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isdn/gigaset: correct CAPI connection state storage

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CAPI applications can handle several connections in parallel,
so one connection state per application isn't sufficient.
Store the connection state in the channel structure instead.

Impact: bugfix
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tilman Schmidt 2010-06-21 13:55:20 +00:00 committed by David S. Miller
parent 1ce368ff28
commit 1b4843c5e8
3 changed files with 180 additions and 53 deletions
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225
drivers/isdn/gigaset/capi.c
View File

@ -70,7 +70,7 @@
#define MAX_NUMBER_DIGITS 20
#define MAX_FMT_IE_LEN 20
/* values for gigaset_capi_appl.connected */
/* values for bcs->apconnstate */
#define APCONN_NONE 0 /* inactive/listening */
#define APCONN_SETUP 1 /* connecting */
#define APCONN_ACTIVE 2 /* B channel up */
@ -84,7 +84,6 @@ struct gigaset_capi_appl {
u16 nextMessageNumber;
u32 listenInfoMask;
u32 listenCIPmask;
int connected;
};
/* CAPI specific controller data structure */
@ -384,7 +383,7 @@ void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *dskb)
}
/* don't send further B3 messages if disconnected */
if (ap->connected < APCONN_ACTIVE) {
if (bcs->apconnstate < APCONN_ACTIVE) {
gig_dbg(DEBUG_LLDATA, "disconnected, discarding ack");
return;
}
@ -428,7 +427,7 @@ void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
}
/* don't send further B3 messages if disconnected */
if (ap->connected < APCONN_ACTIVE) {
if (bcs->apconnstate < APCONN_ACTIVE) {
gig_dbg(DEBUG_LLDATA, "disconnected, discarding data");
dev_kfree_skb_any(skb);
return;
@ -500,6 +499,7 @@ int gigaset_isdn_icall(struct at_state_t *at_state)
u32 actCIPmask;
struct sk_buff *skb;
unsigned int msgsize;
unsigned long flags;
int i;
/*
@ -624,7 +624,14 @@ int gigaset_isdn_icall(struct at_state_t *at_state)
format_ie(iif->hcmsg.CalledPartyNumber));
/* scan application list for matching listeners */
bcs->ap = NULL;
spin_lock_irqsave(&bcs->aplock, flags);
if (bcs->ap != NULL || bcs->apconnstate != APCONN_NONE) {
dev_warn(cs->dev, "%s: channel not properly cleared (%p/%d)\n",
__func__, bcs->ap, bcs->apconnstate);
bcs->ap = NULL;
bcs->apconnstate = APCONN_NONE;
}
spin_unlock_irqrestore(&bcs->aplock, flags);
actCIPmask = 1 | (1 << iif->hcmsg.CIPValue);
list_for_each_entry(ap, &iif->appls, ctrlist)
if (actCIPmask & ap->listenCIPmask) {
@ -642,10 +649,12 @@ int gigaset_isdn_icall(struct at_state_t *at_state)
dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
/* add to listeners on this B channel, update state */
spin_lock_irqsave(&bcs->aplock, flags);
ap->bcnext = bcs->ap;
bcs->ap = ap;
bcs->chstate |= CHS_NOTIFY_LL;
ap->connected = APCONN_SETUP;
bcs->apconnstate = APCONN_SETUP;
spin_unlock_irqrestore(&bcs->aplock, flags);
/* emit message */
capi_ctr_handle_message(&iif->ctr, ap->id, skb);
@ -670,7 +679,7 @@ static void send_disconnect_ind(struct bc_state *bcs,
struct gigaset_capi_ctr *iif = cs->iif;
struct sk_buff *skb;
if (ap->connected == APCONN_NONE)
if (bcs->apconnstate == APCONN_NONE)
return;
capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT, CAPI_IND,
@ -684,7 +693,6 @@ static void send_disconnect_ind(struct bc_state *bcs,
}
capi_cmsg2message(&iif->hcmsg, __skb_put(skb, CAPI_DISCONNECT_IND_LEN));
dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
ap->connected = APCONN_NONE;
capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}
@ -701,9 +709,9 @@ static void send_disconnect_b3_ind(struct bc_state *bcs,
struct sk_buff *skb;
/* nothing to do if no logical connection active */
if (ap->connected < APCONN_ACTIVE)
if (bcs->apconnstate < APCONN_ACTIVE)
return;
ap->connected = APCONN_SETUP;
bcs->apconnstate = APCONN_SETUP;
capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
ap->nextMessageNumber++,
@ -730,14 +738,25 @@ void gigaset_isdn_connD(struct bc_state *bcs)
{
struct cardstate *cs = bcs->cs;
struct gigaset_capi_ctr *iif = cs->iif;
struct gigaset_capi_appl *ap = bcs->ap;
struct gigaset_capi_appl *ap;
struct sk_buff *skb;
unsigned int msgsize;
unsigned long flags;
spin_lock_irqsave(&bcs->aplock, flags);
ap = bcs->ap;
if (!ap) {
spin_unlock_irqrestore(&bcs->aplock, flags);
dev_err(cs->dev, "%s: no application\n", __func__);
return;
}
if (bcs->apconnstate == APCONN_NONE) {
spin_unlock_irqrestore(&bcs->aplock, flags);
dev_warn(cs->dev, "%s: application %u not connected\n",
__func__, ap->id);
return;
}
spin_unlock_irqrestore(&bcs->aplock, flags);
while (ap->bcnext) {
/* this should never happen */
dev_warn(cs->dev, "%s: dropping extra application %u\n",
@ -746,11 +765,6 @@ void gigaset_isdn_connD(struct bc_state *bcs)
CapiCallGivenToOtherApplication);
ap->bcnext = ap->bcnext->bcnext;
}
if (ap->connected == APCONN_NONE) {
dev_warn(cs->dev, "%s: application %u not connected\n",
__func__, ap->id);
return;
}
/* prepare CONNECT_ACTIVE_IND message
* Note: LLC not supported by device
@ -788,17 +802,24 @@ void gigaset_isdn_connD(struct bc_state *bcs)
void gigaset_isdn_hupD(struct bc_state *bcs)
{
struct gigaset_capi_appl *ap;
unsigned long flags;
/*
* ToDo: pass on reason code reported by device
* (requires ev-layer state machine extension to collect
* ZCAU device reply)
*/
for (ap = bcs->ap; ap != NULL; ap = ap->bcnext) {
spin_lock_irqsave(&bcs->aplock, flags);
while (bcs->ap != NULL) {
ap = bcs->ap;
bcs->ap = ap->bcnext;
spin_unlock_irqrestore(&bcs->aplock, flags);
send_disconnect_b3_ind(bcs, ap);
send_disconnect_ind(bcs, ap, 0);
spin_lock_irqsave(&bcs->aplock, flags);
}
bcs->ap = NULL;
bcs->apconnstate = APCONN_NONE;
spin_unlock_irqrestore(&bcs->aplock, flags);
}
/**
@ -812,24 +833,21 @@ void gigaset_isdn_connB(struct bc_state *bcs)
{
struct cardstate *cs = bcs->cs;
struct gigaset_capi_ctr *iif = cs->iif;
struct gigaset_capi_appl *ap = bcs->ap;
struct gigaset_capi_appl *ap;
struct sk_buff *skb;
unsigned long flags;
unsigned int msgsize;
u8 command;
spin_lock_irqsave(&bcs->aplock, flags);
ap = bcs->ap;
if (!ap) {
spin_unlock_irqrestore(&bcs->aplock, flags);
dev_err(cs->dev, "%s: no application\n", __func__);
return;
}
while (ap->bcnext) {
/* this should never happen */
dev_warn(cs->dev, "%s: dropping extra application %u\n",
__func__, ap->bcnext->id);
send_disconnect_ind(bcs, ap->bcnext,
CapiCallGivenToOtherApplication);
ap->bcnext = ap->bcnext->bcnext;
}
if (!ap->connected) {
if (!bcs->apconnstate) {
spin_unlock_irqrestore(&bcs->aplock, flags);
dev_warn(cs->dev, "%s: application %u not connected\n",
__func__, ap->id);
return;
@ -841,13 +859,26 @@ void gigaset_isdn_connB(struct bc_state *bcs)
* CONNECT_B3_ACTIVE_IND in reply to CONNECT_B3_RESP
* Parameters in both cases always: NCCI = 1, NCPI empty
