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isdn: avoid races in capidrv 

In several places, capidrv sends a CAPI message to the ISDN
device and then updates its internal state accordingly.
If the response message from the device arrives before the
state is updated, it may be rejected or processed incorrectly.
Avoid these races by updating the state before emitting the
message.

Impact: bugfix
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Acked-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tilman Schmidt 2009-10-06 12:18:10 +00:00 коммит произвёл David S. Miller
Родитель 812d73473a
Коммит e48470217d
1 изменённых файлов: 13 добавлений и 12 удалений
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25
drivers/isdn/capi/capidrv.c
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@ -671,8 +671,8 @@ static void n0(capidrv_contr * card, capidrv_ncci * ncci)
NULL, /* Useruserdata */ /* $$$$ */
NULL /* Facilitydataarray */
);
send_message(card, &cmsg);
plci_change_state(card, ncci->plcip, EV_PLCI_DISCONNECT_REQ);
send_message(card, &cmsg);
cmd.command = ISDN_STAT_BHUP;
cmd.driver = card->myid;
@ -924,8 +924,8 @@ static void handle_incoming_call(capidrv_contr * card, _cmsg * cmsg)
*/
capi_cmsg_answer(cmsg);
cmsg->Reject = 1; /* ignore */
send_message(card, cmsg);
plci_change_state(card, plcip, EV_PLCI_CONNECT_REJECT);
send_message(card, cmsg);
printk(KERN_INFO "capidrv-%d: incoming call %s,%d,%d,%s ignored\n",
card->contrnr,
cmd.parm.setup.phone,
@ -974,8 +974,8 @@ static void handle_incoming_call(capidrv_contr * card, _cmsg * cmsg)
case 2: /* Call will be rejected. */
capi_cmsg_answer(cmsg);
cmsg->Reject = 2; /* reject call, normal call clearing */
send_message(card, cmsg);
plci_change_state(card, plcip, EV_PLCI_CONNECT_REJECT);
send_message(card, cmsg);
break;
default:
@ -983,8 +983,8 @@ static void handle_incoming_call(capidrv_contr * card, _cmsg * cmsg)
capi_cmsg_answer(cmsg);
cmsg->Reject = 8; /* reject call,
destination out of order */
send_message(card, cmsg);
plci_change_state(card, plcip, EV_PLCI_CONNECT_REJECT);
send_message(card, cmsg);
break;
}
return;
@ -1020,8 +1020,8 @@ static void handle_plci(_cmsg * cmsg)
card->bchans[plcip->chan].disconnecting = 1;
plci_change_state(card, plcip, EV_PLCI_DISCONNECT_IND);
capi_cmsg_answer(cmsg);
send_message(card, cmsg);
plci_change_state(card, plcip, EV_PLCI_DISCONNECT_RESP);
send_message(card, cmsg);
break;
case CAPI_DISCONNECT_CONF: /* plci */
@ -1078,8 +1078,8 @@ static void handle_plci(_cmsg * cmsg)
if (card->bchans[plcip->chan].incoming) {
capi_cmsg_answer(cmsg);
send_message(card, cmsg);
plci_change_state(card, plcip, EV_PLCI_CONNECT_ACTIVE_IND);
send_message(card, cmsg);
} else {
capidrv_ncci *nccip;
capi_cmsg_answer(cmsg);
@ -1098,13 +1098,14 @@ static void handle_plci(_cmsg * cmsg)
NULL /* NCPI */
);
nccip->msgid = cmsg->Messagenumber;
plci_change_state(card, plcip,
EV_PLCI_CONNECT_ACTIVE_IND);
ncci_change_state(card, nccip, EV_NCCI_CONNECT_B3_REQ);
send_message(card, cmsg);
cmd.command = ISDN_STAT_DCONN;
cmd.driver = card->myid;
cmd.arg = plcip->chan;
card->interface.statcallb(&cmd);
plci_change_state(card, plcip, EV_PLCI_CONNECT_ACTIVE_IND);
ncci_change_state(card, nccip, EV_NCCI_CONNECT_B3_REQ);
}
break;
@ -1193,8 +1194,8 @@ static void handle_ncci(_cmsg * cmsg)
goto notfound;
capi_cmsg_answer(cmsg);
send_message(card, cmsg);
ncci_change_state(card, nccip, EV_NCCI_CONNECT_B3_ACTIVE_IND);
send_message(card, cmsg);
cmd.command = ISDN_STAT_BCONN;
cmd.driver = card->myid;
@ -1222,8 +1223,8 @@ static void handle_ncci(_cmsg * cmsg)
0, /* Reject */
NULL /* NCPI */
);
send_message(card, cmsg);
ncci_change_state(card, nccip, EV_NCCI_CONNECT_B3_RESP);
send_message(card, cmsg);
break;
}
printk(KERN_ERR "capidrv-%d: no mem for ncci, sorry\n", card->contrnr);
@ -1299,8 +1300,8 @@ static void handle_ncci(_cmsg * cmsg)
card->bchans[nccip->chan].disconnecting = 1;
ncci_change_state(card, nccip, EV_NCCI_DISCONNECT_B3_IND);
capi_cmsg_answer(cmsg);
send_message(card, cmsg);
ncci_change_state(card, nccip, EV_NCCI_DISCONNECT_B3_RESP);
send_message(card, cmsg);
break;
case CAPI_DISCONNECT_B3_CONF: /* ncci */
@ -2014,8 +2015,8 @@ static void send_listen(capidrv_contr *card)
card->cipmask,
card->cipmask2,
NULL, NULL);
send_message(card, &cmdcmsg);
listen_change_state(card, EV_LISTEN_REQ);
send_message(card, &cmdcmsg);
}
static void listentimerfunc(unsigned long x)