linux-kernel - Re: tty TTY

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Message-ID: <20111223204015.541924f2@pyx>
Date:	Fri, 23 Dec 2011 20:40:15 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	markh@...pro.net
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>,
	Mark Hounschell <dmarkh@....rr.com>
Subject: Re: tty  TTY_HUPPED anomaly


> I turned the TTY_DEBUG_HANGUP and added some additional printks. You see 
> below the first port works just fine but the second fails because 
> something is calling the tty_hangup function around 70usecs after I open 
> the device???
> What and Why???

The driver will be - and because the carrier dropped and the HUPCL flag
is set on the port.

Alan
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