Merge tag 'locking-urgent-2021-05-23' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / net / rxrpc / call_object.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* RxRPC individual remote procedure call handling
3  *
4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5  * Written by David Howells (dhowells@redhat.com)
6  */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/circ_buf.h>
13 #include <linux/spinlock_types.h>
14 #include <net/sock.h>
15 #include <net/af_rxrpc.h>
16 #include "ar-internal.h"
17
18 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
19         [RXRPC_CALL_UNINITIALISED]              = "Uninit  ",
20         [RXRPC_CALL_CLIENT_AWAIT_CONN]          = "ClWtConn",
21         [RXRPC_CALL_CLIENT_SEND_REQUEST]        = "ClSndReq",
22         [RXRPC_CALL_CLIENT_AWAIT_REPLY]         = "ClAwtRpl",
23         [RXRPC_CALL_CLIENT_RECV_REPLY]          = "ClRcvRpl",
24         [RXRPC_CALL_SERVER_PREALLOC]            = "SvPrealc",
25         [RXRPC_CALL_SERVER_SECURING]            = "SvSecure",
26         [RXRPC_CALL_SERVER_RECV_REQUEST]        = "SvRcvReq",
27         [RXRPC_CALL_SERVER_ACK_REQUEST]         = "SvAckReq",
28         [RXRPC_CALL_SERVER_SEND_REPLY]          = "SvSndRpl",
29         [RXRPC_CALL_SERVER_AWAIT_ACK]           = "SvAwtACK",
30         [RXRPC_CALL_COMPLETE]                   = "Complete",
31 };
32
33 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
34         [RXRPC_CALL_SUCCEEDED]                  = "Complete",
35         [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
36         [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
37         [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
38         [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
39 };
40
41 struct kmem_cache *rxrpc_call_jar;
42
43 static struct semaphore rxrpc_call_limiter =
44         __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000);
45 static struct semaphore rxrpc_kernel_call_limiter =
46         __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000);
47
48 static void rxrpc_call_timer_expired(struct timer_list *t)
49 {
50         struct rxrpc_call *call = from_timer(call, t, timer);
51
52         _enter("%d", call->debug_id);
53
54         if (call->state < RXRPC_CALL_COMPLETE) {
55                 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
56                 rxrpc_queue_call(call);
57         }
58 }
59
60 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
61
62 /*
63  * find an extant server call
64  * - called in process context with IRQs enabled
65  */
66 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
67                                               unsigned long user_call_ID)
68 {
69         struct rxrpc_call *call;
70         struct rb_node *p;
71
72         _enter("%p,%lx", rx, user_call_ID);
73
74         read_lock(&rx->call_lock);
75
76         p = rx->calls.rb_node;
77         while (p) {
78                 call = rb_entry(p, struct rxrpc_call, sock_node);
79
80                 if (user_call_ID < call->user_call_ID)
81                         p = p->rb_left;
82                 else if (user_call_ID > call->user_call_ID)
83                         p = p->rb_right;
84                 else
85                         goto found_extant_call;
86         }
87
88         read_unlock(&rx->call_lock);
89         _leave(" = NULL");
90         return NULL;
91
92 found_extant_call:
93         rxrpc_get_call(call, rxrpc_call_got);
94         read_unlock(&rx->call_lock);
95         _leave(" = %p [%d]", call, atomic_read(&call->usage));
96         return call;
97 }
98
99 /*
100  * allocate a new call
101  */
102 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
103                                     unsigned int debug_id)
104 {
105         struct rxrpc_call *call;
106         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
107
108         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
109         if (!call)
110                 return NULL;
111
112         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
113                                     sizeof(struct sk_buff *),
114                                     gfp);
115         if (!call->rxtx_buffer)
116                 goto nomem;
117
118         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
119         if (!call->rxtx_annotations)
120                 goto nomem_2;
121
122         mutex_init(&call->user_mutex);
123
124         /* Prevent lockdep reporting a deadlock false positive between the afs
125          * filesystem and sys_sendmsg() via the mmap sem.