*/
if (ap->connected >= APCONN_ACTIVE) {
if (bcs->apconnstate >= APCONN_ACTIVE) {
command = CAPI_CONNECT_B3_ACTIVE;
msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
} else {
command = CAPI_CONNECT_B3;
msgsize = CAPI_CONNECT_B3_IND_BASELEN;
}
bcs->apconnstate = APCONN_ACTIVE;
spin_unlock_irqrestore(&bcs->aplock, flags);
while (ap->bcnext) {
/* this should never happen */
dev_warn(cs->dev, "%s: dropping extra application %u\n",
__func__, ap->bcnext->id);
send_disconnect_ind(bcs, ap->bcnext,
CapiCallGivenToOtherApplication);
ap->bcnext = ap->bcnext->bcnext;
}
capi_cmsg_header(&iif->hcmsg, ap->id, command, CAPI_IND,
ap->nextMessageNumber++,
iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
@ -858,7 +889,6 @@ void gigaset_isdn_connB(struct bc_state *bcs)
}
capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
ap->connected = APCONN_ACTIVE;
capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}
@ -964,6 +994,61 @@ static void gigaset_register_appl(struct capi_ctr *ctr, u16 appl,
ap->rp = *rp;
list_add(&ap->ctrlist, &iif->appls);
dev_info(cs->dev, "application %u registered\n", ap->id);
}
/*
* remove CAPI application from channel
* helper function to keep indentation levels down and stay in 80 columns
*/
static inline void remove_appl_from_channel(struct bc_state *bcs,
struct gigaset_capi_appl *ap)
{
struct cardstate *cs = bcs->cs;
struct gigaset_capi_appl *bcap;
unsigned long flags;
int prevconnstate;
spin_lock_irqsave(&bcs->aplock, flags);
bcap = bcs->ap;
if (bcap == NULL) {
spin_unlock_irqrestore(&bcs->aplock, flags);
return;
}
/* check first application on channel */
if (bcap == ap) {
bcs->ap = ap->bcnext;
if (bcs->ap != NULL) {
spin_unlock_irqrestore(&bcs->aplock, flags);
return;
}
/* none left, clear channel state */
prevconnstate = bcs->apconnstate;
bcs->apconnstate = APCONN_NONE;
spin_unlock_irqrestore(&bcs->aplock, flags);
if (prevconnstate == APCONN_ACTIVE) {
dev_notice(cs->dev, "%s: hanging up channel %u\n",
__func__, bcs->channel);
gigaset_add_event(cs, &bcs->at_state,
EV_HUP, NULL, 0, NULL);
gigaset_schedule_event(cs);
}
return;
}
/* check remaining list */
do {
if (bcap->bcnext == ap) {
bcap->bcnext = bcap->bcnext->bcnext;
return;
}
bcap = bcap->bcnext;
} while (bcap != NULL);
spin_unlock_irqrestore(&bcs->aplock, flags);
}
/*
@ -975,19 +1060,19 @@ static void gigaset_release_appl(struct capi_ctr *ctr, u16 appl)
= container_of(ctr, struct gigaset_capi_ctr, ctr);
struct cardstate *cs = iif->ctr.driverdata;
struct gigaset_capi_appl *ap, *tmp;
unsigned ch;
list_for_each_entry_safe(ap, tmp, &iif->appls, ctrlist)
if (ap->id == appl) {
if (ap->connected != APCONN_NONE) {
dev_err(cs->dev,
"%s: application %u still connected\n",
__func__, ap->id);
/* ToDo: clear active connection */
}
/* remove from any channels */
for (ch = 0; ch < cs->channels; ch++)
remove_appl_from_channel(&cs->bcs[ch], ap);
/* remove from registration list */
list_del(&ap->ctrlist);
kfree(ap);
dev_info(cs->dev, "application %u released\n", appl);
}
}
/*
@ -1166,6 +1251,7 @@ static void do_connect_req(struct gigaset_capi_ctr *iif,
char **commands;
char *s;
u8 *pp;
unsigned long flags;
int i, l, lbc, lhlc;
u16 info;
@ -1181,8 +1267,15 @@ static void do_connect_req(struct gigaset_capi_ctr *iif,
send_conf(iif, ap, skb, CapiNoPlciAvailable);
return;
}
spin_lock_irqsave(&bcs->aplock, flags);
