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

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Date:	Tue, 26 Jan 2010 07:29:24 -0800
From:	Greg KH <greg@...ah.com>
To:	Himanshu Chauhan <hschauhan@...ltrace.org>
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 Tue, Jan 26, 2010 at 12:01:27PM +0530, Himanshu Chauhan wrote:
> 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.

Then it needs to be fixed.  Again, it must be, one value per file, that
is the sysfs rule.

> 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.

That would be great.

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

They are in my "to-apply" queue that I will be flushing out in the next
few days.

thanks,

greg k-h
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