From: Mikhail Kshevetskiy <mikhail.kshevetskiy@gmail.com>
Date: Sun, 27 Mar 2011 00:05:00 +0000 (+0400)
Subject: tty/n_gsm: fix bug in CRC calculation for gsm1 mode
X-Git-Tag: v2.6.39-rc5~19^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9db4e4381a8e881ff65a5d3400bfa471f84217e7;p=pandora-kernel.git

tty/n_gsm: fix bug in CRC calculation for gsm1 mode

Problem description:
  gsm_queue() calculate a CRC for arrived frames. As a last step of
  CRC calculation it call

    gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->received_fcs);

  This work perfectly for the case of GSM0 mode as gsm->received_fcs
  contain the last piece of data required to generate final CRC.

  gsm->received_fcs is not used for GSM1 mode. Thus we put an
  additional byte to CRC calculation. As result we get a wrong CRC
  and reject incoming frame.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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