From c2f2f0000bb69f067fea12624272e6a58a811702 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Thu, 4 Nov 2010 15:17:03 +0000 Subject: [PATCH] n_gsm: Fix support for legacy encoding The mux supports several encoding schemes. Encoding 0 is a "not recommended" mode still sometimes used. This has now been tested with hardware that supports this mode, and found wanting. Fix the FCS handling in this mode and correct the state machine. Signed-off-by: Ken Mills Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_gsm.c | 59 +++++++++++++++++++++++++++++++++++---------- 1 file changed, 46 insertions(+), 13 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 04ef3ef0a422..5256087dd81b 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -184,6 +184,9 @@ struct gsm_mux { #define GSM_DATA 5 #define GSM_FCS 6 #define GSM_OVERRUN 7 +#define GSM_LEN0 8 +#define GSM_LEN1 9 +#define GSM_SSOF 10 unsigned int len; unsigned int address; unsigned int count; @@ -191,6 +194,7 @@ struct gsm_mux { int encoding; u8 control; u8 fcs; + u8 received_fcs; u8 *txframe; /* TX framing buffer */ /* Methods for the receiver side */ @@ -1623,7 +1627,6 @@ static void gsm_dlci_free(struct gsm_dlci *dlci) kfree(dlci); } - /* * LAPBish link layer logic */ @@ -1648,6 +1651,8 @@ static void gsm_queue(struct gsm_mux *gsm) if ((gsm->control & ~PF) == UI) gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->len); + /* generate final CRC with received FCS */ + gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->received_fcs); if (gsm->fcs != GOOD_FCS) { gsm->bad_fcs++; if (debug & 4) @@ -1746,6 +1751,8 @@ invalid: static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) { + unsigned int len; + switch (gsm->state) { case GSM_SEARCH: /* SOF marker */ if (c == GSM0_SOF) { @@ -1754,8 +1761,8 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) gsm->len = 0; gsm->fcs = INIT_FCS; } - break; /* Address EA */ - case GSM_ADDRESS: + break; + case GSM_ADDRESS: /* Address EA */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); if (gsm_read_ea(&gsm->address, c)) gsm->state = GSM_CONTROL; @@ -1763,9 +1770,9 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) case GSM_CONTROL: /* Control Byte */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); gsm->control = c; - gsm->state = GSM_LEN; + gsm->state = GSM_LEN0; break; - case GSM_LEN: /* Length EA */ + case GSM_LEN0: /* Length EA */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); if (gsm_read_ea(&gsm->len, c)) { if (gsm->len > gsm->mru) { @@ -1774,8 +1781,28 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) break; } gsm->count = 0; - gsm->state = GSM_DATA; + if (!gsm->len) + gsm->state = GSM_FCS; + else + gsm->state = GSM_DATA; + break; } + gsm->state = GSM_LEN1; + break; + case GSM_LEN1: + gsm->fcs = gsm_fcs_add(gsm->fcs, c); + len = c; + gsm->len |= len << 7; + if (gsm->len > gsm->mru) { + gsm->bad_size++; + gsm->state = GSM_SEARCH; + break; + } + gsm->count = 0; + if (!gsm->len) + gsm->state = GSM_FCS; + else + gsm->state = GSM_DATA; break; case GSM_DATA: /* Data */ gsm->buf[gsm->count++] = c; @@ -1783,16 +1810,25 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) gsm->state = GSM_FCS; break; case GSM_FCS: /* FCS follows the packet */ - gsm->fcs = c; + gsm->received_fcs = c; + if (c == GSM0_SOF) { + gsm->state = GSM_SEARCH; + break; + } gsm_queue(gsm); - /* And then back for the next frame */ - gsm->state = GSM_SEARCH; + gsm->state = GSM_SSOF; + break; + case GSM_SSOF: + if (c == GSM0_SOF) { + gsm->state = GSM_SEARCH; + break; + } break; } } /** - * gsm0_receive - perform processing for non-transparency + * gsm1_receive - perform processing for non-transparency * @gsm: gsm data for this ldisc instance * @c: character * @@ -2032,9 +2068,6 @@ struct gsm_mux *gsm_alloc_mux(void) } EXPORT_SYMBOL_GPL(gsm_alloc_mux); - - - /** * gsmld_output - write to link * @gsm: our mux -- 2.20.1