linux-kernel - Re: [PATCH 6/7] debugfs: Fix misuse of seq

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Date:	Tue, 28 Oct 2014 10:58:31 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>, Petr Mladek <pmladek@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] debugfs: Fix misuse of seq_printf return value

On Mon, 29 Sep 2014 16:08:26 -0700
Joe Perches <joe@...ches.com> wrote:

> Adding repeated -1 to the return is not correct.
> 
> Use seq_is_full to test for unnecessary seq_printf uses
> and always return 0.

Actually, debugfs_print_regs32() should return void as well.
I'll update that.

Thanks,

-- Steve

> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  fs/debugfs/file.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
> index 76c08c2..c24e578 100644
> --- a/fs/debugfs/file.c
> +++ b/fs/debugfs/file.c
> @@ -695,15 +695,17 @@ EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
>  int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
>  			   int nregs, void __iomem *base, char *prefix)
>  {
> -	int i, ret = 0;
> +	int i;
>  
>  	for (i = 0; i < nregs; i++, regs++) {
> -		if (prefix)
> -			ret += seq_printf(s, "%s", prefix);
> -		ret += seq_printf(s, "%s = 0x%08x\n", regs->name,
> -				  readl(base + regs->offset));
> +		seq_printf(s, "%s%s = 0x%08x\n",
> +			   prefix ? prefix : "",
> +			   regs->name, readl(base + regs->offset));
> +		if (seq_is_full(s))
> +			break;
>  	}
> -	return ret;
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL_GPL(debugfs_print_regs32);
>  

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