[PATCH v2] rtc: davinci: clean up probe/remove routines

[PATCH v2] rtc: davinci: clean up probe/remove routines

[Hannu Heikkinen]

Use the devres managed resource functions in the probe routine.
Also affects the remove routine where the previously used free and
release functions are not needed.

The devm_* functions eliminate the need for manual resource releasing and
simplify error handling.  Resources allocated by devm_* are freed
automatically on driver detach.

Signed-off-by: Hannu Heikkinen <hannuxx@iki.fi>
---
 drivers/rtc/rtc-davinci.c | 56 +++++++++++++----------------------------------
 1 file changed, 15 insertions(+), 41 deletions(-)

diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
index 14c2109..d24b573 100644
--- a/drivers/rtc/rtc-davinci.c
+++ b/drivers/rtc/rtc-davinci.c
@@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
 struct davinci_rtc {
 	struct rtc_device 		*rtc;
 	void __iomem			*base;
-	resource_size_t			pbase;
-	size_t				base_size;
 	int				irq;
 };
 
@@ -482,22 +480,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct davinci_rtc *davinci_rtc;
-	struct resource *res, *mem;
+	struct resource *res;
 	int ret = 0;
 
-	davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
+	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc),
+		GFP_KERNEL);
 	if (!davinci_rtc) {
 		dev_dbg(dev, "could not allocate memory for private data\n");
 		return -ENOMEM;
 	}
 
-	davinci_rtc->irq = platform_get_irq(pdev, 0);
-	if (davinci_rtc->irq < 0) {
-		dev_err(dev, "no RTC irq\n");
-		ret = davinci_rtc->irq;
-		goto fail1;
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "no mem resource\n");
@@ -505,23 +497,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 		goto fail1;
 	}
 
-	davinci_rtc->pbase = res->start;
-	davinci_rtc->base_size = resource_size(res);
-
-	mem = request_mem_region(davinci_rtc->pbase, davinci_rtc->base_size,
-				 pdev->name);
-	if (!mem) {
-		dev_err(dev, "RTC registers at %08x are not free\n",
-			davinci_rtc->pbase);
-		ret = -EBUSY;
-		goto fail1;
+	davinci_rtc->base = devm_request_and_ioremap(&pdev->dev, res);
+	if (!davinci_rtc->base) {
+		dev_err(&pdev->dev, "Unable to request mem region and grab IOs for device.\n");
+		return -EBUSY;
 	}
 
-	davinci_rtc->base = ioremap(davinci_rtc->pbase, davinci_rtc->base_size);
-	if (!davinci_rtc->base) {
-		dev_err(dev, "unable to ioremap MEM resource\n");
-		ret = -ENOMEM;
-		goto fail2;
+	davinci_rtc->irq = platform_get_irq(pdev, 0);
+	if (davinci_rtc->irq < 0) {
+		dev_err(dev, "no RTC irq\n");
+		return davinci_rtc->irq;
 	}
 
 	platform_set_drvdata(pdev, davinci_rtc);
@@ -529,9 +514,10 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 	davinci_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
 				    &davinci_rtc_ops, THIS_MODULE);
 	if (IS_ERR(davinci_rtc->rtc)) {
+		ret = PTR_ERR(davinci_rtc->rtc);
 		dev_err(dev, "unable to register RTC device, err %ld\n",
 				PTR_ERR(davinci_rtc->rtc));
-		goto fail3;
+		return ret;
 	}
 
 	rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
@@ -545,7 +531,7 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 			  0, "davinci_rtc", davinci_rtc);
 	if (ret < 0) {
 		dev_err(dev, "unable to register davinci RTC interrupt\n");
-		goto fail4;
+		goto err_dev_unreg;
 	}
 
 	/* Enable interrupts */
@@ -559,15 +545,8 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 
 	return 0;
 
-fail4:
+err_dev_unreg:
 	rtc_device_unregister(davinci_rtc->rtc);
-fail3:
-	platform_set_drvdata(pdev, NULL);
-	iounmap(davinci_rtc->base);
-fail2:
-	release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
-fail1:
-	kfree(davinci_rtc);
 
 	return ret;
 }
@@ -584,13 +563,8 @@ static int __devexit davinci_rtc_remove(struct platform_device *pdev)
 
 	rtc_device_unregister(davinci_rtc->rtc);
 
-	iounmap(davinci_rtc->base);
-	release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
-
 	platform_set_drvdata(pdev, NULL);
 
-	kfree(davinci_rtc);
-
 	return 0;
 }
 
-- 
1.7.12.2

Re: [PATCH v2] rtc: davinci: clean up probe/remove routines

[Sekhar Nori]

