linux/drivers/hv/channel_mgmt.c
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   1/*
   2 * Copyright (c) 2009, Microsoft Corporation.
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms and conditions of the GNU General Public License,
   6 * version 2, as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope it will be useful, but WITHOUT
   9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11 * more details.
  12 *
  13 * You should have received a copy of the GNU General Public License along with
  14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15 * Place - Suite 330, Boston, MA 02111-1307 USA.
  16 *
  17 * Authors:
  18 *   Haiyang Zhang <haiyangz@microsoft.com>
  19 *   Hank Janssen  <hjanssen@microsoft.com>
  20 */
  21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23#include <linux/kernel.h>
  24#include <linux/sched.h>
  25#include <linux/wait.h>
  26#include <linux/mm.h>
  27#include <linux/slab.h>
  28#include <linux/list.h>
  29#include <linux/module.h>
  30#include <linux/completion.h>
  31#include <linux/hyperv.h>
  32
  33#include "hyperv_vmbus.h"
  34
  35struct vmbus_channel_message_table_entry {
  36        enum vmbus_channel_message_type message_type;
  37        void (*message_handler)(struct vmbus_channel_message_header *msg);
  38};
  39
  40
  41/**
  42 * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
  43 * @icmsghdrp: Pointer to msg header structure
  44 * @icmsg_negotiate: Pointer to negotiate message structure
  45 * @buf: Raw buffer channel data
  46 *
  47 * @icmsghdrp is of type &struct icmsg_hdr.
  48 * @negop is of type &struct icmsg_negotiate.
  49 * Set up and fill in default negotiate response message.
  50 *
  51 * The max_fw_version specifies the maximum framework version that
  52 * we can support and max _srv_version specifies the maximum service
  53 * version we can support. A special value MAX_SRV_VER can be
  54 * specified to indicate that we can handle the maximum version
  55 * exposed by the host.
  56 *
  57 * Mainly used by Hyper-V drivers.
  58 */
  59void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
  60                                struct icmsg_negotiate *negop, u8 *buf,
  61                                int max_fw_version, int max_srv_version)
  62{
  63        int icframe_vercnt;
  64        int icmsg_vercnt;
  65        int i;
  66
  67        icmsghdrp->icmsgsize = 0x10;
  68
  69        negop = (struct icmsg_negotiate *)&buf[
  70                sizeof(struct vmbuspipe_hdr) +
  71                sizeof(struct icmsg_hdr)];
  72
  73        icframe_vercnt = negop->icframe_vercnt;
  74        icmsg_vercnt = negop->icmsg_vercnt;
  75
  76        /*
  77         * Select the framework version number we will
  78         * support.
  79         */
  80
  81        for (i = 0; i < negop->icframe_vercnt; i++) {
  82                if (negop->icversion_data[i].major <= max_fw_version)
  83                        icframe_vercnt = negop->icversion_data[i].major;
  84        }
  85
  86        for (i = negop->icframe_vercnt;
  87                 (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) {
  88                if (negop->icversion_data[i].major <= max_srv_version)
  89                        icmsg_vercnt = negop->icversion_data[i].major;
  90        }
  91
  92        /*
  93         * Respond with the maximum framework and service
  94         * version numbers we can support.
  95         */
  96        negop->icframe_vercnt = 1;
  97        negop->icmsg_vercnt = 1;
  98        negop->icversion_data[0].major = icframe_vercnt;
  99        negop->icversion_data[0].minor = 0;
 100        negop->icversion_data[1].major = icmsg_vercnt;
 101        negop->icversion_data[1].minor = 0;
 102}
 103
 104EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
 105
 106/*
 107 * alloc_channel - Allocate and initialize a vmbus channel object
 108 */
 109static struct vmbus_channel *alloc_channel(void)
 110{
 111        struct vmbus_channel *channel;
 112
 113        channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 114        if (!channel)
 115                return NULL;
 116
 117        spin_lock_init(&channel->inbound_lock);
 118
 119        channel->controlwq = create_workqueue("hv_vmbus_ctl");
 120        if (!channel->controlwq) {
 121                kfree(channel);
 122                return NULL;
 123        }
 124
 125        return channel;
 126}
 127
 128/*
 129 * release_hannel - Release the vmbus channel object itself
 130 */
 131static void release_channel(struct work_struct *work)
 132{
 133        struct vmbus_channel *channel = container_of(work,
 134                                                     struct vmbus_channel,
 135                                                     work);
 136
 137        destroy_workqueue(channel->controlwq);
 138
 139        kfree(channel);
 140}
 141
 142/*
 143 * free_channel - Release the resources used by the vmbus channel object
 144 */
 145static void free_channel(struct vmbus_channel *channel)
 146{
 147
 148        /*
 149         * We have to release the channel's workqueue/thread in the vmbus's
 150         * workqueue/thread context
 151         * ie we can't destroy ourselves.
