From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Subject: Re: Serial Core crash in tty_open
Date: Wed, 28 May 2014 07:37:26 -0700
Message-ID: <20140528143726.GD24698@kroah.com>
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To: Abhijit Lamsoge <abhijitelinux@gmail.com>
Cc: linux-serial@vger.kernel.org

On Wed, May 28, 2014 at 02:34:07PM +0530, Abhijit Lamsoge wrote:
> Hi All,
> Crash Starts here.
> 
>  1498.722292] ------------[ cut here ]------------
> [ 1498.722305] WARNING: CPU: 3 PID: 5029 at
> /build/buildd/linux-3.13.0/drivers/tty/tty_io.c:1474
> tty_init_dev+0x1d0/0x1e0()
> [ 1498.722308] tty_init_dev:  driver does not set tty->port. This will
> crash the kernel later. Fix the driver!

Doesn't this explain the issue well enough?