/engine/graph/nve4.c
index 1ba6666da4e5..fb9cb929320d 100644
--- a/nvkm/engine/graph/nve4.c
+++ b/nvkm/engine/graph/nve4.c
@@ -203,7 +203,8 @@ nve4_graph_init(struct nouveau_object *object)
 	int gpc, tpc, rop;
 	int ret, i;
 
-	ppwr->pgob(ppwr, false);
+	if (ppwr)
+		ppwr->pgob(ppwr, false);
 
 	ret = nouveau_graph_init(&priv->base);
 	if (ret)
-- 
2.0.1