On 10/14/2012 3:13 PM, Hannu Heikkinen wrote:
> Use the devres managed resource functions in the probe routine.
> Also affects the remove routine where the previously used free and
> release functions are not needed.
> 
> The devm_* functions eliminate the need for manual resource releasing and
> simplify error handling.  Resources allocated by devm_* are freed
> automatically on driver detach.
> 
> Signed-off-by: Hannu Heikkinen <hannuxx@iki.fi>
> ---
>  drivers/rtc/rtc-davinci.c | 56 +++++++++++++----------------------------------
>  1 file changed, 15 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
> index 14c2109..d24b573 100644
> --- a/drivers/rtc/rtc-davinci.c
> +++ b/drivers/rtc/rtc-davinci.c
> @@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
>  struct davinci_rtc {
>  	struct rtc_device 		*rtc;
>  	void __iomem			*base;
> -	resource_size_t			pbase;
> -	size_t				base_size;
>  	int				irq;
>  };
>  
> @@ -482,22 +480,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct davinci_rtc *davinci_rtc;
> -	struct resource *res, *mem;
> +	struct resource *res;
>  	int ret = 0;
>  
> -	davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
> +	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc),
> +		GFP_KERNEL);
>  	if (!davinci_rtc) {
>  		dev_dbg(dev, "could not allocate memory for private data\n");
>  		return -ENOMEM;
>  	}
>  
> -	davinci_rtc->irq = platform_get_irq(pdev, 0);
> -	if (davinci_rtc->irq < 0) {
> -		dev_err(dev, "no RTC irq\n");
> -		ret = davinci_rtc->irq;
> -		goto fail1;
> -	}
> -
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!res) {
>  		dev_err(dev, "no mem resource\n");
> @@ -505,23 +497,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
>  		goto fail1;

As mentioned last time, this will have a build break here because fail1
is being removed down below.

Thanks,
Sekhar

Re: [PATCH v2] rtc: davinci: clean up probe/remove routines

[Hannu Heikkinen]

On 14/10/12 18:06 +0530, Sekhar Nori wrote:
> On 10/14/2012 3:13 PM, Hannu Heikkinen wrote:
> > Use the devres managed resource functions in the probe routine.
> > Also affects the remove routine where the previously used free and
> > release functions are not needed.
> > 
> > The devm_* functions eliminate the need for manual resource releasing and
> > simplify error handling.  Resources allocated by devm_* are freed
> > automatically on driver detach.
> > 
> > Signed-off-by: Hannu Heikkinen <hannuxx@iki.fi>
> > ---
> >  drivers/rtc/rtc-davinci.c | 56 +++++++++++++----------------------------------
> >  1 file changed, 15 insertions(+), 41 deletions(-)
> > 
> > diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
> > index 14c2109..d24b573 100644
> > --- a/drivers/rtc/rtc-davinci.c
> > +++ b/drivers/rtc/rtc-davinci.c
> > @@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
> >  struct davinci_rtc {
> >  	struct rtc_device 		*rtc;
> >  	void __iomem			*base;
> > -	resource_size_t			pbase;
> > -	size_t				base_size;
> >  	int				irq;
> >  };
> >  
> > @@ -482,22 +480,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> >  	struct davinci_rtc *davinci_rtc;
> > -	struct resource *res, *mem;
> > +	struct resource *res;
> >  	int ret = 0;
> >  
> > -	davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
> > +	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc),
> > +		GFP_KERNEL);
> >  	if (!davinci_rtc) {
> >  		dev_dbg(dev, "could not allocate memory for private data\n");
> >  		return -ENOMEM;
> >  	}
> >  
> > -	davinci_rtc->irq = platform_get_irq(pdev, 0);
> > -	if (davinci_rtc->irq < 0) {
> > -		dev_err(dev, "no RTC irq\n");
> > -		ret = davinci_rtc->irq;
> > -		goto fail1;
> > -	}
> > -
> >  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >  	if (!res) {
> >  		dev_err(dev, "no mem resource\n");
> > @@ -505,23 +497,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
> >  		goto fail1;
> 
> As mentioned last time, this will have a build break here because fail1
> is being removed down below.
> 
> Thanks,
> Sekhar

I'm sorry, did not spot that line before. Will fix.

br,
Hannu

[PATCH v3] rtc: davinci: clean up probe/remove routines

[Hannu Heikkinen]

Use the devres managed resource functions in the probe routine.
Also affects the remove routine where the previously used free and
release functions are not needed.

The devm_* functions eliminate the need for manual resource releasing and
simplify error handling.  Resources allocated by devm_* are freed
automatically on driver detach.

