This is a note to let you know that I've just added the patch titled
drm/mediatek: fix null pointer dereference
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-mediatek-fix-null-pointer-dereference.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5ad45307d990020b25a8f7486178b6e033790f70 Mon Sep 17 00:00:00 2001
From: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Date: Fri, 18 Nov 2016 11:06:10 +0100
Subject: drm/mediatek: fix null pointer dereference
From: Matthias Brugger <matthias.bgg@xxxxxxxxx>
commit 5ad45307d990020b25a8f7486178b6e033790f70 upstream.
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@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Change-Id: I57193a7ab554dfb37c35a455900689333adf511c
---
drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -249,13 +249,6 @@ static int mtk_disp_ovl_probe(struct pla
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);
@@ -271,6 +264,13 @@ static int mtk_disp_ovl_probe(struct pla
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);
Patches currently in stable-queue which might be from matthias.bgg@xxxxxxxxx are
queue-4.8/drm-mediatek-fix-null-pointer-dereference.patch
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