net/rxrpc/call_object.c

   1 /* RxRPC individual remote procedure call handling
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16 #include <linux/circ_buf.h>
  17 #include <linux/spinlock_types.h>
  18 #include <net/sock.h>
  19 #include <net/af_rxrpc.h>
  20 #include "ar-internal.h"
  21
  22 /*
  23  * Maximum lifetime of a call (in jiffies).
  24  */
  25 unsigned int rxrpc_max_call_lifetime = 60 * HZ;
  26
  27 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
  28         [RXRPC_CALL_UNINITIALISED]              = "Uninit  ",
  29         [RXRPC_CALL_CLIENT_AWAIT_CONN]          = "ClWtConn",
  30         [RXRPC_CALL_CLIENT_SEND_REQUEST]        = "ClSndReq",
  31         [RXRPC_CALL_CLIENT_AWAIT_REPLY]         = "ClAwtRpl",
  32         [RXRPC_CALL_CLIENT_RECV_REPLY]          = "ClRcvRpl",
  33         [RXRPC_CALL_SERVER_PREALLOC]            = "SvPrealc",
  34         [RXRPC_CALL_SERVER_SECURING]            = "SvSecure",
  35         [RXRPC_CALL_SERVER_ACCEPTING]           = "SvAccept",
  36         [RXRPC_CALL_SERVER_RECV_REQUEST]        = "SvRcvReq",
  37         [RXRPC_CALL_SERVER_ACK_REQUEST]         = "SvAckReq",
  38         [RXRPC_CALL_SERVER_SEND_REPLY]          = "SvSndRpl",
  39         [RXRPC_CALL_SERVER_AWAIT_ACK]           = "SvAwtACK",
  40         [RXRPC_CALL_COMPLETE]                   = "Complete",
  41 };
  42
  43 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
  44         [RXRPC_CALL_SUCCEEDED]                  = "Complete",
  45         [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
  46         [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
  47         [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
  48         [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
  49 };
  50
  51 const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = {
  52         [rxrpc_call_new_client]         = "NWc",
  53         [rxrpc_call_new_service]        = "NWs",
  54         [rxrpc_call_queued]             = "QUE",
  55         [rxrpc_call_queued_ref]         = "QUR",
  56         [rxrpc_call_connected]          = "CON",
  57         [rxrpc_call_release]            = "RLS",
  58         [rxrpc_call_seen]               = "SEE",
  59         [rxrpc_call_got]                = "GOT",
  60         [rxrpc_call_got_userid]         = "Gus",
  61         [rxrpc_call_got_kernel]         = "Gke",
  62         [rxrpc_call_put]                = "PUT",
  63         [rxrpc_call_put_userid]         = "Pus",
  64         [rxrpc_call_put_kernel]         = "Pke",
  65         [rxrpc_call_put_noqueue]        = "PNQ",
  66         [rxrpc_call_error]              = "*E*",
  67 };
  68
  69 struct kmem_cache *rxrpc_call_jar;
  70 LIST_HEAD(rxrpc_calls);
  71 DEFINE_RWLOCK(rxrpc_call_lock);
  72
  73 static void rxrpc_call_timer_expired(unsigned long _call)
  74 {
  75         struct rxrpc_call *call = (struct rxrpc_call *)_call;
  76
  77         _enter("%d", call->debug_id);
  78
  79         if (call->state < RXRPC_CALL_COMPLETE) {
  80                 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
  81                 rxrpc_queue_call(call);
  82         }
  83 }
  84
  85 /*
  86  * find an extant server call
  87  * - called in process context with IRQs enabled
  88  */
  89 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  90                                               unsigned long user_call_ID)
  91 {
  92         struct rxrpc_call *call;
  93         struct rb_node *p;
  94
  95         _enter("%p,%lx", rx, user_call_ID);
  96
  97         read_lock(&rx->call_lock);
  98
  99         p = rx->calls.rb_node;
 100         while (p) {
