// SPDX-License-Identifier: GPL-2.0-or-later
/* RxRPC individual remote procedure call handling
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/circ_buf.h>
#include <linux/spinlock_types.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"
const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
[RXRPC_CALL_UNINITIALISED] = "Uninit ",
[RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
[RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
[RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
[RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
[RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
[RXRPC_CALL_SERVER_SECURING] = "SvSecure",
[RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
[RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
[RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
[RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
[RXRPC_CALL_COMPLETE] = "Complete",
};
const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
[RXRPC_CALL_SUCCEEDED] = "Complete",
[RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
[RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
[RXRPC_CALL_LOCAL_ERROR] = "LocError",
[RXRPC_CALL_NETWORK_ERROR] = "NetError",
};
struct kmem_cache *rxrpc_call_jar;
static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
{
struct rxrpc_local *local = call->local;
bool busy;
if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
spin_lock_bh(&local->lock);
busy = !list_empty(&call->attend_link);
trace_rxrpc_poke_call(call, busy, what);
if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
busy = true;
if (!busy) {
list_add_tail(&call->attend_link, &local->call_attend_q);
}
spin_unlock_bh(&local->lock);
if (!busy)
rxrpc_wake_up_io_thread(local);
}
}
static void rxrpc_call_timer_expired(struct timer_list *t)
{
struct rxrpc_call *call = from_timer(call, t, timer);
_enter("%d", call->debug_id);
if (!__rxrpc_call_is_complete(call)) {
trace_rxrpc_timer_expired(call);
rxrpc_poke_call(call, rxrpc_call_poke_timer);
}
}
static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
static void rxrpc_destroy_call(struct work_struct *);
/*
* find an extant server call
* - called in process context with IRQs enabled
*/
struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
unsigned long user_call_ID)
{
struct rxrpc_call *call;
struct rb_node *p;
_enter("%p,%lx", rx, user_call_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;
found_extant_call:
rxrpc_get_call(call, rxrpc_call_get_sendmsg);
read_unlock(&rx->call_lock);
_leave(" = %p [%d]", call, refcount_read(&call->ref));
return call;
}
/*
* allocate a new call
*/
struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
unsigned int debug_id)
{
struct rxrpc_call *call;
struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
if (!call)
return NULL;
mutex_init(&call->user_mutex);
/* Prevent lockdep reporting a deadlock false positive between the afs
* filesystem and sys_sendmsg() via the mmap sem.
*/
if (rx->sk.sk_kern_sock)
lockdep_set_class(&call->user_mutex,
&rxrpc_call_user_mutex_lock_class_key);
timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
INIT_WORK(&call->destroyer, rxrpc_destroy_call);
INIT_LIST_HEAD(&call->link);
INIT_LIST_HEAD(&call->wait_link);
INIT_LIST_HEAD(&call->accept_link);
INIT_LIST_HEAD(&call->recvmsg_link);
INIT_LIST_HEAD(&call->sock_link);
INIT_LIST_HEAD(&call->attend_link);
INIT_LIST_HEAD(&call->tx_sendmsg);
INIT_LIST_HEAD(&call->tx_buffer);
skb_queue_head_init(&call->recvmsg_queue);
skb_queue_head_init(&call->rx_oos_queue);
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->notify_lock);
spin_lock_init(&call->tx_lock);
refcount_set(&call->ref, 1);
call->debug_id = debug_id;
call->tx_total_len = -1;
call->next_rx_timo = 20 * HZ;
call->next_req_timo = 1 * HZ;
call->ackr_window = 1;
call->ackr_wtop = 1;
call->delay_ack_at = KTIME_MAX;
call->ack_lost_at = KTIME_MAX;
call->resend_at = KTIME_MAX;
call->ping_at = KTIME_MAX;
call->keepalive_at = KTIME_MAX;
call->expect_rx_by = KTIME_MAX;
call->expect_req_by = KTIME_MAX;
call->expect_term_by = KTIME_MAX;
memset(&call->sock_node, 0xed, sizeof(call->sock_node));
call->rx_winsize = rxrpc_rx_window_size;
call->tx_winsize = 16;
call->cong_cwnd = RXRPC_MIN_CWND;
call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
call->rxnet = rxnet;
call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
atomic_inc(&rxnet->nr_calls);
return call;
}
/*
* Allocate a new client call.