Signed-off-by: Hannu Heikkinen <hannuxx@iki.fi>
---
 drivers/rtc/rtc-davinci.c | 59 +++++++++++++----------------------------------
 1 file changed, 16 insertions(+), 43 deletions(-)

diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
index 14c2109..4a10b4b 100644
--- a/drivers/rtc/rtc-davinci.c
+++ b/drivers/rtc/rtc-davinci.c
@@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
 struct davinci_rtc {
 	struct rtc_device 		*rtc;
 	void __iomem			*base;
-	resource_size_t			pbase;
-	size_t				base_size;
 	int				irq;
 };
 
@@ -482,46 +480,32 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct davinci_rtc *davinci_rtc;
-	struct resource *res, *mem;
+	struct resource *res;
 	int ret = 0;
 
-	davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
+	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc),
+		GFP_KERNEL);
 	if (!davinci_rtc) {
 		dev_dbg(dev, "could not allocate memory for private data\n");
 		return -ENOMEM;
 	}
 
-	davinci_rtc->irq = platform_get_irq(pdev, 0);
-	if (davinci_rtc->irq < 0) {
-		dev_err(dev, "no RTC irq\n");
-		ret = davinci_rtc->irq;
-		goto fail1;
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "no mem resource\n");
-		ret = -EINVAL;
-		goto fail1;
+		return -EINVAL;
 	}
 
-	davinci_rtc->pbase = res->start;
-	davinci_rtc->base_size = resource_size(res);
-
-	mem = request_mem_region(davinci_rtc->pbase, davinci_rtc->base_size,
-				 pdev->name);
-	if (!mem) {
-		dev_err(dev, "RTC registers at %08x are not free\n",
-			davinci_rtc->pbase);
-		ret = -EBUSY;
-		goto fail1;
+	davinci_rtc->base = devm_request_and_ioremap(&pdev->dev, res);
+	if (!davinci_rtc->base) {
+		dev_err(&pdev->dev, "Unable to request mem region and grab IOs for device.\n");
+		return -EBUSY;
 	}
 
-	davinci_rtc->base = ioremap(davinci_rtc->pbase, davinci_rtc->base_size);
-	if (!davinci_rtc->base) {
-		dev_err(dev, "unable to ioremap MEM resource\n");
-		ret = -ENOMEM;
-		goto fail2;
+	davinci_rtc->irq = platform_get_irq(pdev, 0);
+	if (davinci_rtc->irq < 0) {
+		dev_err(dev, "no RTC irq\n");
+		return davinci_rtc->irq;
 	}
 
 	platform_set_drvdata(pdev, davinci_rtc);
@@ -529,9 +513,10 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 	davinci_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
 				    &davinci_rtc_ops, THIS_MODULE);
 	if (IS_ERR(davinci_rtc->rtc)) {
+		ret = PTR_ERR(davinci_rtc->rtc);
 		dev_err(dev, "unable to register RTC device, err %ld\n",
 				PTR_ERR(davinci_rtc->rtc));
-		goto fail3;
+		return ret;
 	}
 
 	rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
@@ -545,7 +530,7 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 			  0, "davinci_rtc", davinci_rtc);
 	if (ret < 0) {
 		dev_err(dev, "unable to register davinci RTC interrupt\n");
-		goto fail4;
+		goto err_dev_unreg;
 	}
 
 	/* Enable interrupts */
@@ -559,15 +544,8 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 
 	return 0;
 
-fail4:
+err_dev_unreg:
 	rtc_device_unregister(davinci_rtc->rtc);
-fail3:
-	platform_set_drvdata(pdev, NULL);
-	iounmap(davinci_rtc->base);
-fail2:
-	release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
-fail1:
-	kfree(davinci_rtc);
 
 	return ret;
 }
@@ -584,13 +562,8 @@ static int __devexit davinci_rtc_remove(struct platform_device *pdev)
 
 	rtc_device_unregister(davinci_rtc->rtc);
 
-	iounmap(davinci_rtc->base);
-	release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
-
 	platform_set_drvdata(pdev, NULL);
 
-	kfree(davinci_rtc);
-
 	return 0;
 }
 
-- 
1.7.12.2

Re: [PATCH v3] rtc: davinci: clean up probe/remove routines

[Hannu Heikkinen]

Hi,

Sekhar and others, any comments regarding this devm patch for Da Vinci?

