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-rw-r--r--net/rxrpc/ar-call.c787
1 files changed, 787 insertions, 0 deletions
diff --git a/net/rxrpc/ar-call.c b/net/rxrpc/ar-call.c
new file mode 100644
index 000000000000..ac31cceda2f1
--- /dev/null
+++ b/net/rxrpc/ar-call.c
@@ -0,0 +1,787 @@
+/* RxRPC individual remote procedure call handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/circ_buf.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+struct kmem_cache *rxrpc_call_jar;
+LIST_HEAD(rxrpc_calls);
+DEFINE_RWLOCK(rxrpc_call_lock);
+static unsigned rxrpc_call_max_lifetime = 60;
+static unsigned rxrpc_dead_call_timeout = 10;
+
+static void rxrpc_destroy_call(struct work_struct *work);
+static void rxrpc_call_life_expired(unsigned long _call);
+static void rxrpc_dead_call_expired(unsigned long _call);
+static void rxrpc_ack_time_expired(unsigned long _call);
+static void rxrpc_resend_time_expired(unsigned long _call);
+
+/*
+ * allocate a new call
+ */
+static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
+{
+ struct rxrpc_call *call;
+
+ call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
+ if (!call)
+ return NULL;
+
+ call->acks_winsz = 16;
+ call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long),
+ gfp);
+ if (!call->acks_window) {
+ kmem_cache_free(rxrpc_call_jar, call);
+ return NULL;
+ }
+
+ setup_timer(&call->lifetimer, &rxrpc_call_life_expired,
+ (unsigned long) call);
+ setup_timer(&call->deadspan, &rxrpc_dead_call_expired,
+ (unsigned long) call);
+ setup_timer(&call->ack_timer, &rxrpc_ack_time_expired,
+ (unsigned long) call);
+ setup_timer(&call->resend_timer, &rxrpc_resend_time_expired,
+ (unsigned long) call);
+ INIT_WORK(&call->destroyer, &rxrpc_destroy_call);
+ INIT_WORK(&call->processor, &rxrpc_process_call);
+ INIT_LIST_HEAD(&call->accept_link);
+ skb_queue_head_init(&call->rx_queue);
+ skb_queue_head_init(&call->rx_oos_queue);
+ init_waitqueue_head(&call->tx_waitq);
+ spin_lock_init(&call->lock);
+ rwlock_init(&call->state_lock);
+ atomic_set(&call->usage, 1);
+ call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
+
+ memset(&call->sock_node, 0xed, sizeof(call->sock_node));
+
+ call->rx_data_expect = 1;
+ call->rx_data_eaten = 0;
+ call->rx_first_oos = 0;
+ call->ackr_win_top = call->rx_data_eaten + 1 + RXRPC_MAXACKS;
+ call->creation_jif = jiffies;
+ return call;
+}
+
+/*
+ * allocate a new client call and attempt to to get a connection slot for it
+ */
+static struct rxrpc_call *rxrpc_alloc_client_call(
+ struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ struct rxrpc_conn_bundle *bundle,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call;
+ int ret;
+
+ _enter("");
+
+ ASSERT(rx != NULL);
+ ASSERT(trans != NULL);
+ ASSERT(bundle != NULL);
+
+ call = rxrpc_alloc_call(gfp);
+ if (!call)
+ return ERR_PTR(-ENOMEM);
+
+ sock_hold(&rx->sk);
+ call->socket = rx;
+ call->rx_data_post = 1;
+
+ ret = rxrpc_connect_call(rx, trans, bundle, call, gfp);
+ if (ret < 0) {
+ kmem_cache_free(rxrpc_call_jar, call);
+ return ERR_PTR(ret);
+ }
+
+ spin_lock(&call->conn->trans->peer->lock);
+ list_add(&call->error_link, &call->conn->trans->peer->error_targets);
+ spin_unlock(&call->conn->trans->peer->lock);
+
+ call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ;
+ add_timer(&call->lifetimer);
+
+ _leave(" = %p", call);
+ return call;
+}
+
+/*
+ * set up a call for the given data
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ struct rxrpc_conn_bundle *bundle,
+ unsigned long user_call_ID,
+ int create,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call, *candidate;
+ struct rb_node *p, *parent, **pp;
+
+ _enter("%p,%d,%d,%lx,%d",
+ rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1,
+ user_call_ID, create);
+
+ /* search the extant calls first for one that matches the specified
+ * user ID */
