linux-kernel - Re: [Xen-devel] [PATCH 2/2] xen/xenbus: don't reimplement kvasprintf via a fixed size buffer

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Date:	Wed, 04 Jan 2012 11:58:56 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Ian Campbell" <ian.campbell@...rix.com>
Cc:	"Haogang Chen" <haogangchen@...il.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	<virtualization@...ts.linux-foundation.org>,
	<xen-devel@...ts.xensource.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/2] xen/xenbus: don't reimplement
 kvasprintf via a fixed size buffer

>>> On 04.01.12 at 12:39, Ian Campbell <ian.campbell@...rix.com> wrote:
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>

Acked-by: Jan Beulich <jbeulich@...e.com>

> Cc: Haogang Chen <haogangchen@...il.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: xen-devel@...ts.xensource.com 
> Cc: virtualization@...ts.linux-foundation.org 
> Cc: linux-kernel@...r.kernel.org 
> ---
>  drivers/xen/xenbus/xenbus_xs.c |   17 +++++++----------
>  1 files changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
> index 6f0121e..226d1ac 100644
> --- a/drivers/xen/xenbus/xenbus_xs.c
> +++ b/drivers/xen/xenbus/xenbus_xs.c
> @@ -532,21 +532,18 @@ int xenbus_printf(struct xenbus_transaction t,
>  {
>  	va_list ap;
>  	int ret;
> -#define PRINTF_BUFFER_SIZE 4096
> -	char *printf_buffer;
> -
> -	printf_buffer = kmalloc(PRINTF_BUFFER_SIZE, GFP_NOIO | __GFP_HIGH);
> -	if (printf_buffer == NULL)
> -		return -ENOMEM;
> +	char *buf;
>  
>  	va_start(ap, fmt);
> -	ret = vsnprintf(printf_buffer, PRINTF_BUFFER_SIZE, fmt, ap);
> +	buf = kvasprintf(GFP_NOIO | __GFP_HIGH, fmt, ap);
>  	va_end(ap);
>  
> -	BUG_ON(ret > PRINTF_BUFFER_SIZE-1);
> -	ret = xenbus_write(t, dir, node, printf_buffer);
> +	if (!buf)
> +		return -ENOMEM;
> +
> +	ret = xenbus_write(t, dir, node, buf);
>  
> -	kfree(printf_buffer);
> +	kfree(buf);
>  
>  	return ret;
>  }
> -- 
> 1.7.2.5
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xensource.com 
> http://lists.xensource.com/xen-devel 



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