From 10c6c383e43565c9c6ec07ff8eb2825f8091bdf0 Mon Sep 17 00:00:00 2001 From: "samix.lebsir" Date: Mon, 13 Aug 2012 13:44:22 +0100 Subject: [PATCH] char: n_gsm: remove message filtering for contipated DLCI The design of uplink flow control in the mux driver is that for constipated channels data will backup into the per-channel fifos, and any messages that make it to the outbound message queue will still go out. Code was added to also stop messages that were in the outbound queue but this requires filtering through all the messages on the queue for stopped dlcis and changes some of the mux logic unneccessarily. The message fiiltering was removed to be in line w/ the original design as the message filtering does not provide any solution. Extra debug messages used during investigation were also removed. Signed-off-by: samix.lebsir Signed-off-by: Alan Cox Cc: Dressage Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_gsm.c | 25 +------------------------ 1 file changed, 1 insertion(+), 24 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index db15b562a29e..5f68f2a70c5c 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -691,10 +691,6 @@ static void gsm_data_kick(struct gsm_mux *gsm) msg = msg->next; continue; } - if (gsm->dlci[msg->addr]->constipated) { - msg = msg->next; - continue; - } if (gsm->encoding != 0) { gsm->txframe[0] = GSM1_SOF; len = gsm_stuff_frame(msg->data, @@ -748,8 +744,6 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg) u8 *dp = msg->data; u8 *fcs = dp + msg->len; - WARN_ONCE(dlci->constipated, "%s: queueing from a constipated DLCI", - __func__); /* Fill in the header */ if (gsm->encoding == 0) { if (msg->len < 128) @@ -956,9 +950,6 @@ static void gsm_dlci_data_sweep(struct gsm_mux *gsm) break; dlci = gsm->dlci[i]; if (dlci == NULL || dlci->constipated) { - if (dlci && (debug & 0x20)) - pr_info("%s: DLCI %d is constipated", - __func__, i); i++; continue; } @@ -988,12 +979,8 @@ static void gsm_dlci_data_kick(struct gsm_dlci *dlci) unsigned long flags; int sweep; - if (dlci->constipated) { - if (debug & 0x20) - pr_info("%s: DLCI %d is constipated", - __func__, dlci->addr); + if (dlci->constipated) return; - } spin_lock_irqsave(&dlci->gsm->tx_lock, flags); /* If we have nothing running then we need to fire up */ @@ -1069,15 +1056,9 @@ static void gsm_process_modem(struct tty_struct *tty, struct gsm_dlci *dlci, /* Flow control/ready to communicate */ fc = (modem & MDM_FC) || !(modem & MDM_RTR); if (fc && !dlci->constipated) { - if (debug & 0x20) - pr_info("%s: DLCI %d START constipated (tx_bytes=%d)", - __func__, dlci->addr, dlci->gsm->tx_bytes); /* Need to throttle our output on this device */ dlci->constipated = 1; } else if (!fc && dlci->constipated) { - if (debug & 0x20) - pr_info("%s: DLCI %d END constipated (tx_bytes=%d)", - __func__, dlci->addr, dlci->gsm->tx_bytes); dlci->constipated = 0; gsm_dlci_data_kick(dlci); } @@ -1241,8 +1222,6 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command, break; case CMD_FCON: /* Modem can accept data again */ - if (debug & 0x20) - pr_info("%s: GSM END constipation", __func__); gsm->constipated = 0; gsm_control_reply(gsm, CMD_FCON, NULL, 0); /* Kick the link in case it is idling */ @@ -1250,8 +1229,6 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command, break; case CMD_FCOFF: /* Modem wants us to STFU */ - if (debug & 0x20) - pr_info("%s: GSM START constipation", __func__); gsm->constipated = 1; gsm_control_reply(gsm, CMD_FCOFF, NULL, 0); break;