+ read_lock(&rx->call_lock);
+
+ p = rx->calls.rb_node;
+ while (p) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ p = p->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ p = p->rb_right;
+ else
+ goto found_extant_call;
+ }
+
+ read_unlock(&rx->call_lock);
+
+ if (!create || !trans)
+ return ERR_PTR(-EBADSLT);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp);
+ if (IS_ERR(candidate)) {
+ _leave(" = %ld", PTR_ERR(candidate));
+ return candidate;
+ }
+
+ candidate->user_call_ID = user_call_ID;
+ __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags);
+
+ write_lock(&rx->call_lock);
+
+ pp = &rx->calls.rb_node;
+ parent = NULL;
+ while (*pp) {
+ parent = *pp;
+ call = rb_entry(parent, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ pp = &(*pp)->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ pp = &(*pp)->rb_right;
+ else
+ goto found_extant_second;
+ }
+
+ /* second search also failed; add the new call */
+ call = candidate;
+ candidate = NULL;
+ rxrpc_get_call(call);
+
+ rb_link_node(&call->sock_node, parent, pp);
+ rb_insert_color(&call->sock_node, &rx->calls);
+ write_unlock(&rx->call_lock);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_add_tail(&call->link, &rxrpc_calls);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+ _leave(" = %p [new]", call);
+ return call;
+
+ /* we found the call in the list immediately */
+found_extant_call:
+ rxrpc_get_call(call);
+ read_unlock(&rx->call_lock);
+ _leave(" = %p [extant %d]", call, atomic_read(&call->usage));
+ return call;
+
+ /* we found the call on the second time through the list */
+found_extant_second:
+ rxrpc_get_call(call);
+ write_unlock(&rx->call_lock);
+ rxrpc_put_call(candidate);
+ _leave(" = %p [second %d]", call, atomic_read(&call->usage));
+ return call;
+}
+
+/*
+ * set up an incoming call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
+ struct rxrpc_connection *conn,
+ struct rxrpc_header *hdr,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call, *candidate;
+ struct rb_node **p, *parent;
+ __be32 call_id;
+
+ _enter(",%d,,%x", conn->debug_id, gfp);
+
+ ASSERT(rx != NULL);
+
+ candidate = rxrpc_alloc_call(gfp);
+ if (!candidate)
+ return ERR_PTR(-EBUSY);
+
+ candidate->socket = rx;
+ candidate->conn = conn;
+ candidate->cid = hdr->cid;
+ candidate->call_id = hdr->callNumber;
+ candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK;
+ candidate->rx_data_post = 0;
+ candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
+ if (conn->security_ix > 0)
+ candidate->state = RXRPC_CALL_SERVER_SECURING;
+
+ write_lock_bh(&conn->lock);
+
+ /* set the channel for this call */
+ call = conn->channels[candidate->channel];
+ _debug("channel[%u] is %p", candidate->channel, call);
+ if (call && call->call_id == hdr->callNumber) {
+ /* already set; must've been a duplicate packet */
+ _debug("extant call [%d]", call->state);
+ ASSERTCMP(call->conn, ==, conn);
+
+ read_lock(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+ schedule_work(&call->processor);
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ read_unlock(&call->state_lock);
+ goto aborted_call;
+ default:
+ rxrpc_get_call(call);
+ read_unlock(&call->state_lock);
+ goto extant_call;
+ }
+ }
+
+ if (call) {
+ /* it seems the channel is still in use from the previous call
+ * - ditch the old binding if its call is now complete */
+ _debug("CALL: %u { %s }",
+ call->debug_id, rxrpc_call_states[call->state]);
+
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ conn->channels[call->channel] = NULL;
+ } else {
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -EBUSY");
+ return ERR_PTR(-EBUSY);
+ }
+ }
+
+ /* check the call number isn't duplicate */
+ _debug("check dup");
+ call_id = hdr->callNumber;
+ p = &conn->calls.rb_node;
+ parent = NULL;
+ while (*p) {
+ parent = *p;
