Merged revisions 221769 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r221769 | rmudgett | 2009-10-01 18:18:28 -0500 (Thu, 01 Oct 2009) | 26 lines Occasionally losing use of B channels in chan_misdn. I have not been able to reproduce the problem of losing channels. However, I have seen in the code a reentrancy problem that might give these symptoms. The reentrancy patch does several things: 1) Guards B channel and B channel structure allocation. 2) Makes the B channel structure find routines more precise in locating records. 3) Never leave a B channel allocated if we received cause 44. The last item may cause temporary outgoing call problems, but they should clear when the line becomes idle. (closes issue #15490) Reported by: slutec18 Patches: issue15490_channel_alloc_reentrancy.patch uploaded by rmudgett (license 664) Tested by: rmudgett, slutec18 (closes issue #15458) Reported by: FabienToune Patches: issue15458_channel_alloc_reentrancy.patch uploaded by rmudgett (license 664) Tested by: FabienToune, rmudgett, slutec18 ........ git-svn-id: http://svn.digium.com/svn/asterisk/trunk@221844 f38db490-d61c-443f-a65b-d21fe96a405b
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@ -528,6 +528,7 @@ static int find_free_chan_in_stack(struct misdn_stack *stack, struct misdn_bchan
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#if defined(AST_MISDN_ENHANCEMENTS)
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if (bc->is_register_pool) {
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pthread_mutex_lock(&stack->st_lock);
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for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->channels); ++i) {
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if (!stack->channels[i]) {
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chan = i + 1;
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@ -547,6 +548,7 @@ static int find_free_chan_in_stack(struct misdn_stack *stack, struct misdn_bchan
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--channel;
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pthread_mutex_lock(&stack->st_lock);
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bnums = stack->pri ? stack->b_num : stack->b_num - 1;
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if (dec) {
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for (i = bnums; i >= 0; --i) {
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@ -572,6 +574,7 @@ static int find_free_chan_in_stack(struct misdn_stack *stack, struct misdn_bchan
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}
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if (!chan) {
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pthread_mutex_unlock(&stack->st_lock);
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cb_log(1, stack->port, " !! NO FREE CHAN IN STACK\n");
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dump_chan_list(stack);
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bc->out_cause = AST_CAUSE_NORMAL_CIRCUIT_CONGESTION;
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@ -579,10 +582,12 @@ static int find_free_chan_in_stack(struct misdn_stack *stack, struct misdn_bchan
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}
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if (set_chan_in_stack(stack, chan) < 0) {
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pthread_mutex_unlock(&stack->st_lock);
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cb_log(0, stack->port, "Channel Already in use:%d\n", chan);
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bc->out_cause = AST_CAUSE_REQUESTED_CHAN_UNAVAIL;
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return -1;
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}
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pthread_mutex_unlock(&stack->st_lock);
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bc->channel = chan;
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return 0;
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@ -865,15 +870,15 @@ static void clear_l3(struct misdn_stack *stack)
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if (global_state == MISDN_INITIALIZED) {
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for (i = 0; i <= stack->b_num; ++i) {
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cb_event(EVENT_CLEANUP, &stack->bc[i], NULL);
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empty_chan_in_stack(stack, i + 1);
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empty_bc(&stack->bc[i]);
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clean_up_bc(&stack->bc[i]);
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empty_chan_in_stack(stack, i + 1);
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stack->bc[i].in_use = 0;
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}
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#if defined(AST_MISDN_ENHANCEMENTS)
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for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
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empty_chan_in_stack(stack, i + 1);
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empty_bc(&stack->bc[i]);
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empty_chan_in_stack(stack, i + 1);
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stack->bc[i].in_use = 0;
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}
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#endif /* defined(AST_MISDN_ENHANCEMENTS) */
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@ -1328,6 +1333,8 @@ static struct misdn_stack *stack_init(int midev, int port, int ptp)
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msg_queue_init(&stack->downqueue);
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msg_queue_init(&stack->upqueue);
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pthread_mutex_init(&stack->st_lock, NULL);
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/* query port's requirements */
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ret = mISDN_get_stack_info(midev, port, buff, sizeof(buff));
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if (ret < 0) {
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@ -1496,6 +1503,8 @@ static void stack_destroy(struct misdn_stack *stack)
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if (stack->upper_id)
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mISDN_write_frame(stack->midev, buf, stack->upper_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);
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pthread_mutex_destroy(&stack->st_lock);
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}
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@ -1547,14 +1556,14 @@ static struct misdn_bchannel *find_bc_by_masked_l3id(struct misdn_stack *stack,
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int i;
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for (i = 0; i <= stack->b_num; ++i) {
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if ((stack->bc[i].l3_id & mask) == (l3id & mask)) {
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if (stack->bc[i].in_use && (stack->bc[i].l3_id & mask) == (l3id & mask)) {
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return &stack->bc[i];
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}
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}
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#if defined(AST_MISDN_ENHANCEMENTS)
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/* Search the B channel records for a REGISTER signaling link. */
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for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
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if ((stack->bc[i].l3_id & mask) == (l3id & mask)) {
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if (stack->bc[i].in_use && (stack->bc[i].l3_id & mask) == (l3id & mask)) {
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return &stack->bc[i];
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}
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}
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@ -1568,14 +1577,14 @@ struct misdn_bchannel *find_bc_by_l3id(struct misdn_stack *stack, unsigned long
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int i;
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for (i = 0; i <= stack->b_num; ++i) {
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if (stack->bc[i].l3_id == l3id) {
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if (stack->bc[i].in_use && stack->bc[i].l3_id == l3id) {
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return &stack->bc[i];
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}
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}
