From: Ville Syrjala <syrjala@sci.fi>
Date: Thu, 15 Mar 2012 17:11:05 +0000 (+0100)
Subject: i2c-algo-bit: Fix spurious SCL timeouts under heavy load
X-Git-Tag: v3.2.12~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=883eb9633dcc5d3cc2389110508805d1d80c9d09;p=pandora-kernel.git

i2c-algo-bit: Fix spurious SCL timeouts under heavy load

commit 8ee161ce5e0cfc689eb677f227a6248191165fac upstream.

When the system is under heavy load, there can be a significant delay
between the getscl() and time_after() calls inside sclhi(). That delay
may cause the time_after() check to trigger after SCL has gone high,
causing sclhi() to return -ETIMEDOUT.

To fix the problem, double check that SCL is still low after the
timeout has been reached, before deciding to return -ETIMEDOUT.

Signed-off-by: Ville Syrjala <syrjala@sci.fi>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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