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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Anson Huang <anson.huang@nxp.com>,
        Anson Huang <Anson.Huang@nxp.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Sasha Levin <sashal@kernel.org>, linux-input@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 12/95] Input: snvs_pwrkey - initialize necessary driver data before enabling IRQ
Date:   Tue,  7 May 2019 01:37:01 -0400
Message-Id: <20190507053826.31622-12-sashal@kernel.org>
In-Reply-To: <20190507053826.31622-1-sashal@kernel.org>
References: <20190507053826.31622-1-sashal@kernel.org>
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From: Anson Huang <anson.huang@nxp.com>

[ Upstream commit bf2a7ca39fd3ab47ef71c621a7ee69d1813b1f97 ]

SNVS IRQ is requested before necessary driver data initialized,
if there is a pending IRQ during driver probe phase, kernel
NULL pointer panic will occur in IRQ handler. To avoid such
scenario, just initialize necessary driver data before enabling
IRQ. This patch is inspired by NXP's internal kernel tree.

Fixes: d3dc6e232215 ("input: keyboard: imx: add snvs power key driver")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/input/keyboard/snvs_pwrkey.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
index 7544888c4749..b8dbde746b4e 100644
--- a/drivers/input/keyboard/snvs_pwrkey.c
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -156,6 +156,9 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
 		return error;
 	}
 
+	pdata->input = input;
+	platform_set_drvdata(pdev, pdata);
+
 	error = devm_request_irq(&pdev->dev, pdata->irq,
 			       imx_snvs_pwrkey_interrupt,
 			       0, pdev->name, pdev);
@@ -171,9 +174,6 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
 		return error;
 	}
 
-	pdata->input = input;
-	platform_set_drvdata(pdev, pdata);
-
 	device_init_wakeup(&pdev->dev, pdata->wakeup);
 
 	return 0;
-- 
2.20.1