usb/149675: uftdi doesn't react to break properly

[Ed Schouten]

The following reply was made to PR usb/149675; it has been noted by GNATS.

From: Ed Schouten <ed at 80386.nl>
To: bug-followup at FreeBSD.org, prt at prt.org, hselasky at c2i.net
Cc:  
Subject: Re: usb/149675: uftdi doesn't react to break properly
Date: Sun, 15 Aug 2010 18:02:40 +0200

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 Hans, Paul,
 
 I just looked at the usb_serial.c source code and it seems break/parity
 conditions are never propagated to the TTY layer:
 
 	if (ttydisc_rint(tp, buf[cnt], 0) =3D=3D -1) {
 
 The third argument is supposed to be a bitmask of TRE_FRAMING,
 TRE_PARITY, TRE_OVERRUN and TRE_BREAK, to indicate the type of
 transmission error/condition.
 
 This is why breaks are probably just received as zero-bytes.
 
 --=20
  Ed Schouten <ed at 80386.nl>
  WWW: http://80386.nl/
 
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