if (bcs->ap != NULL || bcs->apconnstate != APCONN_NONE)
dev_warn(cs->dev, "%s: channel not properly cleared (%p/%d)\n",
__func__, bcs->ap, bcs->apconnstate);
ap->bcnext = NULL;
bcs->ap = ap;
bcs->apconnstate = APCONN_SETUP;
spin_unlock_irqrestore(&bcs->aplock, flags);
bcs->rx_bufsize = ap->rp.datablklen;
dev_kfree_skb(bcs->rx_skb);
gigaset_new_rx_skb(bcs);
@ -1419,7 +1512,6 @@ static void do_connect_req(struct gigaset_capi_ctr *iif,
goto error;
}
gigaset_schedule_event(cs);
ap->connected = APCONN_SETUP;
send_conf(iif, ap, skb, CapiSuccess);
return;
@ -1447,6 +1539,7 @@ static void do_connect_resp(struct gigaset_capi_ctr *iif,
_cmsg *cmsg = &iif->acmsg;
struct bc_state *bcs;
struct gigaset_capi_appl *oap;
unsigned long flags;
int channel;
/* decode message */
@ -1466,12 +1559,21 @@ static void do_connect_resp(struct gigaset_capi_ctr *iif,
switch (cmsg->Reject) {
case 0: /* Accept */
/* drop all competing applications, keep only this one */
for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
if (oap != ap)
spin_lock_irqsave(&bcs->aplock, flags);
while (bcs->ap != NULL) {
oap = bcs->ap;
bcs->ap = oap->bcnext;
if (oap != ap) {
spin_unlock_irqrestore(&bcs->aplock, flags);
send_disconnect_ind(bcs, oap,
CapiCallGivenToOtherApplication);
spin_lock_irqsave(&bcs->aplock, flags);
}
}
ap->bcnext = NULL;
bcs->ap = ap;
spin_unlock_irqrestore(&bcs->aplock, flags);
bcs->rx_bufsize = ap->rp.datablklen;
dev_kfree_skb(bcs->rx_skb);
gigaset_new_rx_skb(bcs);
@ -1542,31 +1644,45 @@ static void do_connect_resp(struct gigaset_capi_ctr *iif,
send_disconnect_ind(bcs, ap, 0);
/* remove it from the list of listening apps */
spin_lock_irqsave(&bcs->aplock, flags);
if (bcs->ap == ap) {
bcs->ap = ap->bcnext;
if (bcs->ap == NULL)
if (bcs->ap == NULL) {
/* last one: stop ev-layer hupD notifications */
bcs->apconnstate = APCONN_NONE;
bcs->chstate &= ~CHS_NOTIFY_LL;
}
spin_unlock_irqrestore(&bcs->aplock, flags);
return;
}
for (oap = bcs->ap; oap != NULL; oap = oap->bcnext) {
if (oap->bcnext == ap) {
oap->bcnext = oap->bcnext->bcnext;
spin_unlock_irqrestore(&bcs->aplock, flags);
return;
}
}
spin_unlock_irqrestore(&bcs->aplock, flags);
dev_err(cs->dev, "%s: application %u not found\n",
__func__, ap->id);
return;
default: /* Reject */
/* drop all competing applications, keep only this one */
for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
if (oap != ap)
spin_lock_irqsave(&bcs->aplock, flags);
while (bcs->ap != NULL) {
oap = bcs->ap;
bcs->ap = oap->bcnext;
if (oap != ap) {
spin_unlock_irqrestore(&bcs->aplock, flags);
send_disconnect_ind(bcs, oap,
CapiCallGivenToOtherApplication);
spin_lock_irqsave(&bcs->aplock, flags);
}
}
ap->bcnext = NULL;
bcs->ap = ap;
spin_unlock_irqrestore(&bcs->aplock, flags);
/* reject call - will trigger DISCONNECT_IND for this app */
dev_info(cs->dev, "%s: Reject=%x\n",
@ -1589,6 +1705,7 @@ static void do_connect_b3_req(struct gigaset_capi_ctr *iif,
{
struct cardstate *cs = iif->ctr.driverdata;
_cmsg *cmsg = &iif->acmsg;
struct bc_state *bcs;
int channel;
/* decode message */
@ -1603,9 +1720,10 @@ static void do_connect_b3_req(struct gigaset_capi_ctr *iif,
send_conf(iif, ap, skb, CapiIllContrPlciNcci);
return;
}
bcs = &cs->bcs[channel-1];
/* mark logical connection active */
ap->connected = APCONN_ACTIVE;
bcs->apconnstate = APCONN_ACTIVE;
/* build NCCI: always 1 (one B3 connection only) */
