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SubjectRe: [PATCH 2/2] mfd: fsl-imx25: clean up irq settings during removal
On Tue, 12 Sep 2017, Martin Kaiser wrote:

> When fsl-imx25-tsadc is compiled as a module, unloading and reloading
> the module will lead to a crash.
>
> Add a removal function which clears the irq handler and removes the irq
> domain. With this cleanup in place, it's possible to unload and reload
> the module.

More information please.

What is it specifically that causes the crash?

Why is this code not required? What's stopping this causing a leak?

> Signed-off-by: Martin Kaiser <martin@kaiser.cx>
> ---
> drivers/mfd/fsl-imx25-tsadc.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c
> index 14189ef..a6423bd 100644
> --- a/drivers/mfd/fsl-imx25-tsadc.c
> +++ b/drivers/mfd/fsl-imx25-tsadc.c
> @@ -179,6 +179,19 @@ static int mx25_tsadc_probe(struct platform_device *pdev)
> return devm_of_platform_populate(dev);
> }
>
> +static int __exit mx25_tsadc_remove(struct platform_device *pdev)
> +{
> + struct mx25_tsadc *tsadc = platform_get_drvdata(pdev);
> + int irq = platform_get_irq(pdev, 0);
> +
> + if (irq) {
> + irq_set_chained_handler_and_data(irq, NULL, NULL);
> + irq_domain_remove(tsadc->domain);
> + }
> +
> + return 0;
> +}
> +
> static const struct of_device_id mx25_tsadc_ids[] = {
> { .compatible = "fsl,imx25-tsadc" },
> { /* Sentinel */ }
> @@ -191,6 +204,7 @@ static struct platform_driver mx25_tsadc_driver = {
> .of_match_table = of_match_ptr(mx25_tsadc_ids),
> },
> .probe = mx25_tsadc_probe,
> + .remove = __exit_p(mx25_tsadc_remove),
> };
> module_platform_driver(mx25_tsadc_driver);
>

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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