+ call = rb_entry(parent, struct rxrpc_call, conn_node);
+
+ if (call_id < call->call_id)
+ p = &(*p)->rb_left;
+ else if (call_id > call->call_id)
+ p = &(*p)->rb_right;
+ else
+ goto old_call;
+ }
+
+ /* make the call available */
+ _debug("new call");
+ call = candidate;
+ candidate = NULL;
+ rb_link_node(&call->conn_node, parent, p);
+ rb_insert_color(&call->conn_node, &conn->calls);
+ conn->channels[call->channel] = call;
+ sock_hold(&rx->sk);
+ atomic_inc(&conn->usage);
+ write_unlock_bh(&conn->lock);
+
+ spin_lock(&conn->trans->peer->lock);
+ list_add(&call->error_link, &conn->trans->peer->error_targets);
+ spin_unlock(&conn->trans->peer->lock);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_add_tail(&call->link, &rxrpc_calls);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+ call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ;
+ add_timer(&call->lifetimer);
+ _leave(" = %p {%d} [new]", call, call->debug_id);
+ return call;
+
+extant_call:
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1);
+ return call;
+
+aborted_call:
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -ECONNABORTED");
+ return ERR_PTR(-ECONNABORTED);
+
+old_call:
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -ECONNRESET [old]");
+ return ERR_PTR(-ECONNRESET);
+}
+
+/*
+ * find an extant server call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx,
+ unsigned long user_call_ID)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("%p,%lx", rx, user_call_ID);
+
+ /* search the extant calls for one that matches the specified user
+ * ID */
+ read_lock(&rx->call_lock);
+
+ p = rx->calls.rb_node;
+ while (p) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ p = p->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ p = p->rb_right;
+ else
+ goto found_extant_call;
+ }
+
+ read_unlock(&rx->call_lock);
+ _leave(" = NULL");
+ return NULL;
+
+ /* we found the call in the list immediately */
+found_extant_call:
+ rxrpc_get_call(call);
+ read_unlock(&rx->call_lock);
+ _leave(" = %p [%d]", call, atomic_read(&call->usage));
+ return call;
+}
+
+/*
+ * detach a call from a socket and set up for release
+ */
+void rxrpc_release_call(struct rxrpc_call *call)
+{
+ struct rxrpc_sock *rx = call->socket;
+
+ _enter("{%d,%d,%d,%d}",
+ call->debug_id, atomic_read(&call->usage),
+ atomic_read(&call->ackr_not_idle),
+ call->rx_first_oos);
+
+ spin_lock_bh(&call->lock);
+ if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
+ BUG();
+ spin_unlock_bh(&call->lock);
+
+ /* dissociate from the socket
+ * - the socket's ref on the call is passed to the death timer
+ */
+ _debug("RELEASE CALL %p (%d CONN %p)",
+ call, call->debug_id, call->conn);
+
+ write_lock_bh(&rx->call_lock);
+ if (!list_empty(&call->accept_link)) {
+ _debug("unlinking once-pending call %p { e=%lx f=%lx }",
+ call, call->events, call->flags);
+ ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+ list_del_init(&call->accept_link);
+ sk_acceptq_removed(&rx->sk);
+ } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+ rb_erase(&call->sock_node, &rx->calls);
+ memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
+ clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+ }
+ write_unlock_bh(&rx->call_lock);
+
+ if (call->conn->out_clientflag)
+ spin_lock(&call->conn->trans->client_lock);
+ write_lock_bh(&call->conn->lock);
+
+ /* free up the channel for reuse */
+ if (call->conn->out_clientflag) {
+ call->conn->avail_calls++;
+ if (call->conn->avail_calls == RXRPC_MAXCALLS)
+ list_move_tail(&call->conn->bundle_link,
+ &call->conn->bundle->unused_conns);
+ else if (call->conn->avail_calls == 1)
+ list_move_tail(&call->conn->bundle_link,
+ &call->conn->bundle->avail_conns);
+ }
+
+ write_lock(&call->state_lock);
+ if (call->conn->channels[call->channel] == call)
+ call->conn->channels[call->channel] = NULL;
+
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
