drm/mediatek: fix null pointer dereference

The probe function requests the interrupt before initializing
the ddp component. Which leads to a null pointer dereference at boot.
Fix this by requesting the interrput after all components got
initialized properly.

Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC
MT8173.")
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Change-Id: I57193a7ab554dfb37c35a455900689333adf511c

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index f75c5b5a536c7a83cac6119a1d8a255792712172..c70310206ac56fd76eeb93ae76af669f1f2870a7 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -251,13 +251,6 @@ static int mtk_disp_ovl_probe(struct platform_device *pdev)
        if (irq < 0)
                return irq;
 
-       ret = devm_request_irq(dev, irq, mtk_disp_ovl_irq_handler,
-                              IRQF_TRIGGER_NONE, dev_name(dev), priv);
-       if (ret < 0) {
-               dev_err(dev, "Failed to request irq %d: %d\n", irq, ret);
-               return ret;
-       }
-
        comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DISP_OVL);
        if (comp_id < 0) {
                dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
@@ -273,6 +266,13 @@ static int mtk_disp_ovl_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, priv);
 
+       ret = devm_request_irq(dev, irq, mtk_disp_ovl_irq_handler,
+                              IRQF_TRIGGER_NONE, dev_name(dev), priv);
+       if (ret < 0) {
+               dev_err(dev, "Failed to request irq %d: %d\n", irq, ret);
+               return ret;
+       }
+
        ret = component_add(dev, &mtk_disp_ovl_component_ops);
        if (ret)
                dev_err(dev, "Failed to add component: %d\n", ret);