From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ad419cd19f59ede0739d39e840a70e12@hamnavoe.com>
To: 9fans@9fans.net
From: Richard Miller <9fans@hamnavoe.com>
Date: Wed, 14 Dec 2016 10:44:03 +0000
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Subject: Re: [9fans] usb serial on raspberry pi (again)
Topicbox-Message-UUID: b1068414-ead9-11e9-9d60-3106f5b1d025

> Maybe it's as simple
> as having separate read and write QLocks.

For normal endpoints it is that simple.  Control endpoints, however,
are bidirectional but effectively half-duplex, so reads and writes
still need to be locked against each other.

Today's version of /n/sources/contrib/miller/9/bcm/usbdwc.c should
do the right things.