+ _debug("+++ ABORTING STATE %d +++\n", call->state);
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_CALL_DEAD;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ schedule_work(&call->processor);
+ }
+ write_unlock(&call->state_lock);
+ write_unlock_bh(&call->conn->lock);
+ if (call->conn->out_clientflag)
+ spin_unlock(&call->conn->trans->client_lock);
+
+ if (!skb_queue_empty(&call->rx_queue) ||
+ !skb_queue_empty(&call->rx_oos_queue)) {
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+
+ _debug("purge Rx queues");
+
+ spin_lock_bh(&call->lock);
+ while ((skb = skb_dequeue(&call->rx_queue)) ||
+ (skb = skb_dequeue(&call->rx_oos_queue))) {
+ sp = rxrpc_skb(skb);
+ if (sp->call) {
+ ASSERTCMP(sp->call, ==, call);
+ rxrpc_put_call(call);
+ sp->call = NULL;
+ }
+ skb->destructor = NULL;
+ spin_unlock_bh(&call->lock);
+
+ _debug("- zap %s %%%u #%u",
+ rxrpc_pkts[sp->hdr.type],
+ ntohl(sp->hdr.serial),
+ ntohl(sp->hdr.seq));
+ rxrpc_free_skb(skb);
+ spin_lock_bh(&call->lock);
+ }
+ spin_unlock_bh(&call->lock);
+
+ ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
+ }
+
+ del_timer_sync(&call->resend_timer);
+ del_timer_sync(&call->ack_timer);
+ del_timer_sync(&call->lifetimer);
+ call->deadspan.expires = jiffies + rxrpc_dead_call_timeout * HZ;
+ add_timer(&call->deadspan);
+
+ _leave("");
+}
+
+/*
+ * handle a dead call being ready for reaping
+ */
+static void rxrpc_dead_call_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ write_lock_bh(&call->state_lock);
+ call->state = RXRPC_CALL_DEAD;
+ write_unlock_bh(&call->state_lock);
+ rxrpc_put_call(call);
+}
+
+/*
+ * mark a call as to be released, aborting it if it's still in progress
+ * - called with softirqs disabled
+ */
+static void rxrpc_mark_call_released(struct rxrpc_call *call)
+{
+ bool sched;
+
+ write_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD) {
+ sched = false;
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ _debug("abort call %p", call);
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_CALL_DEAD;
+ if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+ sched = true;
+ }
+ if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ sched = true;
+ if (sched)
+ schedule_work(&call->processor);
+ }
+ write_unlock(&call->state_lock);
+}
+
+/*
+ * release all the calls associated with a socket
+ */
+void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("%p", rx);
+
+ read_lock_bh(&rx->call_lock);
+
+ /* mark all the calls as no longer wanting incoming packets */
+ for (p = rb_first(&rx->calls); p; p = rb_next(p)) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+ rxrpc_mark_call_released(call);
+ }
+
+ /* kill the not-yet-accepted incoming calls */
+ list_for_each_entry(call, &rx->secureq, accept_link) {
+ rxrpc_mark_call_released(call);
+ }
+
+ list_for_each_entry(call, &rx->acceptq, accept_link) {
+ rxrpc_mark_call_released(call);
+ }
+
+ read_unlock_bh(&rx->call_lock);
+ _leave("");
+}
+
+/*
+ * release a call
+ */
+void __rxrpc_put_call(struct rxrpc_call *call)
+{
+ ASSERT(call != NULL);
+
+ _enter("%p{u=%d}", call, atomic_read(&call->usage));
+
+ ASSERTCMP(atomic_read(&call->usage), >, 0);
+
+ if (atomic_dec_and_test(&call->usage)) {
+ _debug("call %d dead", call->debug_id);
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ schedule_work(&call->destroyer);
+ }
+ _leave("");
+}
+
+/*
+ * clean up a call
+ */
+static void rxrpc_cleanup_call(struct rxrpc_call *call)
+{
+ _net("DESTROY CALL %d", call->debug_id);
+
+ ASSERT(call->socket);
+
+ memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
+
+ del_timer_sync(&call->lifetimer);
+ del_timer_sync(&call->deadspan);
+ del_timer_sync(&call->ack_timer);
+ del_timer_sync(&call->resend_timer);
+
+ ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
+ ASSERTCMP(call->events, ==, 0);
