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authorVille Syrjala <syrjala@sci.fi>2012-03-15 18:11:05 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-03-19 08:57:59 -0700
commit35f68010b4311eacf6340473b062418715d68a39 (patch)
treecb482f2b882598f145a2643bbee9e9e20ddfbbcd /Makefile
parent90b7d65c8cba8830ede8307a21a76c8757eefa3a (diff)
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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