danukeru authored Aug 24, 2019 and rahix committed Aug 24, 2019

Previously, race-conditions between multiple serial writes could lead to
memory corruption and weird artifacts like I2C getting stuck.  This
patch introduces a write-streambuffer which queues all messages.

Co-authored-by: Rahix <rahix@rahix.de>
Signed-off-by: danukeru <danukeru@foulab.org>