 101                 call = rb_entry(p, struct rxrpc_call, sock_node);
 102
 103                 if (user_call_ID < call->user_call_ID)
 104                         p = p->rb_left;
 105                 else if (user_call_ID > call->user_call_ID)
 106                         p = p->rb_right;
 107                 else
 108                         goto found_extant_call;
 109         }
 110
 111         read_unlock(&rx->call_lock);
 112         _leave(" = NULL");
 113         return NULL;
 114
 115 found_extant_call:
 116         rxrpc_get_call(call, rxrpc_call_got);
 117         read_unlock(&rx->call_lock);
 118         _leave(" = %p [%d]", call, atomic_read(&call->usage));
 119         return call;
 120 }
 121
 122 /*
 123  * allocate a new call
 124  */
 125 struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
 126 {
 127         struct rxrpc_call *call;
 128
 129         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 130         if (!call)
 131                 return NULL;
 132
 133         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
 134                                     sizeof(struct sk_buff *),
 135                                     gfp);
 136         if (!call->rxtx_buffer)
 137                 goto nomem;
 138
 139         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
 140         if (!call->rxtx_annotations)
 141                 goto nomem_2;
 142
 143         setup_timer(&call->timer, rxrpc_call_timer_expired,
 144                     (unsigned long)call);
 145         INIT_WORK(&call->processor, &rxrpc_process_call);
 146         INIT_LIST_HEAD(&call->link);
 147         INIT_LIST_HEAD(&call->chan_wait_link);
 148         INIT_LIST_HEAD(&call->accept_link);
 149         INIT_LIST_HEAD(&call->recvmsg_link);
 150         INIT_LIST_HEAD(&call->sock_link);
 151         init_waitqueue_head(&call->waitq);
 152         spin_lock_init(&call->lock);
 153         rwlock_init(&call->state_lock);
 154         atomic_set(&call->usage, 1);
 155         call->debug_id = atomic_inc_return(&rxrpc_debug_id);
 156
 157         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 158
 159         /* Leave space in the ring to handle a maxed-out jumbo packet */
 160         call->rx_winsize = rxrpc_rx_window_size;
 161         call->tx_winsize = 16;
 162         call->rx_expect_next = 1;
 163
 164         if (RXRPC_TX_SMSS > 2190)
 165                 call->cong_cwnd = 2;
 166         else if (RXRPC_TX_SMSS > 1095)
 167                 call->cong_cwnd = 3;
 168         else
 169                 call->cong_cwnd = 4;
 170         call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
 171         return call;
 172
 173 nomem_2:
 174         kfree(call->rxtx_buffer);
 175 nomem:
 176         kmem_cache_free(rxrpc_call_jar, call);
 177         return NULL;
 178 }
 179
 180 /*
 181  * Allocate a new client call.
 182  */
 183 static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
 184                                                   gfp_t gfp)
 185 {
 186         struct rxrpc_call *call;
 187         ktime_t now;
 188
 189         _enter("");
 190
 191         call = rxrpc_alloc_call(gfp);
 192         if (!call)
 193                 return ERR_PTR(-ENOMEM);
 194         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
 195         call->service_id = srx->srx_service;
 196         call->tx_phase = true;
 197         now = ktime_get_real();
 198         call->acks_latest_ts = now;
 199         call->cong_tstamp = now;
 200
 201         _leave(" = %p", call);
 202         return call;
 203 }
 204
 205 /*
 206  * Initiate the call ack/resend/expiry timer.