126          */
127         if (rx->sk.sk_kern_sock)
128                 lockdep_set_class(&call->user_mutex,
129                                   &rxrpc_call_user_mutex_lock_class_key);
130
131         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
132         INIT_WORK(&call->processor, &rxrpc_process_call);
133         INIT_LIST_HEAD(&call->link);
134         INIT_LIST_HEAD(&call->chan_wait_link);
135         INIT_LIST_HEAD(&call->accept_link);
136         INIT_LIST_HEAD(&call->recvmsg_link);
137         INIT_LIST_HEAD(&call->sock_link);
138         init_waitqueue_head(&call->waitq);
139         spin_lock_init(&call->lock);
140         spin_lock_init(&call->notify_lock);
141         spin_lock_init(&call->input_lock);
142         rwlock_init(&call->state_lock);
143         atomic_set(&call->usage, 1);
144         call->debug_id = debug_id;
145         call->tx_total_len = -1;
146         call->next_rx_timo = 20 * HZ;
147         call->next_req_timo = 1 * HZ;
148
149         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
150
151         /* Leave space in the ring to handle a maxed-out jumbo packet */
152         call->rx_winsize = rxrpc_rx_window_size;
153         call->tx_winsize = 16;
154         call->rx_expect_next = 1;
155
156         call->cong_cwnd = 2;
157         call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
158
159         call->rxnet = rxnet;
160         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
161         atomic_inc(&rxnet->nr_calls);
162         return call;
163
164 nomem_2:
165         kfree(call->rxtx_buffer);
166 nomem:
167         kmem_cache_free(rxrpc_call_jar, call);
168         return NULL;
169 }
170
171 /*
172  * Allocate a new client call.
173  */
174 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
175                                                   struct sockaddr_rxrpc *srx,
176                                                   gfp_t gfp,
177                                                   unsigned int debug_id)
178 {
179         struct rxrpc_call *call;
180         ktime_t now;
181
182         _enter("");
183
184         call = rxrpc_alloc_call(rx, gfp, debug_id);
185         if (!call)
186                 return ERR_PTR(-ENOMEM);
187         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
188         call->service_id = srx->srx_service;
189         call->tx_phase = true;
190         now = ktime_get_real();
191         call->acks_latest_ts = now;
192         call->cong_tstamp = now;
193
194         _leave(" = %p", call);
195         return call;
196 }
197
198 /*
199  * Initiate the call ack/resend/expiry timer.
200  */
201 static void rxrpc_start_call_timer(struct rxrpc_call *call)
202 {
203         unsigned long now = jiffies;
204         unsigned long j = now + MAX_JIFFY_OFFSET;
205
206         call->ack_at = j;
207         call->ack_lost_at = j;
208         call->resend_at = j;
209         call->ping_at = j;
210         call->expect_rx_by = j;
211         call->expect_req_by = j;
212         call->expect_term_by = j;
213         call->timer.expires = now;
214 }
215
216 /*
217  * Wait for a call slot to become available.
218  */
219 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
220 {
221         struct semaphore *limiter = &rxrpc_call_limiter;
222
223         if (p->kernel)
224                 limiter = &rxrpc_kernel_call_limiter;
225         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
226                 down(limiter);
227                 return limiter;
228         }
229         return down_interruptible(limiter) < 0 ? NULL : limiter;
230 }
231
232 /*
233  * Release a call slot.
234  */
235 static void rxrpc_put_call_slot(struct rxrpc_call *call)
236 {
237         struct semaphore *limiter = &rxrpc_call_limiter;
238
239         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
240                 limiter = &rxrpc_kernel_call_limiter;
241         up(limiter);
242 }
243
244 /*
245  * Set up a call for the given parameters.
246  * - Called with the socket lock held, which it must release.
247  * - If it returns a call, the call's lock will need releasing by the caller.
248  */
249 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
250                                          struct rxrpc_conn_parameters *cp,
251                                          struct sockaddr_rxrpc *srx,
252                                          struct rxrpc_call_params *p,
253                                          gfp_t gfp,
254                                          unsigned int debug_id)
255         __releases(&rx->sk.sk_lock.slock)
256         __acquires(&call->user_mutex)
257 {
258         struct rxrpc_call *call, *xcall;
259         struct rxrpc_net *rxnet;
260         struct semaphore *limiter;
261         struct rb_node *parent, **pp;
262         const void *here = __builtin_return_address(0);
263         int ret;
264
265         _enter("%p,%lx", rx, p->user_call_ID);
266
267         limiter = rxrpc_get_call_slot(p, gfp);
268         if (!limiter)
269                 return ERR_PTR(-ERESTARTSYS);
270
271         call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
272         if (IS_ERR(call)) {
273                 release_sock(&rx->sk);
274                 up(limiter);
275                 _leave(" = %ld", PTR_ERR(call));
276                 return call;
277         }
278
279         call->interruptibility = p->interruptibility;
280         call->tx_total_len = p->tx_total_len;
281         trace_rxrpc_call(call->debug_id, rxrpc_call_new_client,
282                          atomic_read(&call->usage),
283                          here, (const void *)p->user_call_ID);
284         if (p->kernel)
285                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
286
287         /* We need to protect a partially set up call against the user as we
288          * will be acting outside the socket lock.
