Marcel,

Previous patch broken up into two:

rfcomm-tty-keep-socket-data:
If the TTY socket receives data before TTY is created, or the TTY is not 
opened (e.g. on devfs) then the data is discarded.  This makes it impossible 
to support some protocols which send data right away, e.g. DUN and HFP

This one should be applied first.

rfcomm-tty-echo-overflow:
The serial core sends us lots of 1 byte requests when dealing with 
canonical ttys (e.g. ones that echo).  This attempts to fix this issue by 
tweaking how the wfree is handled and also tries to be intelligent in the 
handling these 1 byte requests by appending them to the pending packet if 
there is room.  

-Denis