 152         */
 153        INIT_WORK(&channel->work, release_channel);
 154        queue_work(vmbus_connection.work_queue, &channel->work);
 155}
 156
 157
 158
 159/*
 160 * vmbus_process_rescind_offer -
 161 * Rescind the offer by initiating a device removal
 162 */
 163static void vmbus_process_rescind_offer(struct work_struct *work)
 164{
 165        struct vmbus_channel *channel = container_of(work,
 166                                                     struct vmbus_channel,
 167                                                     work);
 168
 169        vmbus_device_unregister(channel->device_obj);
 170}
 171
 172void vmbus_free_channels(void)
 173{
 174        struct vmbus_channel *channel;
 175
 176        list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
 177                vmbus_device_unregister(channel->device_obj);
 178                kfree(channel->device_obj);
 179                free_channel(channel);
 180        }
 181}
 182
 183/*
 184 * vmbus_process_offer - Process the offer by creating a channel/device
 185 * associated with this offer
 186 */
 187static void vmbus_process_offer(struct work_struct *work)
 188{
 189        struct vmbus_channel *newchannel = container_of(work,
 190                                                        struct vmbus_channel,
 191                                                        work);
 192        struct vmbus_channel *channel;
 193        bool fnew = true;
 194        int ret;
 195        unsigned long flags;
 196
 197        /* The next possible work is rescind handling */
 198        INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
 199
 200        /* Make sure this is a new offer */
 201        spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 202
 203        list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
 204                if (!uuid_le_cmp(channel->offermsg.offer.if_type,
 205                        newchannel->offermsg.offer.if_type) &&
 206                        !uuid_le_cmp(channel->offermsg.offer.if_instance,
 207                                newchannel->offermsg.offer.if_instance)) {
 208                        fnew = false;
 209                        break;
 210                }
 211        }
 212
 213        if (fnew)
 214                list_add_tail(&newchannel->listentry,
 215                              &vmbus_connection.chn_list);
 216
 217        spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 218
 219        if (!fnew) {
 220                free_channel(newchannel);
 221                return;
 222        }
 223
 224        /*
 225         * Start the process of binding this offer to the driver
 226         * We need to set the DeviceObject field before calling
 227         * vmbus_child_dev_add()
 228         */
 229        newchannel->device_obj = vmbus_device_create(
 230                &newchannel->offermsg.offer.if_type,
 231                &newchannel->offermsg.offer.if_instance,
 232                newchannel);
 233
 234        /*
 235         * Add the new device to the bus. This will kick off device-driver
 236         * binding which eventually invokes the device driver's AddDevice()
 237         * method.
 238         */
 239        ret = vmbus_device_register(newchannel->device_obj);
 240        if (ret != 0) {
 241                pr_err("unable to add child device object (relid %d)\n",
 242                           newchannel->offermsg.child_relid);
 243
 244                spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 245                list_del(&newchannel->listentry);
 246                spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 247                kfree(newchannel->device_obj);
 248
 249                free_channel(newchannel);
 250        } else {
 251                /*
 252                 * This state is used to indicate a successful open
 253                 * so that when we do close the channel normally, we
 254                 * can cleanup properly
 255                 */
 256                newchannel->state = CHANNEL_OPEN_STATE;
 257        }
 258}
 259
 260enum {
 261        IDE = 0,
 262        SCSI,
 263        NIC,
 264        MAX_PERF_CHN,
 265};
 266
 267/*
 268 * This is an array of device_ids (device types) that are performance critical.
 269 * We attempt to distribute the interrupt load for these devices across
 270 * all available CPUs.
 271 */
 272static const struct hv_vmbus_device_id hp_devs[] = {
 273        /* IDE */
 274        { HV_IDE_GUID, },
 275        /* Storage - SCSI */
 276        { HV_SCSI_GUID, },
 277        /* Network */
 278        { HV_NIC_GUID, },
 279};
 280
 281
 282/*
 283 * We use this state to statically distribute the channel interrupt load.
 284 */
 285static u32  next_vp;
 286
 287/*
 288 * Starting with Win8, we can statically distribute the incoming
 289 * channel interrupt load by binding a channel to VCPU. We
 290 * implement here a simple round robin scheme for distributing
 291 * the interrupt load.