289          */
290         mutex_lock(&call->user_mutex);
291
292         /* Publish the call, even though it is incompletely set up as yet */
293         write_lock(&rx->call_lock);
294
295         pp = &rx->calls.rb_node;
296         parent = NULL;
297         while (*pp) {
298                 parent = *pp;
299                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
300
301                 if (p->user_call_ID < xcall->user_call_ID)
302                         pp = &(*pp)->rb_left;
303                 else if (p->user_call_ID > xcall->user_call_ID)
304                         pp = &(*pp)->rb_right;
305                 else
306                         goto error_dup_user_ID;
307         }
308
309         rcu_assign_pointer(call->socket, rx);
310         call->user_call_ID = p->user_call_ID;
311         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
312         rxrpc_get_call(call, rxrpc_call_got_userid);
313         rb_link_node(&call->sock_node, parent, pp);
314         rb_insert_color(&call->sock_node, &rx->calls);
315         list_add(&call->sock_link, &rx->sock_calls);
316
317         write_unlock(&rx->call_lock);
318
319         rxnet = call->rxnet;
320         write_lock(&rxnet->call_lock);
321         list_add_tail(&call->link, &rxnet->calls);
322         write_unlock(&rxnet->call_lock);
323
324         /* From this point on, the call is protected by its own lock. */
325         release_sock(&rx->sk);
326
327         /* Set up or get a connection record and set the protocol parameters,
328          * including channel number and call ID.
329          */
330         ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
331         if (ret < 0)
332                 goto error_attached_to_socket;
333
334         trace_rxrpc_call(call->debug_id, rxrpc_call_connected,
335                          atomic_read(&call->usage), here, NULL);
336
337         rxrpc_start_call_timer(call);
338
339         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
340
341         _leave(" = %p [new]", call);
342         return call;
343
344         /* We unexpectedly found the user ID in the list after taking
345          * the call_lock.  This shouldn't happen unless the user races
346          * with itself and tries to add the same user ID twice at the
347          * same time in different threads.
348          */
349 error_dup_user_ID:
350         write_unlock(&rx->call_lock);
351         release_sock(&rx->sk);
352         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
353                                     RX_CALL_DEAD, -EEXIST);
354         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
355                          atomic_read(&call->usage), here, ERR_PTR(-EEXIST));
356         rxrpc_release_call(rx, call);
357         mutex_unlock(&call->user_mutex);
358         rxrpc_put_call(call, rxrpc_call_put);
359         _leave(" = -EEXIST");
360         return ERR_PTR(-EEXIST);
361
362         /* We got an error, but the call is attached to the socket and is in
363          * need of release.  However, we might now race with recvmsg() when
364          * completing the call queues it.  Return 0 from sys_sendmsg() and
365          * leave the error to recvmsg() to deal with.
366          */
367 error_attached_to_socket:
368         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
369                          atomic_read(&call->usage), here, ERR_PTR(ret));
370         set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
371         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
372                                     RX_CALL_DEAD, ret);
373         _leave(" = c=%08x [err]", call->debug_id);
374         return call;
375 }
376
377 /*
378  * Set up an incoming call.  call->conn points to the connection.
379  * This is called in BH context and isn't allowed to fail.
380  */
381 void rxrpc_incoming_call(struct rxrpc_sock *rx,
382                          struct rxrpc_call *call,
383                          struct sk_buff *skb)
384 {
385         struct rxrpc_connection *conn = call->conn;
386         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
387         u32 chan;
388
389         _enter(",%d", call->conn->debug_id);
390
391         rcu_assign_pointer(call->socket, rx);
392         call->call_id           = sp->hdr.callNumber;
393         call->service_id        = sp->hdr.serviceId;
394         call->cid               = sp->hdr.cid;
395         call->state             = RXRPC_CALL_SERVER_SECURING;
396         call->cong_tstamp       = skb->tstamp;
397
398         /* Set the channel for this call.  We don't get channel_lock as we're
399          * only defending against the data_ready handler (which we're called
400          * from) and the RESPONSE packet parser (which is only really
401          * interested in call_counter and can cope with a disagreement with the
402          * call pointer).
