commit: f086ced17191fa0c5712539d2b680eae3dc972a1
From: "Du, Alek" <[email protected]>
Date: Thu, 7 Jul 2011 15:16:48 +0100
Subject: [PATCH] n_gsm: fix the wrong FCS handling

FCS could be GSM0_SOF, so will break state machine...

[This byte isn't quoted in any way so a SOF here doesn't imply an error
 occurred.]

Signed-off-by: Alek Du <[email protected]>
Signed-off-by: Alan Cox <[email protected]>
Cc: stable <[email protected]> [3.0]

[Trivial but best backported once its in 3.1rc I think]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 drivers/tty/n_gsm.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index a38114b..14522ee 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1871,10 +1871,6 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned 
char c)
                break;
        case GSM_FCS:           /* FCS follows the packet */
                gsm->received_fcs = c;
-               if (c == GSM0_SOF) {
-                       gsm->state = GSM_SEARCH;
-                       break;
-               }
                gsm_queue(gsm);
                gsm->state = GSM_SSOF;
                break;

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