cmsg->adr.adrNCCI |= 1 << 16;
@ -1651,7 +1769,7 @@ static void do_connect_b3_resp(struct gigaset_capi_ctr *iif,
if (cmsg->Reject) {
/* Reject: clear B3 connect received flag */
ap->connected = APCONN_SETUP;
bcs->apconnstate = APCONN_SETUP;
/* trigger hangup, causing eventual DISCONNECT_IND */
if (!gigaset_add_event(cs, &bcs->at_state,
@ -1723,11 +1841,11 @@ static void do_disconnect_req(struct gigaset_capi_ctr *iif,
}
/* skip if DISCONNECT_IND already sent */
if (!ap->connected)
if (!bcs->apconnstate)
return;
/* check for active logical connection */
if (ap->connected >= APCONN_ACTIVE) {
if (bcs->apconnstate >= APCONN_ACTIVE) {
/*
* emit DISCONNECT_B3_IND with cause 0x3301
* use separate cmsg structure, as the content of iif->acmsg
@ -1776,6 +1894,7 @@ static void do_disconnect_b3_req(struct gigaset_capi_ctr *iif,
{
struct cardstate *cs = iif->ctr.driverdata;
_cmsg *cmsg = &iif->acmsg;
struct bc_state *bcs;
int channel;
/* decode message */
@ -1791,17 +1910,17 @@ static void do_disconnect_b3_req(struct gigaset_capi_ctr *iif,
send_conf(iif, ap, skb, CapiIllContrPlciNcci);
return;
}
bcs = &cs->bcs[channel-1];
/* reject if logical connection not active */
if (ap->connected < APCONN_ACTIVE) {
if (bcs->apconnstate < APCONN_ACTIVE) {
send_conf(iif, ap, skb,
CapiMessageNotSupportedInCurrentState);
return;
}
/* trigger hangup, causing eventual DISCONNECT_B3_IND */
if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
EV_HUP, NULL, 0, NULL)) {
if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
return;
}
@ -1822,6 +1941,7 @@ static void do_data_b3_req(struct gigaset_capi_ctr *iif,
struct sk_buff *skb)
{
struct cardstate *cs = iif->ctr.driverdata;
struct bc_state *bcs;
int channel = CAPIMSG_PLCI_PART(skb->data);
u16 ncci = CAPIMSG_NCCI_PART(skb->data);
u16 msglen = CAPIMSG_LEN(skb->data);
@ -1844,6 +1964,7 @@ static void do_data_b3_req(struct gigaset_capi_ctr *iif,
send_conf(iif, ap, skb, CapiIllContrPlciNcci);
return;
}
bcs = &cs->bcs[channel-1];
if (msglen != CAPI_DATA_B3_REQ_LEN && msglen != CAPI_DATA_B3_REQ_LEN64)
dev_notice(cs->dev, "%s: unexpected length %d\n",
"DATA_B3_REQ", msglen);
@ -1863,7 +1984,7 @@ static void do_data_b3_req(struct gigaset_capi_ctr *iif,
}
/* reject if logical connection not active */
if (ap->connected < APCONN_ACTIVE) {
if (bcs->apconnstate < APCONN_ACTIVE) {
send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
return;
}
@ -1874,7 +1995,7 @@ static void do_data_b3_req(struct gigaset_capi_ctr *iif,
skb_pull(skb, msglen);
/* pass to device-specific module */
if (cs->ops->send_skb(&cs->bcs[channel-1], skb) < 0) {
if (cs->ops->send_skb(bcs, skb) < 0) {
send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
return;
}

4
drivers/isdn/gigaset/common.c
View File

@ -649,6 +649,10 @@ static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
for (i = 0; i < AT_NUM; ++i)
bcs->commands[i] = NULL;
spin_lock_init(&bcs->aplock);
bcs->ap = NULL;
bcs->apconnstate = 0;
gig_dbg(DEBUG_INIT, " setting up bcs[%d]->hw", channel);
if (cs->ops->initbcshw(bcs))
return bcs;

4
drivers/isdn/gigaset/gigaset.h
View File

@ -403,7 +403,9 @@ struct bc_state {
struct bas_bc_state *bas; /* usb hardware driver (base) */
} hw;
void *ap; /* LL application structure */
void *ap; /* associated LL application */
int apconnstate; /* LL application connection state */
spinlock_t aplock;
};
struct cardstate {