diff options
| author | Ville Syrjala <syrjala@sci.fi> | 2012-03-15 13:11:05 -0400 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2012-03-26 05:27:07 -0400 |
| commit | 64b96140e4d33bb464305ff8beb2880e12c92bdc (patch) | |
| tree | 7fceada6a8fd5f011bd817344f1713a098de94dd /scripts | |
| parent | b9e24519ea78d06dd67046ff26e1d696b069b1ec (diff) | |
i2c-algo-bit: Fix spurious SCL timeouts under heavy load
BugLink: http://bugs.launchpad.net/bugs/959470
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>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions