Re: [PATCH v1 09/16] rtc: mediatek: convert to use device managed functions

Alexandre Belloni
2018-03-23T10:50:22Z

On 23/03/2018 at 17:15:06 +0800, sean.wang@mediatek.com wrote:
> From: Sean Wang <sean.wang@mediatek.com>
>
> Use device managed operation to simplify error handling, reduce source
> code size, and reduce the likelyhood of bugs, and remove our removal
> callback which contains anything already done by device managed functions.
>
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> ---
> drivers/rtc/rtc-mt6397.c | 31 ++++++++-----------------------
> 1 file changed, 8 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
> index cefb83b..bfc5d6f 100644
> --- a/drivers/rtc/rtc-mt6397.c
> +++ b/drivers/rtc/rtc-mt6397.c
> @@ -14,6 +14,7 @@
>
> #include <linux/delay.h>
> #include <linux/init.h>
> +#include <linux/interrupt.h>
> #include <linux/module.h>
> #include <linux/regmap.h>
> #include <linux/rtc.h>
> @@ -328,10 +329,10 @@ static int mtk_rtc_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, rtc);
>
> - ret = request_threaded_irq(rtc->irq, NULL,
> - mtk_rtc_irq_handler_thread,
> - IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
> - "mt6397-rtc", 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);
> @@ -340,30 +341,15 @@ static int mtk_rtc_probe(struct platform_device *pdev)
>
> device_init_wakeup(&pdev->dev, 1);
>
> - rtc->rtc_dev = rtc_device_register("mt6397-rtc", &pdev->dev,
> - &mtk_rtc_ops, THIS_MODULE);
> + rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "mt6397-rtc",
> + &mtk_rtc_ops, THIS_MODULE);

You should probably switch to devm_rtc_allocate_device() and
rtc_register_device instead of devm_rtc_device_register.

> if (IS_ERR(rtc->rtc_dev)) {
> dev_err(&pdev->dev, "register rtc device failed\n");
> ret = PTR_ERR(rtc->rtc_dev);
> - goto out_free_irq;
> + return ret;

ret doesn't seem necessary anymore here.

--
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering