Re: [PATCH v2 2/3] rtc: mediatek: Add MT6397 RTC driver

Dmitry Torokhov
2015-03-21T05:25:52Z

Hi Eddie,

On Tue, Mar 17, 2015 at 10:45 PM, Eddie Huang <eddie.huang@mediatek.com> wrote:
> +static int mtk_rtc_probe(struct platform_device *pdev)
> +{
> + struct resource *res;
> + struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
> + struct mt6397_rtc *rtc;
> + int ret = 0;
> +
> + rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
> + if (!rtc)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + rtc->addr_base = res->start;
> + rtc->addr_range = res->end - res->start;
> +
> + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + rtc->irq = irq_create_mapping(mt6397_chip->irq_domain, res->start);
> + if (rtc->irq <= 0)
> + goto out_rtc;
> +
> + rtc->regmap = mt6397_chip->regmap;
> + rtc->dev = &pdev->dev;
> + mutex_init(&rtc->lock);
> +
> + platform_set_drvdata(pdev, rtc);
> +
> + ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
> + mtk_rtc_irq_handler_thread,
> + IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
> + "mt6397-rtc", rtc);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
> + rtc->irq, ret);
> + goto out_rtc;
> + }
> +
> + rtc->rtc_dev = rtc_device_register("mt6397-rtc", &pdev->dev,
> + &mtk_rtc_ops, THIS_MODULE);
> + if (IS_ERR(rtc->rtc_dev)) {
> + dev_err(&pdev->dev, "register rtc device failed\n");
> + return PTR_ERR(rtc->rtc_dev);
> + }
> +
> + device_init_wakeup(&pdev->dev, 1);
> +
> + return 0;
> +
> +out_rtc:
> + rtc_device_unregister(rtc->rtc_dev);

This is wrong. Whenever you jump to this label the RTC device has not
been registered yet.

> + return ret;
> +
> +}
> +