drm/nouveau/pmu: serialise send() with private mutex

nvkm_subdev.mutex is going away.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
index a0fe607c9c07..94253304bb90 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
@@ -148,6 +148,7 @@ nvkm_pmu_dtor(struct nvkm_subdev *subdev)
 	nvkm_falcon_cmdq_del(&pmu->hpq);
 	nvkm_falcon_qmgr_del(&pmu->qmgr);
 	nvkm_falcon_dtor(&pmu->falcon);
+	mutex_destroy(&pmu->send.mutex);
 	return nvkm_pmu(subdev);
 }
 
@@ -168,6 +169,8 @@ nvkm_pmu_ctor(const struct nvkm_pmu_fwif *fwif, struct nvkm_device *device,
 
 	nvkm_subdev_ctor(&nvkm_pmu, device, index, &pmu->subdev);
 
+	mutex_init(&pmu->send.mutex);
+
 	INIT_WORK(&pmu->recv.work, nvkm_pmu_recv);
 	init_waitqueue_head(&pmu->recv.wait);