diff options
| author | Chase Douglas <chase.douglas@canonical.com> | 2012-02-02 13:19:15 -0800 |
|---|---|---|
| committer | Peter Hutterer <peter.hutterer@who-t.net> | 2012-02-06 23:51:54 +1000 |
| commit | dfdcf8b34363ed2504347d00957a3606f82c0b0d (patch) | |
| tree | 6024175e953b38b24b669e0d06b812e9d2a4586c | |
| parent | 782c7fb6fe20ed21b02808096de12d3cbf1afc8b (diff) | |
Ensure delta computation does not go crazy
I have seen this a couple times, but I haven't been able to catch it
when it starts. It's a feedback loop, so once you miss the entrance of
the loop, you can't see what really went wrong.
This patch papers over the issue for now.
Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
| -rw-r--r-- | src/synaptics.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/synaptics.c b/src/synaptics.c index a455b6f..181e88a 100644 --- a/src/synaptics.c +++ b/src/synaptics.c @@ -1974,6 +1974,14 @@ get_delta(SynapticsPrivate *priv, const struct SynapticsHwState *hw, /* report edge speed as synthetic motion. Of course, it would be * cooler to report floats than to buffer, but anyway. */ + + /* FIXME: When these values go NaN, bad things happen. Root cause is unknown + * thus far though. */ + if (isnan(priv->frac_x)) + priv->frac_x = 0; + if (isnan(priv->frac_y)) + priv->frac_y = 0; + tmpf = *dx + x_edge_speed * dtime + priv->frac_x; priv->frac_x = modf(tmpf, &integral); *dx = integral; |