linux-kernel - Re: [PATCH 3/3] iio: adc: xilinx: prevent touching unclocked h/w on remove

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Date:   Sat, 16 Mar 2019 15:51:28 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Michal Simek <michal.simek@...inx.com>,
        Manish Narani <manish.narani@...inx.com>,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] iio: adc: xilinx: prevent touching unclocked h/w on
 remove

On Sun, 10 Mar 2019 14:58:26 -0400
Sven Van Asbroeck <thesven73@...il.com> wrote:

> In remove, the clock is disabled before canceling the
> delayed work. This means that the delayed work may be
> touching unclocked hardware.
> 
> Fix by disabling the clock after the delayed work is
> fully canceled. This is consistent with the probe error
> path order.
> 
> Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
Applied to the fixes-togreg branch of iio.git.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/xilinx-xadc-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
> index 15e1a103f37d..1ae86e7359f7 100644
> --- a/drivers/iio/adc/xilinx-xadc-core.c
> +++ b/drivers/iio/adc/xilinx-xadc-core.c
> @@ -1320,8 +1320,8 @@ static int xadc_remove(struct platform_device *pdev)
>  		iio_triggered_buffer_cleanup(indio_dev);
>  	}
>  	free_irq(xadc->irq, indio_dev);
> -	clk_disable_unprepare(xadc->clk);
>  	cancel_delayed_work_sync(&xadc->zynq_unmask_work);
> +	clk_disable_unprepare(xadc->clk);
>  	kfree(xadc->data);
>  	kfree(indio_dev->channels);
>