br,
Hannu

On 14/10/12 17:03 +0300, Hannu Heikkinen wrote:
> Use the devres managed resource functions in the probe routine.
> Also affects the remove routine where the previously used free and
> release functions are not needed.
> 
> The devm_* functions eliminate the need for manual resource releasing and
> simplify error handling.  Resources allocated by devm_* are freed
> automatically on driver detach.
> 
> Signed-off-by: Hannu Heikkinen <hannuxx@iki.fi>
> ---
>  drivers/rtc/rtc-davinci.c | 59 +++++++++++++----------------------------------
>  1 file changed, 16 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
> index 14c2109..4a10b4b 100644
> --- a/drivers/rtc/rtc-davinci.c
> +++ b/drivers/rtc/rtc-davinci.c
> @@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
>  struct davinci_rtc {
>  	struct rtc_device 		*rtc;
>  	void __iomem			*base;
> -	resource_size_t			pbase;
> -	size_t				base_size;
>  	int				irq;
>  };
>  
> @@ -482,46 +480,32 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct davinci_rtc *davinci_rtc;
> -	struct resource *res, *mem;
> +	struct resource *res;
>  	int ret = 0;
>  
> -	davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
> +	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc),
> +		GFP_KERNEL);
>  	if (!davinci_rtc) {
>  		dev_dbg(dev, "could not allocate memory for private data\n");
>  		return -ENOMEM;
>  	}
>  
> -	davinci_rtc->irq = platform_get_irq(pdev, 0);
> -	if (davinci_rtc->irq < 0) {
> -		dev_err(dev, "no RTC irq\n");
> -		ret = davinci_rtc->irq;
> -		goto fail1;
> -	}
> -
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!res) {
>  		dev_err(dev, "no mem resource\n");
> -		ret = -EINVAL;
> -		goto fail1;
> +		return -EINVAL;
>  	}
>  
> -	davinci_rtc->pbase = res->start;
> -	davinci_rtc->base_size = resource_size(res);
> -
> -	mem = request_mem_region(davinci_rtc->pbase, davinci_rtc->base_size,
> -				 pdev->name);
> -	if (!mem) {
> -		dev_err(dev, "RTC registers at %08x are not free\n",
> -			davinci_rtc->pbase);
> -		ret = -EBUSY;
> -		goto fail1;
> +	davinci_rtc->base = devm_request_and_ioremap(&pdev->dev, res);
> +	if (!davinci_rtc->base) {
> +		dev_err(&pdev->dev, "Unable to request mem region and grab IOs for device.\n");
> +		return -EBUSY;
>  	}
>  
> -	davinci_rtc->base = ioremap(davinci_rtc->pbase, davinci_rtc->base_size);
> -	if (!davinci_rtc->base) {
> -		dev_err(dev, "unable to ioremap MEM resource\n");
> -		ret = -ENOMEM;
> -		goto fail2;
> +	davinci_rtc->irq = platform_get_irq(pdev, 0);
> +	if (davinci_rtc->irq < 0) {
> +		dev_err(dev, "no RTC irq\n");
> +		return davinci_rtc->irq;
>  	}
>  
>  	platform_set_drvdata(pdev, davinci_rtc);
> @@ -529,9 +513,10 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
>  	davinci_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
>  				    &davinci_rtc_ops, THIS_MODULE);
>  	if (IS_ERR(davinci_rtc->rtc)) {
> +		ret = PTR_ERR(davinci_rtc->rtc);
>  		dev_err(dev, "unable to register RTC device, err %ld\n",
>  				PTR_ERR(davinci_rtc->rtc));
> -		goto fail3;
> +		return ret;
>  	}
>  
>  	rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
> @@ -545,7 +530,7 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
>  			  0, "davinci_rtc", davinci_rtc);
>  	if (ret < 0) {
>  		dev_err(dev, "unable to register davinci RTC interrupt\n");
> -		goto fail4;
> +		goto err_dev_unreg;
>  	}
>  
>  	/* Enable interrupts */
> @@ -559,15 +544,8 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> -fail4:
> +err_dev_unreg:
>  	rtc_device_unregister(davinci_rtc->rtc);
> -fail3:
> -	platform_set_drvdata(pdev, NULL);
> -	iounmap(davinci_rtc->base);
> -fail2:
> -	release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
> -fail1:
> -	kfree(davinci_rtc);
>  
>  	return ret;
>  }
> @@ -584,13 +562,8 @@ static int __devexit davinci_rtc_remove(struct platform_device *pdev)
>  
>  	rtc_device_unregister(davinci_rtc->rtc);
>  
> -	iounmap(davinci_rtc->base);
> -	release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
> -
>  	platform_set_drvdata(pdev, NULL);
>  
> -	kfree(davinci_rtc);
> -
>  	return 0;
>  }
>  
> -- 
> 1.7.12.2
> 
> --
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-- 
-------------------------------------
Hannu Heikkinen
+358 45 8862828
hannuxx@iki.fi
PGP: BE4D3EEB
PGP Key fingerprint C450 D8F0 85D7 66DC D48E  58E1 6C9A 5ECE BE4D 3EEB
-------------------------------------