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drm/msm: fix NULL-deref on irq uninstall

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commit cd459c005d 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: f026e431cf ("drm/msm: Convert to Linux IRQ interfaces")
Cc: stable@vger.kernel.org	# 5.14
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/525104/
Link: https://lore.kernel.org/r/20230306100722.28485-5-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 11:07:16 +01:00
committed by Greg Kroah-Hartman
parent 8f0e1ad532
commit e2d1cc82ad
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/msm/msm_drv.c
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@@ -364,9 +364,11 @@ static int msm_drm_uninit(struct device *dev)
drm_mode_config_cleanup(ddev);
pm_runtime_get_sync(dev);
msm_irq_uninstall(ddev);
pm_runtime_put_sync(dev);
if (kms) {
pm_runtime_get_sync(dev);
msm_irq_uninstall(ddev);
pm_runtime_put_sync(dev);
}
if (kms && kms->funcs)
kms->funcs->destroy(kms);