linux-kernel - [PATCH AUTOSEL 4.4 06/14] Input: snvs_pwrkey - initialize necessary driver data before enabling IRQ

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Message-Id: <20190507054218.340-6-sashal@kernel.org>
Date:   Tue,  7 May 2019 01:42:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Anson Huang <anson.huang@....com>,
        Anson Huang <Anson.Huang@....com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>, linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 06/14] Input: snvs_pwrkey - initialize necessary driver data before enabling IRQ

From: Anson Huang <anson.huang@....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@....com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 9adf13a5864a..57143365e945 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);
@@ -172,9 +175,6 @@ 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