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#if defined(AST_MISDN_ENHANCEMENTS)
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/* Search the B channel records for a REGISTER signaling link. */
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for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
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if (stack->bc[i].l3_id == l3id) {
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if (stack->bc[i].in_use && stack->bc[i].l3_id == l3id) {
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return &stack->bc[i];
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}
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}
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@ -1588,11 +1597,11 @@ static struct misdn_bchannel *find_bc_by_addr(unsigned long addr)
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struct misdn_stack *stack;
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int i;
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for (stack=glob_mgr->stack_list;
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stack;
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stack=stack->next) {
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for (i=0; i<=stack->b_num; i++) {
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if ( (stack->bc[i].addr&STACK_ID_MASK)==(addr&STACK_ID_MASK) || stack->bc[i].layer_id== addr ) {
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for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
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for (i = 0; i <= stack->b_num; i++) {
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if (stack->bc[i].in_use
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&& ((stack->bc[i].addr & STACK_ID_MASK) == (addr & STACK_ID_MASK)
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|| stack->bc[i].layer_id == addr)) {
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return &stack->bc[i];
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}
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}
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@ -1606,11 +1615,9 @@ static struct misdn_bchannel *find_bc_by_confid(unsigned long confid)
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struct misdn_stack *stack;
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int i;
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for (stack=glob_mgr->stack_list;
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stack;
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stack=stack->next) {
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for (i=0; i<=stack->b_num; i++) {
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if ( stack->bc[i].conf_id==confid ) {
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for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
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for (i = 0; i <= stack->b_num; i++) {
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if (stack->bc[i].in_use && stack->bc[i].conf_id == confid) {
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return &stack->bc[i];
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}
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}
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@ -1624,10 +1631,12 @@ static struct misdn_bchannel *find_bc_by_channel(int port, int channel)
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struct misdn_stack *stack = find_stack_by_port(port);
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int i;
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if (!stack) return NULL;
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if (!stack) {
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return NULL;
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}
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for (i=0; i<=stack->b_num; i++) {
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if ( stack->bc[i].channel== channel ) {
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for (i = 0; i <= stack->b_num; i++) {
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if (stack->bc[i].in_use && stack->bc[i].channel == channel) {
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return &stack->bc[i];
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}
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}
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@ -1814,6 +1823,7 @@ static int handle_cr ( struct misdn_stack *stack, iframe_t *frm)
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/* Empties bc if it's reserved (no SETUP out yet) */
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void misdn_lib_release(struct misdn_bchannel *bc)
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{
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int channel;
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struct misdn_stack *stack=get_stack_by_bc(bc);
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if (!stack) {
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@ -1821,11 +1831,12 @@ void misdn_lib_release(struct misdn_bchannel *bc)
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return;
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}
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if (bc->channel>0)
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empty_chan_in_stack(stack,bc->channel);
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channel = bc->channel;
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empty_bc(bc);
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clean_up_bc(bc);
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if (channel > 0) {
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empty_chan_in_stack(stack, channel);
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}
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bc->in_use=0;
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}
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@ -2871,20 +2882,18 @@ static int handle_frm(msg_t *msg)
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bc->cause = tmpcause;
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bc->out_cause = tmp_out_cause;
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clean_up_bc(bc);
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bc->in_use = 0;
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if (tmpcause == AST_CAUSE_REQUESTED_CHAN_UNAVAIL) {
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cb_log(0, stack->port, "**** Received CAUSE:%d, so not cleaning up channel %d\n", AST_CAUSE_REQUESTED_CHAN_UNAVAIL, channel);
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cb_log(0, stack->port, "**** This channel is now no longer available,\nplease try to restart it with 'misdn send restart <port> <channel>'\n");
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set_chan_in_stack(stack, channel);
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bc->channel = channel;
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cb_log(0, stack->port, "**** Received CAUSE:%d, restarting channel %d\n", AST_CAUSE_REQUESTED_CHAN_UNAVAIL, channel);
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misdn_lib_send_restart(stack->port, channel);
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} else if (channel > 0) {
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}
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if (channel > 0) {
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empty_chan_in_stack(stack, channel);
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}
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bc->in_use = 0;
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break;
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case EVENT_RESTART:
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cb_log(0, stack->port, "**** Received RESTART_ACK channel:%d\n", bc->restart_channel);
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cb_log(0, stack->port, "**** Received RESTART channel:%d\n", bc->restart_channel);
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empty_chan_in_stack(stack, bc->restart_channel);
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break;
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default:
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@ -3246,11 +3255,12 @@ struct misdn_bchannel *manager_find_bc_by_pid(int pid)
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struct misdn_stack *stack;
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int i;
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for (stack=glob_mgr->stack_list;
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stack;
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stack=stack->next) {