403          */
404         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
405         conn->channels[chan].call_counter = call->call_id;
406         conn->channels[chan].call_id = call->call_id;
407         rcu_assign_pointer(conn->channels[chan].call, call);
408
409         spin_lock(&conn->params.peer->lock);
410         hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
411         spin_unlock(&conn->params.peer->lock);
412
413         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
414
415         rxrpc_start_call_timer(call);
416         _leave("");
417 }
418
419 /*
420  * Queue a call's work processor, getting a ref to pass to the work queue.
421  */
422 bool rxrpc_queue_call(struct rxrpc_call *call)
423 {
424         const void *here = __builtin_return_address(0);
425         int n = atomic_fetch_add_unless(&call->usage, 1, 0);
426         if (n == 0)
427                 return false;
428         if (rxrpc_queue_work(&call->processor))
429                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1,
430                                  here, NULL);
431         else
432                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
433         return true;
434 }
435
436 /*
437  * Queue a call's work processor, passing the callers ref to the work queue.
438  */
439 bool __rxrpc_queue_call(struct rxrpc_call *call)
440 {
441         const void *here = __builtin_return_address(0);
442         int n = atomic_read(&call->usage);
443         ASSERTCMP(n, >=, 1);
444         if (rxrpc_queue_work(&call->processor))
445                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n,
446                                  here, NULL);
447         else
448                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
449         return true;
450 }
451
452 /*
453  * Note the re-emergence of a call.
454  */
455 void rxrpc_see_call(struct rxrpc_call *call)
456 {
457         const void *here = __builtin_return_address(0);
458         if (call) {
459                 int n = atomic_read(&call->usage);
460
461                 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n,
462                                  here, NULL);
463         }
464 }
465
466 /*
467  * Note the addition of a ref on a call.
468  */
469 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
470 {
471         const void *here = __builtin_return_address(0);
472         int n = atomic_inc_return(&call->usage);
473
474         trace_rxrpc_call(call->debug_id, op, n, here, NULL);
475 }
476
477 /*
478  * Clean up the RxTx skb ring.
479  */
480 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
481 {
482         int i;
483
484         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
485                 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned);
486                 call->rxtx_buffer[i] = NULL;
487         }
488 }
489
490 /*
491  * Detach a call from its owning socket.
492  */
493 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
494 {
495         const void *here = __builtin_return_address(0);
496         struct rxrpc_connection *conn = call->conn;
497         bool put = false;
498
499         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
500
501         trace_rxrpc_call(call->debug_id, rxrpc_call_release,
502                          atomic_read(&call->usage),
503                          here, (const void *)call->flags);
504
505         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
506
507         spin_lock_bh(&call->lock);
508         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
509                 BUG();
510         spin_unlock_bh(&call->lock);
511
512         rxrpc_put_call_slot(call);
513
514         del_timer_sync(&call->timer);
515
516         /* Make sure we don't get any more notifications */
517         write_lock_bh(&rx->recvmsg_lock);
518
519         if (!list_empty(&call->recvmsg_link)) {
520                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
521                        call, call->events, call->flags);
522                 list_del(&call->recvmsg_link);
523                 put = true;
524         }
525
526         /* list_empty() must return false in rxrpc_notify_socket() */
527         call->recvmsg_link.next = NULL;
528         call->recvmsg_link.prev = NULL;
529
530         write_unlock_bh(&rx->recvmsg_lock);
531         if (put)
532                 rxrpc_put_call(call, rxrpc_call_put);
533
534         write_lock(&rx->call_lock);
535
536         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
537                 rb_erase(&call->sock_node, &rx->calls);
538                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
539                 rxrpc_put_call(call, rxrpc_call_put_userid);
540         }
541
542         list_del(&call->sock_link);
543         write_unlock(&rx->call_lock);
544
545         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
546
547         if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
548                 rxrpc_disconnect_call(call);
549         if (call->security)
550                 call->security->free_call_crypto(call);
551         _leave("");
552 }
553
554 /*