 207  */
 208 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 209 {
 210         unsigned long expire_at;
 211
 212         expire_at = jiffies + rxrpc_max_call_lifetime;
 213         call->expire_at = expire_at;
 214         call->ack_at = expire_at;
 215         call->resend_at = expire_at;
 216         call->timer.expires = expire_at + 1;
 217         rxrpc_set_timer(call, rxrpc_timer_begin);
 218 }
 219
 220 /*
 221  * set up a call for the given data
 222  * - called in process context with IRQs enabled
 223  */
 224 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 225                                          struct rxrpc_conn_parameters *cp,
 226                                          struct sockaddr_rxrpc *srx,
 227                                          unsigned long user_call_ID,
 228                                          gfp_t gfp)
 229 {
 230         struct rxrpc_call *call, *xcall;
 231         struct rb_node *parent, **pp;
 232         const void *here = __builtin_return_address(0);
 233         int ret;
 234
 235         _enter("%p,%lx", rx, user_call_ID);
 236
 237         call = rxrpc_alloc_client_call(srx, gfp);
 238         if (IS_ERR(call)) {
 239                 _leave(" = %ld", PTR_ERR(call));
 240                 return call;
 241         }
 242
 243         trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
 244                          here, (const void *)user_call_ID);
 245
 246         /* Publish the call, even though it is incompletely set up as yet */
 247         write_lock(&rx->call_lock);
 248
 249         pp = &rx->calls.rb_node;
 250         parent = NULL;
 251         while (*pp) {
 252                 parent = *pp;
 253                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 254
 255                 if (user_call_ID < xcall->user_call_ID)
 256                         pp = &(*pp)->rb_left;
 257                 else if (user_call_ID > xcall->user_call_ID)
 258                         pp = &(*pp)->rb_right;
 259                 else
 260                         goto error_dup_user_ID;
 261         }
 262
 263         rcu_assign_pointer(call->socket, rx);
 264         call->user_call_ID = user_call_ID;
 265         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 266         rxrpc_get_call(call, rxrpc_call_got_userid);
 267         rb_link_node(&call->sock_node, parent, pp);
 268         rb_insert_color(&call->sock_node, &rx->calls);
 269         list_add(&call->sock_link, &rx->sock_calls);
 270
 271         write_unlock(&rx->call_lock);
 272
 273         write_lock(&rxrpc_call_lock);
 274         list_add_tail(&call->link, &rxrpc_calls);
 275         write_unlock(&rxrpc_call_lock);
 276
 277         /* Set up or get a connection record and set the protocol parameters,
 278          * including channel number and call ID.
 279          */
 280         ret = rxrpc_connect_call(call, cp, srx, gfp);
 281         if (ret < 0)
 282                 goto error;
 283
 284         trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
 285                          here, ERR_PTR(ret));
 286
 287         spin_lock_bh(&call->conn->params.peer->lock);
 288         hlist_add_head(&call->error_link,
 289                        &call->conn->params.peer->error_targets);
 290         spin_unlock_bh(&call->conn->params.peer->lock);
 291
 292         rxrpc_start_call_timer(call);
 293
 294         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 295
 296         _leave(" = %p [new]", call);
 297         return call;
 298
 299         /* We unexpectedly found the user ID in the list after taking
 300          * the call_lock.  This shouldn't happen unless the user races
 301          * with itself and tries to add the same user ID twice at the
 302          * same time in different threads.
 303          */
 304 error_dup_user_ID:
 305         write_unlock(&rx->call_lock);
 306         ret = -EEXIST;
 307
 308 error:
 309         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 310                                     RX_CALL_DEAD, ret);
 311         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 312                          here, ERR_PTR(ret));
 313         rxrpc_release_call(rx, call);
 314         rxrpc_put_call(call, rxrpc_call_put);
 315         _leave(" = %d", ret);
 316         return ERR_PTR(ret);
 317 }
 318
 319 /*
 320  * Set up an incoming call.  call->conn points to the connection.
 321  * This is called in BH context and isn't allowed to fail.
 322  */
 323 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 324                          struct rxrpc_call *call,
 325                          struct sk_buff *skb)
 326 {
 327         struct rxrpc_connection *conn = call->conn;
 328         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 329         u32 chan;
 330
 331         _enter(",%d", call->conn->debug_id);
 332
 333         rcu_assign_pointer(call->socket, rx);
 334         call->call_id           = sp->hdr.callNumber;
 335         call->service_id        = sp->hdr.serviceId;
 336         call->cid               = sp->hdr.cid;
 337         call->state             = RXRPC_CALL_SERVER_ACCEPTING;
 338         if (sp->hdr.securityIndex > 0)
 339                 call->state     = RXRPC_CALL_SERVER_SECURING;
 340         call->cong_tstamp       = skb->tstamp;
 341
 342         /* Set the channel for this call.  We don't get channel_lock as we're
 343          * only defending against the data_ready handler (which we're called
 344          * from) and the RESPONSE packet parser (which is only really
 345          * interested in call_counter and can cope with a disagreement with the
 346          * call pointer).
