linux-kernel - [PATCH 5.15 164/846] media: imx-pxp: Initialize the spinlock prior to using it

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Date:   Mon, 24 Jan 2022 19:34:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Fabio Estevam <festevam@...x.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 164/846] media: imx-pxp: Initialize the spinlock prior to using it

From: Fabio Estevam <festevam@...x.de>

[ Upstream commit ed2f97ad4b21072f849cf4ae6645d1f2b1d3f550 ]

After devm_request_threaded_irq() is called there is a chance that an
interrupt may occur before the spinlock is initialized, which will trigger
a kernel oops.

To prevent that, move the initialization of the spinlock prior to
requesting the interrupts.

Fixes: 51abcf7fdb70 ("media: imx-pxp: add i.MX Pixel Pipeline driver")
Signed-off-by: Fabio Estevam <festevam@...x.de>
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/imx-pxp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/imx-pxp.c b/drivers/media/platform/imx-pxp.c
index 4321edc0c23d9..8e9c6fee75a48 100644
--- a/drivers/media/platform/imx-pxp.c
+++ b/drivers/media/platform/imx-pxp.c
@@ -1661,6 +1661,8 @@ static int pxp_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
+	spin_lock_init(&dev->irqlock);
+
 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, pxp_irq_handler,
 			IRQF_ONESHOT, dev_name(&pdev->dev), dev);
 	if (ret < 0) {
@@ -1678,8 +1680,6 @@ static int pxp_probe(struct platform_device *pdev)
 		goto err_clk;
 	}
 
-	spin_lock_init(&dev->irqlock);
-
 	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 	if (ret)
 		goto err_clk;
-- 
2.34.1