*/
static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
struct rxrpc_call_params *p,
gfp_t gfp,
unsigned int debug_id)
{
struct rxrpc_call *call;
ktime_t now;
int ret;
_enter("");
call = rxrpc_alloc_call(rx, gfp, debug_id);
if (!call)
return ERR_PTR(-ENOMEM);
now = ktime_get_real();
call->acks_latest_ts = now;
call->cong_tstamp = now;
call->dest_srx = cp->peer->srx;
call->dest_srx.srx_service = cp->service_id;
call->interruptibility = p->interruptibility;
call->tx_total_len = p->tx_total_len;
call->key = key_get(cp->key);
call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call);
call->security_level = cp->security_level;
if (p->kernel)
__set_bit(RXRPC_CALL_KERNEL, &call->flags);
if (cp->upgrade)
__set_bit(RXRPC_CALL_UPGRADE, &call->flags);
if (cp->exclusive)
__set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
if (p->timeouts.normal)
call->next_rx_timo = min(p->timeouts.normal, 1);
if (p->timeouts.idle)
call->next_req_timo = min(p->timeouts.idle, 1);
if (p->timeouts.hard)
call->hard_timo = p->timeouts.hard;
ret = rxrpc_init_client_call_security(call);
if (ret < 0) {
rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
rxrpc_put_call(call, rxrpc_call_put_discard_error);
return ERR_PTR(ret);
}
rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
p->user_call_ID, rxrpc_call_new_client);
_leave(" = %p", call);
return call;
}
/*
* Initiate the call ack/resend/expiry timer.
*/
void rxrpc_start_call_timer(struct rxrpc_call *call)
{
if (call->hard_timo) {
ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
call->expect_term_by = ktime_add(ktime_get_real(), delay);
trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
}
call->timer.expires = jiffies;
}
/*
* Wait for a call slot to become available.
*/
static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
{
struct semaphore *limiter = &rxrpc_call_limiter;
if (p->kernel)
limiter = &rxrpc_kernel_call_limiter;
if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
down(limiter);
return limiter;
}
return down_interruptible(limiter) < 0 ? NULL : limiter;
}
/*
* Release a call slot.
*/
static void rxrpc_put_call_slot(struct rxrpc_call *call)
{
struct semaphore *limiter = &rxrpc_call_limiter;
if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
limiter = &rxrpc_kernel_call_limiter;
up(limiter);
}
/*
* Start the process of connecting a call. We obtain a peer and a connection
* bundle, but the actual association of a call with a connection is offloaded
* to the I/O thread to simplify locking.
*/
static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
{
struct rxrpc_local *local = call->local;
int ret = -ENOMEM;
_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
ret = rxrpc_look_up_bundle(call, gfp);
if (ret < 0)
goto error;
trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
rxrpc_get_call(call, rxrpc_call_get_io_thread);
spin_lock(&local->client_call_lock);
list_add_tail(&call->wait_link, &local->new_client_calls);
spin_unlock(&local->client_call_lock);
rxrpc_wake_up_io_thread(local);
return 0;
error:
__set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
return ret;
}
/*
* Set up a call for the given parameters.
* - Called with the socket lock held, which it must release.
* - If it returns a call, the call's lock will need releasing by the caller.
*/
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
struct rxrpc_call_params *p,
gfp_t gfp,
unsigned int debug_id)
__releases(&rx->sk.sk_lock.slock)
__acquires(&call->user_mutex)
{
struct rxrpc_call *call, *xcall;
struct rxrpc_net *rxnet;
struct semaphore *limiter;
struct rb_node *parent, **pp;
int ret;
_enter("%p,%lx", rx, p->user_call_ID);
if (WARN_ON_ONCE(!cp->peer)) {
release_sock(&rx->sk);
return ERR_PTR(-EIO);
}
limiter = rxrpc_get_call_slot(p, gfp);
if (!limiter) {
release_sock(&rx->sk);
return ERR_PTR(-ERESTARTSYS);
}
call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
if (IS_ERR(call)) {
release_sock(&rx->sk);
up(limiter);
_leave(" = %ld", PTR_ERR(call));
return call;
}
/* We need to protect a partially set up call against the user as we
* will be acting outside the socket lock.
*/
mutex_lock(&call->user_mutex);
/* Publish the call, even though it is incompletely set up as yet */
write_lock(&rx->call_lock);
pp = &rx->calls.rb_node;
parent = NULL;
while (*pp) {
parent = *pp;
xcall = rb_entry(parent, struct rxrpc_call, sock_node);
if (p->user_call_ID < xcall->user_call_ID)
pp = &(*pp)->rb_left;
else if (p->user_call_ID > xcall->user_call_ID)
pp = &(*pp)->rb_right;
else
goto error_dup_user_ID;
}
rcu_assign_pointer(call->socket, rx);
call->user_call_ID = p->user_call_ID;
__set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
rxrpc_get_call(call, rxrpc_call_get_userid);
rb_link_node(&call->sock_node, parent, pp);
rb_insert_color(&call->sock_node, &rx->calls);
list_add(&call->sock_link, &rx->sock_calls);
write_unlock(&rx->call_lock);
rxnet = call->rxnet;
spin_lock(&rxnet->call_lock);
list_add_tail_rcu(&call->link, &rxnet->calls);
spin_unlock(&rxnet->call_lock);
/* From this point on, the call is protected by its own lock. */
release_sock(&rx->sk);
/* Set up or get a connection record and set the protocol parameters,
* including channel number and call ID.
