linux-kernel - rts5139 polling overhead...

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Message-ID: <CAMVG2su47PegSW75aGomPP_6ot86suks9o29MiFEvneY4mTgyQ@mail.gmail.com>
Date:	Mon, 6 Aug 2012 22:31:09 +0800
From:	Daniel J Blueman <daniel@...ra.org>
To:	edwin_rong <edwin_rong@...lsil.com.cn>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	wei_wang@...lsil.com.cn
Subject: rts5139 polling overhead...

Hi Edwin,

The Realsil/Realtek rts5139 card reader driver polls it's hardware at
20Hz and has racked up 25 minutes of processor time over a few days on
this Sandy Bridge media centre box, without any cards inserted. This
is more than the sum of all the other processes (including X):

$ ps -ef | grep rts5139
root       691     2  0 Aug03 ?        00:00:36 [rts5139-control]
root       693     2  0 Aug03 ?        00:25:36 [rts5139-polling]

The kernel is stock 3.5.0 without debug; would it help if I log a bug
report or eg collect further detail?

Thanks,
  Daniel
-- 
Daniel J Blueman
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