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From:   Roger Lu <roger.lu@mediatek.com>
To:     Matthias Brugger <matthias.bgg@gmail.com>,
        Enric Balletbo Serra <eballetbo@gmail.com>,
        Kevin Hilman <khilman@kernel.org>,
        Nicolas Boichat <drinkcat@google.com>
CC:     Fan Chen <fan.chen@mediatek.com>, Roger Lu <roger.lu@mediatek.com>,
        Jia-wei Chang <jia-wei.chang@mediatek.com>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <linux-pm@vger.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@mediatek.com>,
        Ricardo Ribalda <ribalda@chromium.org>
Subject: [PATCH v2 01/13] soc: mediatek: mtk-svs: enable the IRQ later
Date:   Tue, 27 Dec 2022 20:09:02 +0800
Message-ID: <20221227120914.11346-2-roger.lu@mediatek.com>
In-Reply-To: <20221227120914.11346-1-roger.lu@mediatek.com>
References: <20221227120914.11346-1-roger.lu@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

From: Ricardo Ribalda <ribalda@chromium.org>

If the system does not come from reset (like when is booted via
kexec(), the peripheral might trigger an IRQ before the data structures
are initialized.

Fixes:

[    0.227710] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000f08
[    0.227913] Call trace:
[    0.227918]  svs_isr+0x8c/0x538

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Roger Lu <roger.lu@mediatek.com>
---
 drivers/soc/mediatek/mtk-svs.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
index 0469c9dfeb04..91e06f43969d 100644
--- a/drivers/soc/mediatek/mtk-svs.c
+++ b/drivers/soc/mediatek/mtk-svs.c
@@ -2379,20 +2379,6 @@ static int svs_probe(struct platform_device *pdev)
 		goto svs_probe_free_resource;
 	}
 
-	svsp_irq = platform_get_irq(pdev, 0);
-	if (svsp_irq < 0) {
-		ret = svsp_irq;
-		goto svs_probe_free_resource;
-	}
-
-	ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
-					IRQF_ONESHOT, svsp->name, svsp);
-	if (ret) {
-		dev_err(svsp->dev, "register irq(%d) failed: %d\n",
-			svsp_irq, ret);
-		goto svs_probe_free_resource;
-	}
-
 	svsp->main_clk = devm_clk_get(svsp->dev, "main");
 	if (IS_ERR(svsp->main_clk)) {
 		dev_err(svsp->dev, "failed to get clock: %ld\n",
@@ -2414,6 +2400,20 @@ static int svs_probe(struct platform_device *pdev)
 		goto svs_probe_clk_disable;
 	}
 
+	svsp_irq = platform_get_irq(pdev, 0);
+	if (svsp_irq < 0) {
+		ret = svsp_irq;
+		goto svs_probe_iounmap;
+	}
+
+	ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
+					IRQF_ONESHOT, svsp->name, svsp);
+	if (ret) {
+		dev_err(svsp->dev, "register irq(%d) failed: %d\n",
+			svsp_irq, ret);
+		goto svs_probe_iounmap;
+	}
+
 	ret = svs_start(svsp);
 	if (ret) {
 		dev_err(svsp->dev, "svs start fail: %d\n", ret);
-- 
2.18.0