 347          */
 348         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 349         conn->channels[chan].call_counter = call->call_id;
 350         conn->channels[chan].call_id = call->call_id;
 351         rcu_assign_pointer(conn->channels[chan].call, call);
 352
 353         spin_lock(&conn->params.peer->lock);
 354         hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
 355         spin_unlock(&conn->params.peer->lock);
 356
 357         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
 358
 359         rxrpc_start_call_timer(call);
 360         _leave("");
 361 }
 362
 363 /*
 364  * Queue a call's work processor, getting a ref to pass to the work queue.
 365  */
 366 bool rxrpc_queue_call(struct rxrpc_call *call)
 367 {
 368         const void *here = __builtin_return_address(0);
 369         int n = __atomic_add_unless(&call->usage, 1, 0);
 370         if (n == 0)
 371                 return false;
 372         if (rxrpc_queue_work(&call->processor))
 373                 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
 374         else
 375                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 376         return true;
 377 }
 378
 379 /*
 380  * Queue a call's work processor, passing the callers ref to the work queue.
 381  */
 382 bool __rxrpc_queue_call(struct rxrpc_call *call)
 383 {
 384         const void *here = __builtin_return_address(0);
 385         int n = atomic_read(&call->usage);
 386         ASSERTCMP(n, >=, 1);
 387         if (rxrpc_queue_work(&call->processor))
 388                 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
 389         else
 390                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 391         return true;
 392 }
 393
 394 /*
 395  * Note the re-emergence of a call.
 396  */
 397 void rxrpc_see_call(struct rxrpc_call *call)
 398 {
 399         const void *here = __builtin_return_address(0);
 400         if (call) {
 401                 int n = atomic_read(&call->usage);
 402
 403                 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
 404         }
 405 }
 406
 407 /*
 408  * Note the addition of a ref on a call.
 409  */
 410 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 411 {
 412         const void *here = __builtin_return_address(0);
 413         int n = atomic_inc_return(&call->usage);
 414
 415         trace_rxrpc_call(call, op, n, here, NULL);
 416 }
 417
 418 /*
 419  * Detach a call from its owning socket.
 420  */
 421 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 422 {
 423         const void *here = __builtin_return_address(0);
 424         struct rxrpc_connection *conn = call->conn;
 425         bool put = false;
 426         int i;
 427
 428         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 429
 430         trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
 431                          here, (const void *)call->flags);
 432
 433         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 434
 435         spin_lock_bh(&call->lock);
 436         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 437                 BUG();
 438         spin_unlock_bh(&call->lock);
 439
 440         del_timer_sync(&call->timer);
 441
 442         /* Make sure we don't get any more notifications */
 443         write_lock_bh(&rx->recvmsg_lock);
 444
 445         if (!list_empty(&call->recvmsg_link)) {
 446                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 447                        call, call->events, call->flags);
 448                 list_del(&call->recvmsg_link);
 449                 put = true;
 450         }
 451
 452         /* list_empty() must return false in rxrpc_notify_socket() */
 453         call->recvmsg_link.next = NULL;
 454         call->recvmsg_link.prev = NULL;
 455
 456         write_unlock_bh(&rx->recvmsg_lock);
 457         if (put)
 458                 rxrpc_put_call(call, rxrpc_call_put);
 459
 460         write_lock(&rx->call_lock);
 461
 462         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 463                 rb_erase(&call->sock_node, &rx->calls);
 464                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 465                 rxrpc_put_call(call, rxrpc_call_put_userid);
 466         }
 467
 468         list_del(&call->sock_link);
 469         write_unlock(&rx->call_lock);
 470
 471         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 472
 473         if (conn)
 474                 rxrpc_disconnect_call(call);
 475
 476         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 477                 rxrpc_free_skb(call->rxtx_buffer[i],
