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tty: n_gsm: Save dlci address open status when config requester

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When n_gsm config "initiator=0",as requester ,receive SABM frame,n_gsm
register gsmtty dev,and save dlci open address status,if receive DLC0
DISC or CLD frame,it can unregister the gsmtty dev by saving dlci address.

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
Link: https://lore.kernel.org/r/1629461872-26965-8-git-send-email-zhenguo6858@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhenguo Zhao 2021-08-20 20:17:52 +08:00 committed by Greg Kroah-Hartman
parent 5b87686e32
commit 0b91b53323
1 changed files with 53 additions and 4 deletions
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57
drivers/tty/n_gsm.c
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@ -271,6 +271,10 @@ static DEFINE_SPINLOCK(gsm_mux_lock);
static struct tty_driver *gsm_tty_driver;
/* Save dlci open address */
static int addr_open[256] = { 0 };
/* Save dlci open count */
static int addr_cnt;
/*
* This section of the driver logic implements the GSM encodings
* both the basic and the 'advanced'. Reliable transport is not
@ -1181,6 +1185,7 @@ static void gsm_control_rls(struct gsm_mux *gsm, const u8 *data, int clen)
}
static void gsm_dlci_begin_close(struct gsm_dlci *dlci);
static void gsm_dlci_close(struct gsm_dlci *dlci);
/**
* gsm_control_message - DLCI 0 control processing
@ -1199,15 +1204,28 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command,
{
u8 buf[1];
unsigned long flags;
struct gsm_dlci *dlci;
int i;
int address;
switch (command) {
case CMD_CLD: {
struct gsm_dlci *dlci = gsm->dlci[0];
if (addr_cnt > 0) {
for (i = 0; i < addr_cnt; i++) {
address = addr_open[i];
dlci = gsm->dlci[address];
gsm_dlci_close(dlci);
addr_open[i] = 0;
}
}
/* Modem wishes to close down */
dlci = gsm->dlci[0];
if (dlci) {
dlci->dead = true;
gsm->dead = true;
gsm_dlci_begin_close(dlci);
gsm_dlci_close(dlci);
addr_cnt = 0;
gsm_response(gsm, 0, UA|PF);
}
}
break;
@ -1756,6 +1774,7 @@ static void gsm_queue(struct gsm_mux *gsm)
struct gsm_dlci *dlci;
u8 cr;
int address;
int i, j, k, address_tmp;
/* We have to sneak a look at the packet body to do the FCS.
A somewhat layering violation in the spec */
@ -1798,6 +1817,11 @@ static void gsm_queue(struct gsm_mux *gsm)
else {
gsm_response(gsm, address, UA|PF);
gsm_dlci_open(dlci);
/* Save dlci open address */
if (address) {
addr_open[addr_cnt] = address;
addr_cnt++;
}
}
break;
case DISC|PF:
@ -1808,8 +1832,33 @@ static void gsm_queue(struct gsm_mux *gsm)
return;
}
/* Real close complete */
gsm_response(gsm, address, UA|PF);
gsm_dlci_close(dlci);
if (!address) {
if (addr_cnt > 0) {
for (i = 0; i < addr_cnt; i++) {
address = addr_open[i];
dlci = gsm->dlci[address];
gsm_dlci_close(dlci);
addr_open[i] = 0;
}
}
dlci = gsm->dlci[0];
gsm_dlci_close(dlci);
addr_cnt = 0;
gsm_response(gsm, 0, UA|PF);
} else {
gsm_response(gsm, address, UA|PF);
gsm_dlci_close(dlci);
/* clear dlci address */
for (j = 0; j < addr_cnt; j++) {
address_tmp = addr_open[j];
if (address_tmp == address) {
for (k = j; k < addr_cnt; k++)
addr_open[k] = addr_open[k+1];
addr_cnt--;
break;
}
}
}
break;
case UA:
case UA|PF: