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drm/msm: fix NULL-deref on snapshot tear down
commit a465353 upstream. In case of early initialisation errors and on platforms that do not use the DPU controller, the deinitilisation code can be called with the kms pointer set to NULL. Fixes: 9865948 ("drm/msm: add support to take dpu snapshot") Cc: stable@vger.kernel.org # 5.14 Cc: Abhinav Kumar <quic_abhinavk@quicinc.com> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Patchwork: https://patchwork.freedesktop.org/patch/525099/ Link: https://lore.kernel.org/r/20230306100722.28485-4-johan+linaro@kernel.org Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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