From 71e0779153968c79038a8ed53610d69624115fca Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 31 May 2017 08:19:05 +0200 Subject: [PATCH] tty: n_gsm: do not send/receive in ldisc close path gsm_cleanup_mux() is called in the line discipline close path which is called at tty_release() time. At this stage the tty is no longer operational enough to send any frames. Sending close frames is therefore not possible and waiting for their answers always times out. This patch removes sending close messages and waiting for their answers from the tty_release path. This patch makes explicit what previously implicitly had been the case already: We are not able to tell the modem that we are about to close the multiplexer on our side. This means the modem will stay in multiplexer mode and re-establishing the multiplexer later fails. The only way for userspace to work around this is to manually send a close frame in N_TTY mode after closing the mux. Signed-off-by: Sascha Hauer Signed-off-by: Greg Kroah-Hartman --- Documentation/serial/n_gsm.txt | 7 +++++ drivers/tty/n_gsm.c | 54 ++++++++++++++++++++++------------ 2 files changed, 42 insertions(+), 19 deletions(-) diff --git a/Documentation/serial/n_gsm.txt b/Documentation/serial/n_gsm.txt index a5d91126a8f7..875361bb7cb4 100644 --- a/Documentation/serial/n_gsm.txt +++ b/Documentation/serial/n_gsm.txt @@ -77,6 +77,13 @@ for example, it's possible : 6- first close all virtual ports before closing the physical port. +Note that after closing the physical port the modem is still in multiplexing +mode. This may prevent a successful re-opening of the port later. To avoid +this situation either reset the modem if your hardware allows that or send +a disconnect command frame manually before initializing the multiplexing mode +for the second time. The byte sequence for the disconnect command frame is: +0xf9, 0x03, 0xef, 0x03, 0xc3, 0x16, 0xf9. + Additional Documentation ------------------------ More practical details on the protocol and how it's supported by industrial diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 2667a205a5ab..363a8ca824ad 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2015,6 +2015,33 @@ static void gsm_error(struct gsm_mux *gsm, gsm->io_error++; } +static int gsm_disconnect(struct gsm_mux *gsm) +{ + struct gsm_dlci *dlci = gsm->dlci[0]; + struct gsm_control *gc; + + if (!dlci) + return 0; + + /* In theory disconnecting DLCI 0 is sufficient but for some + modems this is apparently not the case. */ + gc = gsm_control_send(gsm, CMD_CLD, NULL, 0); + if (gc) + gsm_control_wait(gsm, gc); + + del_timer_sync(&gsm->t2_timer); + /* Now we are sure T2 has stopped */ + + gsm_dlci_begin_close(dlci); + wait_event_interruptible(gsm->event, + dlci->state == DLCI_CLOSED); + + if (signal_pending(current)) + return -EINTR; + + return 0; +} + /** * gsm_cleanup_mux - generic GSM protocol cleanup * @gsm: our mux @@ -2029,7 +2056,6 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm) int i; struct gsm_dlci *dlci = gsm->dlci[0]; struct gsm_msg *txq, *ntxq; - struct gsm_control *gc; gsm->dead = 1; @@ -2045,21 +2071,11 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm) if (i == MAX_MUX) return; - /* In theory disconnecting DLCI 0 is sufficient but for some - modems this is apparently not the case. */ - if (dlci) { - gc = gsm_control_send(gsm, CMD_CLD, NULL, 0); - if (gc) - gsm_control_wait(gsm, gc); - } del_timer_sync(&gsm->t2_timer); /* Now we are sure T2 has stopped */ - if (dlci) { + if (dlci) dlci->dead = 1; - gsm_dlci_begin_close(dlci); - wait_event_interruptible(gsm->event, - dlci->state == DLCI_CLOSED); - } + /* Free up any link layer users */ mutex_lock(&gsm->mutex); for (i = 0; i < NUM_DLCI; i++) @@ -2519,12 +2535,12 @@ static int gsmld_config(struct tty_struct *tty, struct gsm_mux *gsm, */ if (need_close || need_restart) { - gsm_dlci_begin_close(gsm->dlci[0]); - /* This will timeout if the link is down due to N2 expiring */ - wait_event_interruptible(gsm->event, - gsm->dlci[0]->state == DLCI_CLOSED); - if (signal_pending(current)) - return -EINTR; + int ret; + + ret = gsm_disconnect(gsm); + + if (ret) + return ret; } if (need_restart) gsm_cleanup_mux(gsm);