*/
ret = rxrpc_connect_call(call, gfp);
if (ret < 0)
goto error_attached_to_socket;
_leave(" = %p [new]", call);
return call;
/* We unexpectedly found the user ID in the list after taking
* the call_lock. This shouldn't happen unless the user races
* with itself and tries to add the same user ID twice at the
* same time in different threads.
*/
error_dup_user_ID:
write_unlock(&rx->call_lock);
release_sock(&rx->sk);
rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
rxrpc_call_see_userid_exists);
mutex_unlock(&call->user_mutex);
rxrpc_put_call(call, rxrpc_call_put_userid_exists);
_leave(" = -EEXIST");
return ERR_PTR(-EEXIST);
/* We got an error, but the call is attached to the socket and is in
* need of release. However, we might now race with recvmsg() when it
* completion notifies the socket. Return 0 from sys_sendmsg() and
* leave the error to recvmsg() to deal with.
*/
error_attached_to_socket:
trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
rxrpc_call_see_connect_failed);
rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
_leave(" = c=%08x [err]", call->debug_id);
return call;
}
/*
* Set up an incoming call. call->conn points to the connection.
* This is called in BH context and isn't allowed to fail.
*/
void rxrpc_incoming_call(struct rxrpc_sock *rx,
struct rxrpc_call *call,
struct sk_buff *skb)
{
struct rxrpc_connection *conn = call->conn;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
u32 chan;
_enter(",%d", call->conn->debug_id);
rcu_assign_pointer(call->socket, rx);
call->call_id = sp->hdr.callNumber;
call->dest_srx.srx_service = sp->hdr.serviceId;
call->cid = sp->hdr.cid;
call->cong_tstamp = skb->tstamp;
__set_bit(RXRPC_CALL_EXPOSED, &call->flags);
rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
spin_lock(&conn->state_lock);
switch (conn->state) {
case RXRPC_CONN_SERVICE_UNSECURED:
case RXRPC_CONN_SERVICE_CHALLENGING:
rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
break;
case RXRPC_CONN_SERVICE:
rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
break;
case RXRPC_CONN_ABORTED:
rxrpc_set_call_completion(call, conn->completion,
conn->abort_code, conn->error);
break;
default:
BUG();
}
rxrpc_get_call(call, rxrpc_call_get_io_thread);
/* Set the channel for this call. We don't get channel_lock as we're
* only defending against the data_ready handler (which we're called
* from) and the RESPONSE packet parser (which is only really
* interested in call_counter and can cope with a disagreement with the
* call pointer).
*/
chan = sp->hdr.cid & RXRPC_CHANNELMASK;
conn->channels[chan].call_counter = call->call_id;
conn->channels[chan].call_id = call->call_id;
conn->channels[chan].call = call;
spin_unlock(&conn->state_lock);
spin_lock(&conn->peer->lock);
hlist_add_head(&call->error_link, &conn->peer->error_targets);
spin_unlock(&conn->peer->lock);
rxrpc_start_call_timer(call);
_leave("");
}
/*
* Note the re-emergence of a call.
*/
void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
{
if (call) {
int r = refcount_read(&call->ref);
trace_rxrpc_call(call->debug_id, r, 0, why);
}
}
struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
enum rxrpc_call_trace why)
{
int r;
if (!call || !__refcount_inc_not_zero(&call->ref, &r))
return NULL;
trace_rxrpc_call(call->debug_id, r + 1, 0, why);
return call;
}
/*
* Note the addition of a ref on a call.
*/
void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
{
int r;
__refcount_inc(&call->ref, &r);
trace_rxrpc_call(call->debug_id, r + 1, 0, why);
}
/*
* Clean up the Rx skb ring.
*/
static void rxrpc_cleanup_ring(struct rxrpc_call *call)
{
rxrpc_purge_queue(&call->recvmsg_queue);
rxrpc_purge_queue(&call->rx_oos_queue);
}
/*
* Detach a call from its owning socket.
