Hi Benjamin,

I found out what was wrong in the change that you've provided:

On 12.05.2017 16:28, Benjamin Tissoires wrote:
 >>
 >>     + if (td->mtclass.quirks & MT_QUIRK_STICKY_FINGERS) + 
mod_timer(&td->release_timer, msecs_to_jiffies(250)); }
Should be:
mod_timer(&td->release_timer, jiffies + msecs_to_jiffies(100));

Delay should be added to current jiffies value. Also I found out that 
250 ms is too long delay - xserver recognize such a delay as a drag 
gesture. Using 100 ms everything works perfectly!

What do you think that should be changed more in the patch to make it 
ready for being submitted as an official patch? I thought about some 
unit tests, but can't find any for hid drivers also I don't know how to 
mock timers.

One more time, thank you for your support!

Cheers, Arek