+ if (work_pending(&call->processor)) {
+ _debug("defer destroy");
+ schedule_work(&call->destroyer);
+ return;
+ }
+
+ if (call->conn) {
+ spin_lock(&call->conn->trans->peer->lock);
+ list_del(&call->error_link);
+ spin_unlock(&call->conn->trans->peer->lock);
+
+ write_lock_bh(&call->conn->lock);
+ rb_erase(&call->conn_node, &call->conn->calls);
+ write_unlock_bh(&call->conn->lock);
+ rxrpc_put_connection(call->conn);
+ }
+
+ if (call->acks_window) {
+ _debug("kill Tx window %d",
+ CIRC_CNT(call->acks_head, call->acks_tail,
+ call->acks_winsz));
+ smp_mb();
+ while (CIRC_CNT(call->acks_head, call->acks_tail,
+ call->acks_winsz) > 0) {
+ struct rxrpc_skb_priv *sp;
+ unsigned long _skb;
+
+ _skb = call->acks_window[call->acks_tail] & ~1;
+ sp = rxrpc_skb((struct sk_buff *) _skb);
+ _debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
+ rxrpc_free_skb((struct sk_buff *) _skb);
+ call->acks_tail =
+ (call->acks_tail + 1) & (call->acks_winsz - 1);
+ }
+
+ kfree(call->acks_window);
+ }
+
+ rxrpc_free_skb(call->tx_pending);
+
+ rxrpc_purge_queue(&call->rx_queue);
+ ASSERT(skb_queue_empty(&call->rx_oos_queue));
+ sock_put(&call->socket->sk);
+ kmem_cache_free(rxrpc_call_jar, call);
+}
+
+/*
+ * destroy a call
+ */
+static void rxrpc_destroy_call(struct work_struct *work)
+{
+ struct rxrpc_call *call =
+ container_of(work, struct rxrpc_call, destroyer);
+
+ _enter("%p{%d,%d,%p}",
+ call, atomic_read(&call->usage), call->channel, call->conn);
+
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_del_init(&call->link);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ rxrpc_cleanup_call(call);
+ _leave("");
+}
+
+/*
+ * preemptively destroy all the call records from a transport endpoint rather
+ * than waiting for them to time out
+ */
+void __exit rxrpc_destroy_all_calls(void)
+{
+ struct rxrpc_call *call;
+
+ _enter("");
+ write_lock_bh(&rxrpc_call_lock);
+
+ while (!list_empty(&rxrpc_calls)) {
+ call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
+ _debug("Zapping call %p", call);
+
+ list_del_init(&call->link);
+
+ switch (atomic_read(&call->usage)) {
+ case 0:
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ break;
+ case 1:
+ if (del_timer_sync(&call->deadspan) != 0 &&
+ call->state != RXRPC_CALL_DEAD)
+ rxrpc_dead_call_expired((unsigned long) call);
+ if (call->state != RXRPC_CALL_DEAD)
+ break;
+ default:
+ printk(KERN_ERR "RXRPC:"
+ " Call %p still in use (%d,%d,%s,%lx,%lx)!\n",
+ call, atomic_read(&call->usage),
+ atomic_read(&call->ackr_not_idle),
+ rxrpc_call_states[call->state],
+ call->flags, call->events);
+ if (!skb_queue_empty(&call->rx_queue))
+ printk(KERN_ERR"RXRPC: Rx queue occupied\n");
+ if (!skb_queue_empty(&call->rx_oos_queue))
+ printk(KERN_ERR"RXRPC: OOS queue occupied\n");
+ break;
+ }
+
+ write_unlock_bh(&rxrpc_call_lock);
+ cond_resched();
+ write_lock_bh(&rxrpc_call_lock);
+ }
+
+ write_unlock_bh(&rxrpc_call_lock);
+ _leave("");
+}
+
+/*
+ * handle call lifetime being exceeded
+ */
+static void rxrpc_call_life_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ _enter("{%d}", call->debug_id);
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ set_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
+ schedule_work(&call->processor);
+ }
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * handle resend timer expiry
+ */
+static void rxrpc_resend_time_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ read_lock_bh(&call->state_lock);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+ schedule_work(&call->processor);
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * handle ACK timer expiry
+ */
+static void rxrpc_ack_time_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_ACK, &call->events))
+ schedule_work(&call->processor);
+ read_unlock_bh(&call->state_lock);
+}

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