*/
void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
{
struct rxrpc_connection *conn = call->conn;
bool put = false, putu = false;
_enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
call->flags, rxrpc_call_see_release);
if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
BUG();
rxrpc_put_call_slot(call);
/* Make sure we don't get any more notifications */
spin_lock(&rx->recvmsg_lock);
if (!list_empty(&call->recvmsg_link)) {
_debug("unlinking once-pending call %p { e=%lx f=%lx }",
call, call->events, call->flags);
list_del(&call->recvmsg_link);
put = true;
}
/* list_empty() must return false in rxrpc_notify_socket() */
call->recvmsg_link.next = NULL;
call->recvmsg_link.prev = NULL;
spin_unlock(&rx->recvmsg_lock);
if (put)
rxrpc_put_call(call, rxrpc_call_put_unnotify);
write_lock(&rx->call_lock);
if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
rb_erase(&call->sock_node, &rx->calls);
memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
putu = true;
}
list_del(&call->sock_link);
write_unlock(&rx->call_lock);
_debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
if (putu)
rxrpc_put_call(call, rxrpc_call_put_userid);
_leave("");
}
/*
* release all the calls associated with a socket
*/
void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
{
struct rxrpc_call *call;
_enter("%p", rx);
while (!list_empty(&rx->to_be_accepted)) {
call = list_entry(rx->to_be_accepted.next,
struct rxrpc_call, accept_link);
list_del(&call->accept_link);
rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
rxrpc_abort_call_sock_release_tba);
rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
}
while (!list_empty(&rx->sock_calls)) {
call = list_entry(rx->sock_calls.next,
struct rxrpc_call, sock_link);
rxrpc_get_call(call, rxrpc_call_get_release_sock);
rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
rxrpc_abort_call_sock_release);
rxrpc_release_call(rx, call);
rxrpc_put_call(call, rxrpc_call_put_release_sock);
}
_leave("");
}
/*
* release a call
*/
void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
{
struct rxrpc_net *rxnet = call->rxnet;
unsigned int debug_id = call->debug_id;
bool dead;
int r;
ASSERT(call != NULL);
dead = __refcount_dec_and_test(&call->ref, &r);
trace_rxrpc_call(debug_id, r - 1, 0, why);
if (dead) {
ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
if (!list_empty(&call->link)) {
spin_lock(&rxnet->call_lock);
list_del_init(&call->link);
spin_unlock(&rxnet->call_lock);
}
rxrpc_cleanup_call(call);
}
}
/*
* Free up the call under RCU.
*/
static void rxrpc_rcu_free_call(struct rcu_head *rcu)
{
struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
kmem_cache_free(rxrpc_call_jar, call);
if (atomic_dec_and_test(&rxnet->nr_calls))
wake_up_var(&rxnet->nr_calls);
}
/*
* Final call destruction - but must be done in process context.
*/
static void rxrpc_destroy_call(struct work_struct *work)
{
struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
struct rxrpc_txbuf *txb;
del_timer_sync(&call->timer);
rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
rxrpc_cleanup_ring(call);
while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
struct rxrpc_txbuf, call_link))) {
list_del(&txb->call_link);
rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
}
while ((txb = list_first_entry_or_null(&call->tx_buffer,
struct rxrpc_txbuf, call_link))) {
list_del(&txb->call_link);
rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
}
rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
rxrpc_deactivate_bundle(call->bundle);
rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
rxrpc_put_local(call->local, rxrpc_local_put_call);
call_rcu(&call->rcu, rxrpc_rcu_free_call);
}
/*
* clean up a call
*/
void rxrpc_cleanup_call(struct rxrpc_call *call)
{
memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
del_timer(&call->timer);
if (rcu_read_lock_held())
/* Can't use the rxrpc workqueue as we need to cancel/flush
* something that may be running/waiting there.
*/
schedule_work(&call->destroyer);
else
rxrpc_destroy_call(&call->destroyer);
}
/*
* Make sure that all calls are gone from a network namespace. To reach this
* point, any open UDP sockets in that namespace must have been closed, so any
* outstanding calls cannot be doing I/O.
*/
void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
{
struct rxrpc_call *call;
_enter("");
if (!list_empty(&rxnet->calls)) {
spin_lock(&rxnet->call_lock);
while (!list_empty(&rxnet->calls)) {
call = list_entry(rxnet->calls.next,
struct rxrpc_call, link);
_debug("Zapping call %p", call);
rxrpc_see_call(call, rxrpc_call_see_zap);
list_del_init(&call->link);
pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
call, refcount_read(&call->ref),
rxrpc_call_states[__rxrpc_call_state(call)],
call->flags, call->events);
spin_unlock(&rxnet->call_lock);
cond_resched();
spin_lock(&rxnet->call_lock);
}
spin_unlock(&rxnet->call_lock);
}
atomic_dec(&rxnet->nr_calls);
wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
}
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