linux-kernel - Re: [PATCH] i2c-iop3xx: add iomem annotation

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Message-ID: <20101203015914.GC20097@trinity.fluff.org>
Date:	Fri, 3 Dec 2010 01:59:14 +0000
From:	Ben Dooks <ben-i2c@...ff.org>
To:	Aaro Koskinen <aaro.koskinen@....fi>
Cc:	ben-linux@...ff.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c-iop3xx: add iomem annotation

On Sun, Nov 28, 2010 at 06:07:00PM +0200, Aaro Koskinen wrote:
> Eliminate unnecessary casts and the following sparse warnings:
> 
> 	drivers/i2c/busses/i2c-iop3xx.c:65:9: warning: incorrect type in argument 1 (different base types)
> 	drivers/i2c/busses/i2c-iop3xx.c:65:9:    expected void const volatile [noderef] <asn:2>*<noident>
> 	drivers/i2c/busses/i2c-iop3xx.c:65:9:    got unsigned int
> 
> 	[ the previous warning is repeated 18 times ]
> 
> 	drivers/i2c/busses/i2c-iop3xx.c:456:33: warning: cast removes address space of expression
> 
> Signed-off-by: Aaro Koskinen <aaro.koskinen@....fi>
> ---
>  drivers/i2c/busses/i2c-iop3xx.c |    6 +++---
>  drivers/i2c/busses/i2c-iop3xx.h |    2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c
> index 112c61f..f09c931 100644
> --- a/drivers/i2c/busses/i2c-iop3xx.c
> +++ b/drivers/i2c/busses/i2c-iop3xx.c
> @@ -409,7 +409,7 @@ iop3xx_i2c_remove(struct platform_device *pdev)
>  		IOP3XX_ICR_RXFULL_IE | IOP3XX_ICR_TXEMPTY_IE);
>  	__raw_writel(cr, adapter_data->ioaddr + CR_OFFSET);
>  
> -	iounmap((void __iomem*)adapter_data->ioaddr);
> +	iounmap(adapter_data->ioaddr);
>  	release_mem_region(res->start, IOP3XX_I2C_IO_SIZE);
>  	kfree(adapter_data);
>  	kfree(padapter);
> @@ -453,7 +453,7 @@ iop3xx_i2c_probe(struct platform_device *pdev)
>  	/* set the adapter enumeration # */
>  	adapter_data->id = i2c_id++;
>  
> -	adapter_data->ioaddr = (u32)ioremap(res->start, IOP3XX_I2C_IO_SIZE);
> +	adapter_data->ioaddr = ioremap(res->start, IOP3XX_I2C_IO_SIZE);
>  	if (!adapter_data->ioaddr) {
>  		ret = -ENOMEM;
>  		goto release_region;
> @@ -498,7 +498,7 @@ iop3xx_i2c_probe(struct platform_device *pdev)
>  	return 0;
>  
>  unmap:
> -	iounmap((void __iomem*)adapter_data->ioaddr);
> +	iounmap(adapter_data->ioaddr);
>  
>  release_region:
>  	release_mem_region(res->start, IOP3XX_I2C_IO_SIZE);
> diff --git a/drivers/i2c/busses/i2c-iop3xx.h b/drivers/i2c/busses/i2c-iop3xx.h
> index 8485861..a63b9f1 100644
> --- a/drivers/i2c/busses/i2c-iop3xx.h
> +++ b/drivers/i2c/busses/i2c-iop3xx.h
> @@ -97,7 +97,7 @@
>  #define	IOP3XX_I2C_IO_SIZE	0x18
>  
>  struct i2c_algo_iop3xx_data {
> -	u32 ioaddr;
> +	char __iomem *ioaddr;

probably should be changed to void if possible without creating extra
warnings.

-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.

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