linux-kernel - Re: [PATCH RFC v3 2/3] i2c: pxa: convert to devm

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Date:	Fri, 24 May 2013 11:35:24 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Libo Chen <libo.chen@...wei.com>
CC:	wsa@...-dreams.de, sonic.zhang@...log.com,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	lizefan@...wei.com
Subject: Re: [PATCH RFC v3 2/3] i2c: pxa: convert to devm_* API

Hi Libo,
   I think you can merge patch 1/3 and 2/3, they do the same thing that using  devm_* API to simplify
and make the code clean, and the additional goal is it also can fix a bug. Besides, maybe you need to
change the title and make it clear and self-described.

Thanks,
Gu

On 05/23/2013 08:00 PM, Libo Chen wrote:

> when i2c malloc faild, we should not try to call release_mem_region.
> aovid this, convert them to devm_* API.
> 
> Signed-off-by: Libo Chen <libo.chen@...wei.com>
> ---
>  drivers/i2c/busses/i2c-pxa.c |   63 ++++++++++--------------------------------
>  1 files changed, 15 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
> index ea6d45d..7b10102 100644
> --- a/drivers/i2c/busses/i2c-pxa.c
> +++ b/drivers/i2c/busses/i2c-pxa.c
> @@ -1091,10 +1091,9 @@ static int i2c_pxa_probe(struct platform_device *dev)
>  	struct resource *res = NULL;
>  	int ret, irq;
>  
> -	i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
> +	i2c = devm_kzalloc(&dev->dev, sizeof(struct pxa_i2c), GFP_KERNEL);
>  	if (!i2c) {
> -		ret = -ENOMEM;
> -		goto emalloc;
> +		return -ENOMEM;
>  	}


The {} pair is no longer needed.

>  
>  	/* Default adapter num to device id; i2c_pxa_probe_dt can override. */
> @@ -1104,19 +1103,11 @@ static int i2c_pxa_probe(struct platform_device *dev)
>  	if (ret > 0)
>  		ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
>  	if (ret < 0)
> -		goto eclk;
> +		return ret;
>  
> -	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
>  	irq = platform_get_irq(dev, 0);
> -	if (res == NULL || irq < 0) {
> -		ret = -ENODEV;
> -		goto eclk;
> -	}
> -
> -	if (!request_mem_region(res->start, resource_size(res), res->name)) {
> -		ret = -ENOMEM;
> -		goto eclk;
> -	}
> +	if (irq < 0)
> +		return -ENODEV;
>  
>  	i2c->adap.owner   = THIS_MODULE;
>  	i2c->adap.retries = 5;
> @@ -1126,17 +1117,15 @@ static int i2c_pxa_probe(struct platform_device *dev)
>  
>  	strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
>  
> -	i2c->clk = clk_get(&dev->dev, NULL);
> +	i2c->clk = devm_clk_get(&dev->dev, NULL);
>  	if (IS_ERR(i2c->clk)) {
> -		ret = PTR_ERR(i2c->clk);
> -		goto eclk;
> +		return PTR_ERR(i2c->clk);
>  	}

the same.

>  
> -	i2c->reg_base = ioremap(res->start, resource_size(res));
> -	if (!i2c->reg_base) {
> -		ret = -EIO;
> -		goto eremap;
> -	}
> +	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
> +	i2c->reg_base = devm_ioremap_resource(&dev->dev, res);
> +	if (IS_ERR(i2c->reg_base))
> +		return PTR_ERR(i2c->reg_bas);
>  
>  	i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr;
>  	i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr;
> @@ -1166,10 +1155,10 @@ static int i2c_pxa_probe(struct platform_device *dev)
>  		i2c->adap.algo = &i2c_pxa_pio_algorithm;
>  	} else {
>  		i2c->adap.algo = &i2c_pxa_algorithm;
> -		ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED,
> -				  dev_name(&dev->dev), i2c);
> +		ret = devm_request_irq(&dev->dev, irq, i2c_pxa_handler,
> +					IRQF_SHARED, dev_name(&dev->dev), i2c);
>  		if (ret)
> -			goto ereqirq;
> +			return ret;
>  	}
>  
>  	i2c_pxa_reset(i2c);
> @@ -1183,7 +1172,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
>  	ret = i2c_add_numbered_adapter(&i2c->adap);
>  	if (ret < 0) {
>  		printk(KERN_INFO "I2C: Failed to add bus\n");
> -		goto eadapt;
> +		return ret;
>  	}
>  	of_i2c_register_devices(&i2c->adap);
>  
> @@ -1198,19 +1187,6 @@ static int i2c_pxa_probe(struct platform_device *dev)
>  #endif
>  	return 0;
>  
> -eadapt:
> -	if (!i2c->use_pio)
> -		free_irq(irq, i2c);
> -ereqirq:
> -	clk_disable(i2c->clk);
> -	iounmap(i2c->reg_base);
> -eremap:
> -	clk_put(i2c->clk);
> -eclk:
> -	kfree(i2c);
> -emalloc:
> -	release_mem_region(res->start, resource_size(res));
> -	return ret;
>  }
>  
>  static int i2c_pxa_remove(struct platform_device *dev)
> @@ -1218,15 +1194,6 @@ static int i2c_pxa_remove(struct platform_device *dev)
>  	struct pxa_i2c *i2c = platform_get_drvdata(dev);
>  
>  	i2c_del_adapter(&i2c->adap);
> -	if (!i2c->use_pio)
> -		free_irq(i2c->irq, i2c);
> -
> -	clk_disable(i2c->clk);
> -	clk_put(i2c->clk);
> -
> -	iounmap(i2c->reg_base);
> -	release_mem_region(i2c->iobase, i2c->iosize);
> -	kfree(i2c);
>  
>  	return 0;
>  }


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