This commit should be backported to kernel 4.3 (apologies for
line-wrapping). Without it, we get a null deref (i.e. oops) on GF117
GPUs which for one reason or another don't have the PMU hooked up.
That should be fixed in its own right, but that's a separate matter.
The issue was introduced in commit e2ca4e7d6e (drm/nouveau/pmu:
convert to new-style nvkm_subdev)
commit 579b7c58215329803ce184704463de09f0f310ac
Author: Alexandre Courbot <acourbot@xxxxxxxxxx>
Date: Thu Sep 3 17:39:52 2015 +0900
drm/nouveau/pmu: do not assume a PMU is present
Some devices may not have a PMU. Avoid a NULL pointer dereference in
such cases by checking whether the pointer given to nvkm_pmu_pgob() is
valid.
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
index 27a79c0..d95eb86 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
@@ -28,7 +28,7 @@
void
nvkm_pmu_pgob(struct nvkm_pmu *pmu, bool enable)
{
- if (pmu->func->pgob)
+ if (pmu && pmu->func->pgob)
pmu->func->pgob(pmu, enable);
}
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