 292 * We will bind channels that are not performance critical to cpu 0 and
 293 * performance critical channels (IDE, SCSI and Network) will be uniformly
 294 * distributed across all available CPUs.
 295 */
 296static u32 get_vp_index(uuid_le *type_guid)
 297{
 298        u32 cur_cpu;
 299        int i;
 300        bool perf_chn = false;
 301        u32 max_cpus = num_online_cpus();
 302
 303        for (i = IDE; i < MAX_PERF_CHN; i++) {
 304                if (!memcmp(type_guid->b, hp_devs[i].guid,
 305                                 sizeof(uuid_le))) {
 306                        perf_chn = true;
 307                        break;
 308                }
 309        }
 310        if ((vmbus_proto_version == VERSION_WS2008) ||
 311            (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) {
 312                /*
 313                 * Prior to win8, all channel interrupts are
 314                 * delivered on cpu 0.
 315                 * Also if the channel is not a performance critical
 316                 * channel, bind it to cpu 0.
 317                 */
 318                return 0;
 319        }
 320        cur_cpu = (++next_vp % max_cpus);
 321        return cur_cpu;
 322}
 323
 324/*
 325 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
 326 *
 327 */
 328static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
 329{
 330        struct vmbus_channel_offer_channel *offer;
 331        struct vmbus_channel *newchannel;
 332
 333        offer = (struct vmbus_channel_offer_channel *)hdr;
 334
 335        /* Allocate the channel object and save this offer. */
 336        newchannel = alloc_channel();
 337        if (!newchannel) {
 338                pr_err("Unable to allocate channel object\n");
 339                return;
 340        }
 341
 342        /*
 343         * By default we setup state to enable batched
 344         * reading. A specific service can choose to
 345         * disable this prior to opening the channel.
 346         */
 347        newchannel->batched_reading = true;
 348
 349        /*
 350         * Setup state for signalling the host.
 351         */
 352        newchannel->sig_event = (struct hv_input_signal_event *)
 353                                (ALIGN((unsigned long)
 354                                &newchannel->sig_buf,
 355                                HV_HYPERCALL_PARAM_ALIGN));
 356
 357        newchannel->sig_event->connectionid.asu32 = 0;
 358        newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID;
 359        newchannel->sig_event->flag_number = 0;
 360        newchannel->sig_event->rsvdz = 0;
 361
 362        if (vmbus_proto_version != VERSION_WS2008) {
 363                newchannel->is_dedicated_interrupt =
 364                                (offer->is_dedicated_interrupt != 0);
 365                newchannel->sig_event->connectionid.u.id =
 366                                offer->connection_id;
 367        }
 368
 369        newchannel->target_vp = get_vp_index(&offer->offer.if_type);
 370
 371        memcpy(&newchannel->offermsg, offer,
 372               sizeof(struct vmbus_channel_offer_channel));
 373        newchannel->monitor_grp = (u8)offer->monitorid / 32;
 374        newchannel->monitor_bit = (u8)offer->monitorid % 32;
 375
 376        INIT_WORK(&newchannel->work, vmbus_process_offer);
 377        queue_work(newchannel->controlwq, &newchannel->work);
 378}
 379
 380/*
 381 * vmbus_onoffer_rescind - Rescind offer handler.
 382 *
 383 * We queue a work item to process this offer synchronously
 384 */
 385static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
 386{
 387        struct vmbus_channel_rescind_offer *rescind;
 388        struct vmbus_channel *channel;
 389
 390        rescind = (struct vmbus_channel_rescind_offer *)hdr;
 391        channel = relid2channel(rescind->child_relid);
 392
 393        if (channel == NULL)
 394                /* Just return here, no channel found */
 395                return;
 396
 397        /* work is initialized for vmbus_process_rescind_offer() from
 398         * vmbus_process_offer() where the channel got created */
 399        queue_work(channel->controlwq, &channel->work);
 400}
 401
 402/*
 403 * vmbus_onoffers_delivered -
 404 * This is invoked when all offers have been delivered.
 405 *
 406 * Nothing to do here.
 407 */
 408static void vmbus_onoffers_delivered(
 409                        struct vmbus_channel_message_header *hdr)
 410{
 411}
 412
 413/*
 414 * vmbus_onopen_result - Open result handler.
 415 *
 416 * This is invoked when we received a response to our channel open request.
 417 * Find the matching request, copy the response and signal the requesting
 418 * thread.
