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authorTilman Schmidt <tilman@imap.cc>2009-10-06 12:18:10 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-06 22:20:53 -0700
commite48470217d1822e3566b657002c6f79bd7a77345 (patch)
tree200e267a4149e63806afda52809590a7bacf34b7 /drivers/isdn
parent812d73473af23dd738afa83ab77cd6c733b3721f (diff)
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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>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/capi/capidrv.c25
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/isdn/capi/capidrv.c b/drivers/isdn/capi/capidrv.c
index 6501202..4921eae 100644
--- a/drivers/isdn/capi/capidrv.c
+++ b/drivers/isdn/capi/capidrv.c
@@ -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)