linux-kernel - Re: [PATCH 19/26] sh: Don't use create_proc_read

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Date:	Tue, 16 Apr 2013 15:11:13 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>,
	viro@...IV.linux.org.uk, linux-sh@...r.kernel.org
Subject: Re: [PATCH 19/26] sh: Don't use create_proc_read_entry() [RFC]

On Thu, Apr 11, 2013 at 02:30:09PM +0100, David Howells wrote:
> Don't use create_proc_read_entry() as that is deprecated, but rather use
> proc_create_data() and seq_file instead.

Paul, do you want me to handle this?

> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Paul Mundt <lethal@...ux-sh.org>
> cc: linux-sh@...r.kernel.org
> ---
> 
>  arch/sh/drivers/dma/dma-api.c |   28 +++++++++++++++++++---------
>  1 file changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/sh/drivers/dma/dma-api.c b/arch/sh/drivers/dma/dma-api.c
> index f46848f..851e510 100644
> --- a/arch/sh/drivers/dma/dma-api.c
> +++ b/arch/sh/drivers/dma/dma-api.c
> @@ -13,6 +13,7 @@
>  #include <linux/module.h>
>  #include <linux/spinlock.h>
>  #include <linux/proc_fs.h>
> +#include <linux/seq_file.h>
>  #include <linux/list.h>
>  #include <linux/platform_device.h>
>  #include <linux/mm.h>
> @@ -308,11 +309,9 @@ int dma_extend(unsigned int chan, unsigned long op, void *param)
>  }
>  EXPORT_SYMBOL(dma_extend);
>  
> -static int dma_read_proc(char *buf, char **start, off_t off,
> -			 int len, int *eof, void *data)
> +static int dma_proc_show(struct seq_file *m, void *v)
>  {
> -	struct dma_info *info;
> -	char *p = buf;
> +	struct dma_info *info = v;
>  
>  	if (list_empty(&registered_dmac_list))
>  		return 0;
> @@ -332,14 +331,26 @@ static int dma_read_proc(char *buf, char **start, off_t off,
>  			if (!(channel->flags & DMA_CONFIGURED))
>  				continue;
>  
> -			p += sprintf(p, "%2d: %14s    %s\n", i,
> -				     info->name, channel->dev_id);
> +			seq_printf(m, "%2d: %14s    %s\n", i,
> +				   info->name, channel->dev_id);
>  		}
>  	}
>  
> -	return p - buf;
> +	return 0;
> +}
> +
> +static int dma_proc_open(struct inode *inode, struct file *file)
> +{
> +	return single_open(file, dma_proc_show, NULL);
>  }
>  
> +static const struct file_operations dma_proc_fops = {
> +	.open		= dma_proc_open,
> +	.read		= seq_read,
> +	.llseek		= seq_lseek,
> +	.release	= seq_release,
> +};
> +
>  int register_dmac(struct dma_info *info)
>  {
>  	unsigned int total_channels, i;
> @@ -412,8 +423,7 @@ EXPORT_SYMBOL(unregister_dmac);
>  static int __init dma_api_init(void)
>  {
>  	printk(KERN_NOTICE "DMA: Registering DMA API.\n");
> -	return create_proc_read_entry("dma", 0, 0, dma_read_proc, 0)
> -		    ? 0 : -ENOMEM;
> +	return proc_create("dma", 0, NULL, &dma_proc_fops) ? 0 : -ENOMEM;
>  }
>  subsys_initcall(dma_api_init);
>  
> 
> --
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