 419 */
 420static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
 421{
 422        struct vmbus_channel_open_result *result;
 423        struct vmbus_channel_msginfo *msginfo;
 424        struct vmbus_channel_message_header *requestheader;
 425        struct vmbus_channel_open_channel *openmsg;
 426        unsigned long flags;
 427
 428        result = (struct vmbus_channel_open_result *)hdr;
 429
 430        /*
 431         * Find the open msg, copy the result and signal/unblock the wait event
 432         */
 433        spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 434
 435        list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 436                                msglistentry) {
 437                requestheader =
 438                        (struct vmbus_channel_message_header *)msginfo->msg;
 439
 440                if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
 441                        openmsg =
 442                        (struct vmbus_channel_open_channel *)msginfo->msg;
 443                        if (openmsg->child_relid == result->child_relid &&
 444                            openmsg->openid == result->openid) {
 445                                memcpy(&msginfo->response.open_result,
 446                                       result,
 447                                       sizeof(
 448                                        struct vmbus_channel_open_result));
 449                                complete(&msginfo->waitevent);
 450                                break;
 451                        }
 452                }
 453        }
 454        spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 455}
 456
 457/*
 458 * vmbus_ongpadl_created - GPADL created handler.
 459 *
 460 * This is invoked when we received a response to our gpadl create request.
 461 * Find the matching request, copy the response and signal the requesting
 462 * thread.
 463 */
 464static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
 465{
 466        struct vmbus_channel_gpadl_created *gpadlcreated;
 467        struct vmbus_channel_msginfo *msginfo;
 468        struct vmbus_channel_message_header *requestheader;
 469        struct vmbus_channel_gpadl_header *gpadlheader;
 470        unsigned long flags;
 471
 472        gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
 473
 474        /*
 475         * Find the establish msg, copy the result and signal/unblock the wait
 476         * event
 477         */
 478        spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 479
 480        list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 481                                msglistentry) {
 482                requestheader =
 483                        (struct vmbus_channel_message_header *)msginfo->msg;
 484
 485                if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
 486                        gpadlheader =
 487                        (struct vmbus_channel_gpadl_header *)requestheader;
 488
 489                        if ((gpadlcreated->child_relid ==
 490                             gpadlheader->child_relid) &&
 491                            (gpadlcreated->gpadl == gpadlheader->gpadl)) {
 492                                memcpy(&msginfo->response.gpadl_created,
 493                                       gpadlcreated,
 494                                       sizeof(
 495                                        struct vmbus_channel_gpadl_created));
 496                                complete(&msginfo->waitevent);
 497                                break;
 498                        }
 499                }
 500        }
 501        spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 502}
 503
 504/*
 505 * vmbus_ongpadl_torndown - GPADL torndown handler.
 506 *
 507 * This is invoked when we received a response to our gpadl teardown request.
 508 * Find the matching request, copy the response and signal the requesting
 509 * thread.
 510 */
 511static void vmbus_ongpadl_torndown(
 512                        struct vmbus_channel_message_header *hdr)
 513{
 514        struct vmbus_channel_gpadl_torndown *gpadl_torndown;
 515        struct vmbus_channel_msginfo *msginfo;
 516        struct vmbus_channel_message_header *requestheader;
 517        struct vmbus_channel_gpadl_teardown *gpadl_teardown;
 518        unsigned long flags;
 519
 520        gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 521
 522        /*
 523         * Find the open msg, copy the result and signal/unblock the wait event
 524         */
 525        spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 526
 527        list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 528                                msglistentry) {
 529                requestheader =
 530                        (struct vmbus_channel_message_header *)msginfo->msg;
 531
 532                if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
 533                        gpadl_teardown =
 534                        (struct vmbus_channel_gpadl_teardown *)requestheader;
 535
 536                        if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
 537                                memcpy(&msginfo->response.gpadl_torndown,
 538                                       gpadl_torndown,
 539                                       sizeof(
 540                                        struct vmbus_channel_gpadl_torndown));
 541                                complete(&msginfo->waitevent);
 542                                break;
 543                        }
 544                }
 545        }
 546        spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 547}
 548
 549/*
 550 * vmbus_onversion_response - Version response handler
 551 *
 552 * This is invoked when we received a response to our initiate contact request.
 553 * Find the matching request, copy the response and signal the requesting
 554 * thread.