 478                                (call->tx_phase ? rxrpc_skb_tx_cleaned :
 479                                 rxrpc_skb_rx_cleaned));
 480                 call->rxtx_buffer[i] = NULL;
 481         }
 482
 483         _leave("");
 484 }
 485
 486 /*
 487  * release all the calls associated with a socket
 488  */
 489 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 490 {
 491         struct rxrpc_call *call;
 492
 493         _enter("%p", rx);
 494
 495         while (!list_empty(&rx->to_be_accepted)) {
 496                 call = list_entry(rx->to_be_accepted.next,
 497                                   struct rxrpc_call, accept_link);
 498                 list_del(&call->accept_link);
 499                 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET);
 500                 rxrpc_put_call(call, rxrpc_call_put);
 501         }
 502
 503         while (!list_empty(&rx->sock_calls)) {
 504                 call = list_entry(rx->sock_calls.next,
 505                                   struct rxrpc_call, sock_link);
 506                 rxrpc_get_call(call, rxrpc_call_got);
 507                 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET);
 508                 rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
 509                 rxrpc_release_call(rx, call);
 510                 rxrpc_put_call(call, rxrpc_call_put);
 511         }
 512
 513         _leave("");
 514 }
 515
 516 /*
 517  * release a call
 518  */
 519 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 520 {
 521         const void *here = __builtin_return_address(0);
 522         int n;
 523
 524         ASSERT(call != NULL);
 525
 526         n = atomic_dec_return(&call->usage);
 527         trace_rxrpc_call(call, op, n, here, NULL);
 528         ASSERTCMP(n, >=, 0);
 529         if (n == 0) {
 530                 _debug("call %d dead", call->debug_id);
 531                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 532
 533                 write_lock(&rxrpc_call_lock);
 534                 list_del_init(&call->link);
 535                 write_unlock(&rxrpc_call_lock);
 536
 537                 rxrpc_cleanup_call(call);
 538         }
 539 }
 540
 541 /*
 542  * Final call destruction under RCU.
 543  */
 544 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
 545 {
 546         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 547
 548         rxrpc_put_peer(call->peer);
 549         kfree(call->rxtx_buffer);
 550         kfree(call->rxtx_annotations);
 551         kmem_cache_free(rxrpc_call_jar, call);
 552 }
 553
 554 /*
 555  * clean up a call
 556  */
 557 void rxrpc_cleanup_call(struct rxrpc_call *call)
 558 {
 559         int i;
 560
 561         _net("DESTROY CALL %d", call->debug_id);
 562
 563         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 564
 565         del_timer_sync(&call->timer);
 566
 567         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 568         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 569         ASSERTCMP(call->conn, ==, NULL);
 570
 571         /* Clean up the Rx/Tx buffer */
 572         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
 573                 rxrpc_free_skb(call->rxtx_buffer[i],
 574                                (call->tx_phase ? rxrpc_skb_tx_cleaned :
 575                                 rxrpc_skb_rx_cleaned));
 576
 577         rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
 578
 579         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
 580 }
 581
 582 /*
 583  * Make sure that all calls are gone.
 584  */
 585 void __exit rxrpc_destroy_all_calls(void)
 586 {
 587         struct rxrpc_call *call;
 588
 589         _enter("");
 590
 591         if (list_empty(&rxrpc_calls))
 592                 return;
 593
 594         write_lock(&rxrpc_call_lock);
 595
 596         while (!list_empty(&rxrpc_calls)) {
 597                 call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
 598                 _debug("Zapping call %p", call);
 599
 600                 rxrpc_see_call(call);
 601                 list_del_init(&call->link);
 602
 603                 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 604                        call, atomic_read(&call->usage),
 605                        rxrpc_call_states[call->state],
 606                        call->flags, call->events);
 607
 608                 write_unlock(&rxrpc_call_lock);
 609                 cond_resched();
 610                 write_lock(&rxrpc_call_lock);
 611         }
 612
 613         write_unlock(&rxrpc_call_lock);
 614 }