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    Subject[PATCH 4.3 194/200] drm/nouveau/pmu: do not assume a PMU is present
    Date
    4.3-stable review patch.  If anyone has any objections, please let me know.

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

    From: Alexandre Courbot <acourbot@nvidia.com>

    commit 579b7c58215329803ce184704463de09f0f310ac upstream.

    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@nvidia.com>
    Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- 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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