[PATCH 04/10] drm/msm: fix NULL-deref on irq uninstall

[Johan Hovold]

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: f026e431cf86 ("drm/msm: Convert to Linux IRQ interfaces")
Cc: stable@xxxxxxxxxxxxxxx	# 5.14
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/msm_drv.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 17a59d73fe01..2f2bcdb671d2 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -251,9 +251,11 @@ static int msm_drm_uninit(struct device *dev)
 		drm_bridge_remove(priv->bridges[i]);
 	priv->num_bridges = 0;
 
-	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);
-- 
2.39.2