linux-kernel - Re: [PATCH] Input: atmel_mxt_ts - Use snprintf for sysfs attribute show method

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Date:	Thu, 06 Oct 2011 10:59:23 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Daniel Kurtz <djkurtz@...omium.org>
CC:	Joonyoung Shim <jy0922.shim@...sung.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Iiro Valkonen <iiro.valkonen@...el.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Yufeng Shen <miletus@...omium.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: atmel_mxt_ts - Use snprintf for sysfs attribute
 show method

Hi Daniel-

Just to introduce myself, I'm working for Atmel in UK on the 
atmel_mxt_ts driver.

Daniel Kurtz wrote:
 > Sysfs attribute show methods are always passed a buffer of length
 > PAGE_SIZE.  To keep from overwriting this buffer and causing havoc,
 > use snprintf() to guarantee we never write more than the buffer can
 > hold.
 >
 > In addition, at least for my touchscreen, the number and size of
 > objects was far too big to fit in a single 4K page.  Therefore, this
 > patch also trims some redundant framing text to leave more room for
 > actual data.

Yes, I'd noticed this problem as well. I was planning to address it by 
splitting up the file, but your patch looks like a good solution for now.

I've tested it successfully on several chips.

Acked-by: Nick Dyer <nick.dyer@...ev.co.uk>

-- 
Nick Dyer
Software Engineer, ITDev  Ltd

Hardware and Software Development Consultancy

Email:   nick.dyer@...ev.co.uk
Website: http://www.itdev.co.uk
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