555  * release all the calls associated with a socket
556  */
557 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
558 {
559         struct rxrpc_call *call;
560
561         _enter("%p", rx);
562
563         while (!list_empty(&rx->to_be_accepted)) {
564                 call = list_entry(rx->to_be_accepted.next,
565                                   struct rxrpc_call, accept_link);
566                 list_del(&call->accept_link);
567                 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
568                 rxrpc_put_call(call, rxrpc_call_put);
569         }
570
571         while (!list_empty(&rx->sock_calls)) {
572                 call = list_entry(rx->sock_calls.next,
573                                   struct rxrpc_call, sock_link);
574                 rxrpc_get_call(call, rxrpc_call_got);
575                 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
576                 rxrpc_send_abort_packet(call);
577                 rxrpc_release_call(rx, call);
578                 rxrpc_put_call(call, rxrpc_call_put);
579         }
580
581         _leave("");
582 }
583
584 /*
585  * release a call
586  */
587 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
588 {
589         struct rxrpc_net *rxnet = call->rxnet;
590         const void *here = __builtin_return_address(0);
591         unsigned int debug_id = call->debug_id;
592         int n;
593
594         ASSERT(call != NULL);
595
596         n = atomic_dec_return(&call->usage);
597         trace_rxrpc_call(debug_id, op, n, here, NULL);
598         ASSERTCMP(n, >=, 0);
599         if (n == 0) {
600                 _debug("call %d dead", call->debug_id);
601                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
602
603                 if (!list_empty(&call->link)) {
604                         write_lock(&rxnet->call_lock);
605                         list_del_init(&call->link);
606                         write_unlock(&rxnet->call_lock);
607                 }
608
609                 rxrpc_cleanup_call(call);
610         }
611 }
612
613 /*
614  * Final call destruction - but must be done in process context.
615  */
616 static void rxrpc_destroy_call(struct work_struct *work)
617 {
618         struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor);
619         struct rxrpc_net *rxnet = call->rxnet;
620
621         rxrpc_put_connection(call->conn);
622         rxrpc_put_peer(call->peer);
623         kfree(call->rxtx_buffer);
624         kfree(call->rxtx_annotations);
625         kmem_cache_free(rxrpc_call_jar, call);
626         if (atomic_dec_and_test(&rxnet->nr_calls))
627                 wake_up_var(&rxnet->nr_calls);
628 }
629
630 /*
631  * Final call destruction under RCU.
632  */
633 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
634 {
635         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
636
637         if (in_softirq()) {
638                 INIT_WORK(&call->processor, rxrpc_destroy_call);
639                 if (!rxrpc_queue_work(&call->processor))
640                         BUG();
641         } else {
642                 rxrpc_destroy_call(&call->processor);
643         }
644 }
645
646 /*
647  * clean up a call
648  */
649 void rxrpc_cleanup_call(struct rxrpc_call *call)
650 {
651         _net("DESTROY CALL %d", call->debug_id);
652
653         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
654
655         del_timer_sync(&call->timer);
656
657         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
658         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
659
660         rxrpc_cleanup_ring(call);
661         rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned);
662
663         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
664 }
665
666 /*
667  * Make sure that all calls are gone from a network namespace.  To reach this
668  * point, any open UDP sockets in that namespace must have been closed, so any
669  * outstanding calls cannot be doing I/O.
670  */
671 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
672 {
673         struct rxrpc_call *call;
674
675         _enter("");
676
677         if (!list_empty(&rxnet->calls)) {
678                 write_lock(&rxnet->call_lock);
679
680                 while (!list_empty(&rxnet->calls)) {
681                         call = list_entry(rxnet->calls.next,
682                                           struct rxrpc_call, link);
683                         _debug("Zapping call %p", call);
684
685                         rxrpc_see_call(call);
686                         list_del_init(&call->link);
687
688                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
689                                call, atomic_read(&call->usage),
690                                rxrpc_call_states[call->state],
691                                call->flags, call->events);
692
693                         write_unlock(&rxnet->call_lock);
694                         cond_resched();
695                         write_lock(&rxnet->call_lock);
696                 }
697
698                 write_unlock(&rxnet->call_lock);
699         }
700
701         atomic_dec(&rxnet->nr_calls);
702         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
703 }