linux-kernel - Re: [PATCH 4/4] iio: adc: xilinx: Use devm

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Date:   Thu, 19 Jul 2018 18:37:54 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Manish Narani <manish.narani@...inx.com>, jic23@...nel.org,
        knaack.h@....de, pmeerw@...erw.net, michal.simek@...inx.com,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     anirudh@...inx.com, sgoud@...inx.com
Subject: Re: [PATCH 4/4] iio: adc: xilinx: Use devm_ functions while
 requesting irq

> @@ -1310,7 +1308,6 @@ static int xadc_remove(struct platform_device *pdev)
>  {
>  	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
>  	struct xadc *xadc = iio_priv(indio_dev);
> -	int irq = platform_get_irq(pdev, 0);
>  
>  	iio_device_unregister(indio_dev);
>  	if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
> @@ -1318,7 +1315,6 @@ static int xadc_remove(struct platform_device *pdev)
>  		iio_trigger_free(xadc->convst_trigger);
>  		iio_triggered_buffer_cleanup(indio_dev);
>  	}
> -	free_irq(irq, indio_dev);

This opens up a race condition. The IRQ needs to be freed before any of
these other things below the free_irq() are executed.

>  	clk_disable_unprepare(xadc->clk);
>  	cancel_delayed_work(&xadc->zynq_unmask_work);
>  	kfree(xadc->data);
>