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

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Date:	Tue, 26 Jan 2010 22:40:14 +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 Tue, Jan 26, 2010 at 07:29:24AM -0800, Greg KH wrote:
> 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.

Okay, I will do that.

> 
> > 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.

Regards
Himanshu
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