media: imx-pxp: Initialize the spinlock prior to using it

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@denx.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/platform/imx-pxp.c b/drivers/media/platform/imx-pxp.c
index 723b096..b717477 100644 (file)
--- a/drivers/media/platform/imx-pxp.c
+++ b/drivers/media/platform/imx-pxp.c
@@ -1659,6 +1659,8 @@ 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) {
@@ -1676,8 +1678,6 @@ 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;