linux-kernel - Re: [PATCH v1 08/16] rtc: mediatek: remove unnecessary irq_dispose

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Message-ID: <1522030927.18424.11.camel@mtkswgap22>
Date:   Mon, 26 Mar 2018 10:22:07 +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 08/16] rtc: mediatek: remove unnecessary
 irq_dispose_mapping

On Fri, 2018-03-23 at 11:38 +0100, Alexandre Belloni wrote:
> On 23/03/2018 at 17:15:05 +0800, sean.wang@...iatek.com wrote:
> > From: Sean Wang <sean.wang@...iatek.com>
> > 
> > It's unnecessary doing irq_dispose_mapping as a reverse operation for
> > platform_get_irq.
> > 
> > Ususally, irq_dispose_mapping should be called in error path or module
> > removal to release the resources for irq_of_parse_and_map requested.
> > 
> > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> > ---
> >  drivers/rtc/rtc-mt6397.c | 7 ++-----
> >  1 file changed, 2 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
> > index b62eaa8..cefb83b 100644
> > --- a/drivers/rtc/rtc-mt6397.c
> > +++ b/drivers/rtc/rtc-mt6397.c
> > @@ -17,7 +17,6 @@
> >  #include <linux/module.h>
> >  #include <linux/regmap.h>
> >  #include <linux/rtc.h>
> > -#include <linux/irqdomain.h>
> >  #include <linux/jiffies.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/of_address.h>
> > @@ -336,7 +335,7 @@ static int mtk_rtc_probe(struct platform_device *pdev)
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
> >  			rtc->irq, ret);
> > -		goto out_dispose_irq;
> > +		return ret;
> >  	}
> >  
> >  	device_init_wakeup(&pdev->dev, 1);
> > @@ -353,8 +352,7 @@ static int mtk_rtc_probe(struct platform_device *pdev)
> >  
> >  out_free_irq:
> >  	free_irq(rtc->irq, rtc->rtc_dev);
> > -out_dispose_irq:
> > -	irq_dispose_mapping(rtc->irq);
> > +
> 
> Don't you still have a irq_create_mapping?
> 

Sorry for that I didn't mention in the beginning that the series must
depend on another patch [1]. With the patch, the job irq_create_mapping
had been moved from rtc to mfd, so here it should be better to cleanup
up irq_dispose_mapping in all paths.

[1] https://patchwork.kernel.org/patch/9954643/

> >  	return ret;
> >  }
> >  
> > @@ -364,7 +362,6 @@ static int mtk_rtc_remove(struct platform_device *pdev)
> >  
> >  	rtc_device_unregister(rtc->rtc_dev);
> >  	free_irq(rtc->irq, rtc->rtc_dev);
> > -	irq_dispose_mapping(rtc->irq);
> >  
> >  	return 0;
> >  }
> > -- 
> > 2.7.4
> > 
>