linux-kernel - Re: sysfs_ops show vector: size of buffer not required?

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Message-ID: <20100126063127.GA2369@himanshu-laptop>
Date:	Tue, 26 Jan 2010 12:01:27 +0530
From:	Himanshu Chauhan <hschauhan@...ltrace.org>
To:	Greg KH <greg@...ah.com>
Cc:	Himanshu Chauhan <himanshu@...metricore.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Kernel Newbies <kernelnewbies@...linux.org>
Subject: Re: sysfs_ops show vector: size of buffer not required?

On Mon, Jan 25, 2010 at 08:36:46PM -0800, Greg KH wrote:
> On Sun, Jan 24, 2010 at 01:11:18PM +0530, Himanshu Chauhan wrote:
> > Hi All,
> > 
> > The sysfs_ops's show vector doesn't have a size of the
> > buffer given to the vector, while store on the other hand
> > has. What is the rationale behind it?
> 
> If you need to check the size, you are doing something wrong.
> 
> Seriously, that is the reason.  A sysfs file should be a single value,
> which will never overflow the buffer.
> 
I was talking in context of usb/ip's show_status. It writes a lot of data
into this buffer. Which seems to over flow the buffer. But anyways, I
will check if it can be reduced or at least be splitted into differnt
device attributes.

BTW, Greg, Did you take a look at other patches I had sent? Are are worth or
I need rework?

Regards
Himanshu
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