usb/103046: [patch] ulpt event driven I/O with select(2) and nonblock

[Jan-Espen Pettersen]

The following reply was made to PR usb/103046; it has been noted by GNATS.

From: Jan-Espen Pettersen <sigsegv at leakingmemory.org>
To: bug-followup at FreeBSD.org, sigsegv at radiotube.org
Cc:  
Subject: Re: usb/103046: [patch] ulpt event driven I/O with select(2) and
 nonblock
Date: Sat, 09 Sep 2006 19:42:11 +0200

 I've updated the patch as I spotted errors in the original patch.
 The url will still be http://www.radiotube.org/ulpt_poll.diff
 
 Fixes were:
 * Forgot to start transfer (in other words forgot to call usbd_transfer)
 for the background read.
 * Panic in read callback at pipe abort.
 
 What I am interested to know about is how this works with printers that
 actually do return any backchannel data, since my dumb laser printer does=
 
 not return data at all.
 
 Jan-Espen Pettersen