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for (i=0; i<=stack->b_num; i++)
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if (stack->bc[i].pid == pid) return &stack->bc[i];
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for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
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for (i = 0; i <= stack->b_num; i++) {
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if (stack->bc[i].in_use && stack->bc[i].pid == pid) {
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return &stack->bc[i];
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}
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}
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}
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return NULL;
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@ -3282,7 +3292,6 @@ static void prepare_bc(struct misdn_bchannel*bc, int channel)
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{
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bc->channel = channel;
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bc->channel_preselected = channel?1:0;
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bc->in_use = 1;
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bc->need_disconnect=1;
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bc->need_release=1;
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bc->need_release_complete=1;
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@ -3296,6 +3305,8 @@ static void prepare_bc(struct misdn_bchannel*bc, int channel)
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bc->b_stid=0;
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bc->layer_id=0;
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#endif
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bc->in_use = 1;
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}
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struct misdn_bchannel *misdn_lib_get_free_bc(int port, int channel, int inout, int dec)
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return NULL;
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}
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usleep(1000);
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/* Find the port stack structure */
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stack = find_stack_by_port(port);
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if (!stack) {
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return NULL;
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}
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pthread_mutex_lock(&stack->st_lock);
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if (channel > 0) {
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if (channel <= stack->b_num) {
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for (i = 0; i < stack->b_num; i++) {
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if (stack->bc[i].channel == channel) {
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if (test_inuse(&stack->bc[i])) {
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pthread_mutex_unlock(&stack->st_lock);
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cb_log(0, port, "Requested channel:%d on port:%d is already in use\n", channel, port);
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return NULL;
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} else {
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prepare_bc(&stack->bc[i], channel);
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pthread_mutex_unlock(&stack->st_lock);
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return &stack->bc[i];
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}
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}
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}
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} else {
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pthread_mutex_unlock(&stack->st_lock);
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cb_log(0, port, "Requested channel:%d is out of bounds on port:%d\n", channel, port);
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return NULL;
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}
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@ -3354,6 +3367,7 @@ struct misdn_bchannel *misdn_lib_get_free_bc(int port, int channel, int inout, i
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prepare_bc(&stack->bc[i], channel);
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stack->bc[i].dec = 1;
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pthread_mutex_unlock(&stack->st_lock);
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return &stack->bc[i];
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}
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}
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}
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prepare_bc(&stack->bc[i], channel);
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pthread_mutex_unlock(&stack->st_lock);
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return &stack->bc[i];
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}
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}
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}
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pthread_mutex_unlock(&stack->st_lock);
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cb_log(1, port, "There is no free channel on port (%d)\n", port);
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return NULL;
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return NULL;
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}
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pthread_mutex_lock(&stack->st_lock);
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for (index = MAX_BCHANS + 1; index < ARRAY_LEN(stack->bc); ++index) {
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bc = &stack->bc[index];
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if (!test_inuse(bc)) {
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prepare_bc(bc, 0);
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bc->need_disconnect = 0;
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bc->need_release = 0;
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pthread_mutex_unlock(&stack->st_lock);
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return bc;
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}
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}
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pthread_mutex_unlock(&stack->st_lock);
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cb_log(1, port, "There is no free REGISTER link on port (%d)\n", port);
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return NULL;
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/* clean up chan in stack, to be sure we don't think it's
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* in use anymore */
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for (cnt=0; cnt<=stack->b_num; cnt++) {
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if (stack->bc[cnt].channel == channel) {
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if (stack->bc[cnt].in_use && stack->bc[cnt].channel == channel) {
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empty_bc(&stack->bc[cnt]);
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clean_up_bc(&stack->bc[cnt]);
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stack->bc[cnt].in_use=0;
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@ -67,6 +67,9 @@ struct misdn_stack {
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manager_t mgr;
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pthread_mutex_t nstlock;
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/*! \brief Stack struct critical section lock. */
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pthread_mutex_t st_lock;
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/*! \brief D Channel mISDN driver stack ID (Parent stack ID) */
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int d_stid;
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@ -134,7 +137,7 @@ struct misdn_stack {
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*/
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char channels[MAX_BCHANS + 1 + MISDN_MAX_REGISTER_LINKS];
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/*! \brief List of holded channels */
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/*! \brief List of held channels */
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struct misdn_bchannel *holding;
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/*! \brief Next stack in the list of stacks */
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