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drm/msm: fix NULL-deref on snapshot tear down

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commit a465353b9250802f87b97123e33a17f51277f0b1 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: 98659487b8 ("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>
This commit is contained in:
Johan Hovold 2023-03-06 11:07:15 +01:00 committed by Greg Kroah-Hartman
parent 5b6b81decd
commit 16e0e6fb45
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/msm/msm_drv.c
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@ -241,7 +241,8 @@ static int msm_drm_uninit(struct device *dev)
msm_fbdev_free(ddev);
#endif
msm_disp_snapshot_destroy(ddev);
if (kms)
msm_disp_snapshot_destroy(ddev);
drm_mode_config_cleanup(ddev);