[v1,08/16] rtc: mediatek: remove unnecessary irq_dispose_mapping

From: Sean Wang <sean.wang@mediatek.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@mediatek.com>
---
 drivers/rtc/rtc-mt6397.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

On 23/03/2018 at 17:15:05 +0800, sean.wang@mediatek.com wrote:
> From: Sean Wang <sean.wang@mediatek.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@mediatek.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?

>  	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
>

On Fri, 2018-03-23 at 11:38 +0100, Alexandre Belloni wrote:
> On 23/03/2018 at 17:15:05 +0800, sean.wang@mediatek.com wrote:
> > From: Sean Wang <sean.wang@mediatek.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@mediatek.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
> > 
>