linux-kernel - Re: [RFC DO NOT MERGE] tty: n

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Date:	Tue, 07 Jan 2014 16:51:37 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Lars Poeschel <poeschel@...onage.de>, jslaby@...e.cz,
	linux-kernel@...r.kernel.org, xiaojin <jin.xiao@...el.com>,
	Ken Mills <ken.k.mills@...el.com>,
	Dirkjan Bussink <d.bussink@...il.com>
Subject: Re: [RFC DO NOT MERGE] tty: n_gsm: support buggy modem

> > modem status command, but this DV bit is not set. With this patch the modem
> > and the whole mux is working fine. Another way makeing all this work is
> > setting the carrier_raised function to NULL. The tty code assumes that
> > everything is alright then.

Which means your modem has decided it doesn't yet have a carrier. Do you
get a carrier after ATD completes with a CONNECTED message ?

(you can open with O_NDELAY to avoid blocking on the open)

Alan


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