[Nouveau] [PATCH v4 24/33] pmu: make sure the reset hook exists before running it

[Alexandre Courbot]

Some PMU implementations (in particular the ones managed by secure
boot) may not have a reset() hook. Make sure we don't crash in that
case.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
---
 drm/nouveau/nvkm/subdev/pmu/base.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drm/nouveau/nvkm/subdev/pmu/base.c b/drm/nouveau/nvkm/subdev/pmu/base.c
index c7f432ca79ca..5548258a4510 100644
--- a/drm/nouveau/nvkm/subdev/pmu/base.c
+++ b/drm/nouveau/nvkm/subdev/pmu/base.c
@@ -85,7 +85,8 @@ nvkm_pmu_reset(struct nvkm_pmu *pmu)
 	);
 
 	/* Reset. */
-	pmu->func->reset(pmu);
+	if (pmu->func->reset)
+		pmu->func->reset(pmu);
 
 	/* Wait for IMEM/DMEM scrubbing to be complete. */
 	nvkm_msec(device, 2000,
-- 
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