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

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Date:   Mon, 26 Mar 2018 12:07:45 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:     <robh+dt@...nel.org>, <mark.rutland@....com>, <sre@...nel.org>,
        <lee.jones@...aro.org>, <a.zummo@...ertech.it>,
        <eddie.huang@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-rtc@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 09/16] rtc: mediatek: convert to use device managed
 functions

On Fri, 2018-03-23 at 11:50 +0100, Alexandre Belloni wrote:
> On 23/03/2018 at 17:15:06 +0800, sean.wang@...iatek.com wrote:
> > From: Sean Wang <sean.wang@...iatek.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@...iatek.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.
> 

Just would like to know something details

It seems you just encourage me to switch into the new registration
method and currently devm_rtc_device_register I used for the driver
shouldn't cause any harm. right?

> >  	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.


okay, it'll be removed

> 
>