Message-ID: <1389113497.2735.142.camel@acox1-desk.ger.corp.intel.com>
Subject: Re: [RFC DO NOT MERGE] tty: n_gsm: support buggy modem
From: Alan Cox <alan@linux.intel.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Lars Poeschel <poeschel@lemonage.de>, jslaby@suse.cz,
        linux-kernel@vger.kernel.org, xiaojin <jin.xiao@intel.com>,
        Ken Mills <ken.k.mills@intel.com>,
        Dirkjan Bussink <d.bussink@gmail.com>
Date: Tue, 07 Jan 2014 16:51:37 +0000
In-Reply-To: <20140107142050.GB32491@kroah.com>
References: <4386658.RncifLMAGy@lem-wkst-02>
	 <20140107142050.GB32491@kroah.com>
Organization: Intel Corporation
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org

> > 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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