 555 */
 556static void vmbus_onversion_response(
 557                struct vmbus_channel_message_header *hdr)
 558{
 559        struct vmbus_channel_msginfo *msginfo;
 560        struct vmbus_channel_message_header *requestheader;
 561        struct vmbus_channel_version_response *version_response;
 562        unsigned long flags;
 563
 564        version_response = (struct vmbus_channel_version_response *)hdr;
 565        spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 566
 567        list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 568                                msglistentry) {
 569                requestheader =
 570                        (struct vmbus_channel_message_header *)msginfo->msg;
 571
 572                if (requestheader->msgtype ==
 573                    CHANNELMSG_INITIATE_CONTACT) {
 574                        memcpy(&msginfo->response.version_response,
 575                              version_response,
 576                              sizeof(struct vmbus_channel_version_response));
 577                        complete(&msginfo->waitevent);
 578                }
 579        }
 580        spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 581}
 582
 583/* Channel message dispatch table */
 584static struct vmbus_channel_message_table_entry
 585        channel_message_table[CHANNELMSG_COUNT] = {
 586        {CHANNELMSG_INVALID,                    NULL},
 587        {CHANNELMSG_OFFERCHANNEL,               vmbus_onoffer},
 588        {CHANNELMSG_RESCIND_CHANNELOFFER,       vmbus_onoffer_rescind},
 589        {CHANNELMSG_REQUESTOFFERS,              NULL},
 590        {CHANNELMSG_ALLOFFERS_DELIVERED,        vmbus_onoffers_delivered},
 591        {CHANNELMSG_OPENCHANNEL,                NULL},
 592        {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
 593        {CHANNELMSG_CLOSECHANNEL,               NULL},
 594        {CHANNELMSG_GPADL_HEADER,               NULL},
 595        {CHANNELMSG_GPADL_BODY,         NULL},
 596        {CHANNELMSG_GPADL_CREATED,              vmbus_ongpadl_created},
 597        {CHANNELMSG_GPADL_TEARDOWN,             NULL},
 598        {CHANNELMSG_GPADL_TORNDOWN,             vmbus_ongpadl_torndown},
 599        {CHANNELMSG_RELID_RELEASED,             NULL},
 600        {CHANNELMSG_INITIATE_CONTACT,           NULL},
 601        {CHANNELMSG_VERSION_RESPONSE,           vmbus_onversion_response},
 602        {CHANNELMSG_UNLOAD,                     NULL},
 603};
 604
 605/*
 606 * vmbus_onmessage - Handler for channel protocol messages.
 607 *
 608 * This is invoked in the vmbus worker thread context.
 609 */
 610void vmbus_onmessage(void *context)
 611{
 612        struct hv_message *msg = context;
 613        struct vmbus_channel_message_header *hdr;
 614        int size;
 615
 616        hdr = (struct vmbus_channel_message_header *)msg->u.payload;
 617        size = msg->header.payload_size;
 618
 619        if (hdr->msgtype >= CHANNELMSG_COUNT) {
 620                pr_err("Received invalid channel message type %d size %d\n",
 621                           hdr->msgtype, size);
 622                print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 623                                     (unsigned char *)msg->u.payload, size);
 624                return;
 625        }
 626
 627        if (channel_message_table[hdr->msgtype].message_handler)
 628                channel_message_table[hdr->msgtype].message_handler(hdr);
 629        else
 630                pr_err("Unhandled channel message type %d\n", hdr->msgtype);
 631}
 632
 633/*
 634 * vmbus_request_offers - Send a request to get all our pending offers.
 635 */
 636int vmbus_request_offers(void)
 637{
 638        struct vmbus_channel_message_header *msg;
 639        struct vmbus_channel_msginfo *msginfo;
 640        int ret, t;
 641
 642        msginfo = kmalloc(sizeof(*msginfo) +
 643                          sizeof(struct vmbus_channel_message_header),
 644                          GFP_KERNEL);
 645        if (!msginfo)
 646                return -ENOMEM;
 647
 648        init_completion(&msginfo->waitevent);
 649
 650        msg = (struct vmbus_channel_message_header *)msginfo->msg;
 651
 652        msg->msgtype = CHANNELMSG_REQUESTOFFERS;
 653
 654
 655        ret = vmbus_post_msg(msg,
 656                               sizeof(struct vmbus_channel_message_header));
 657        if (ret != 0) {
 658                pr_err("Unable to request offers - %d\n", ret);
 659
 660                goto cleanup;
 661        }
 662
 663        t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
 664        if (t == 0) {
 665                ret = -ETIMEDOUT;
 666                goto cleanup;
 667        }
 668
 669
 670
 671cleanup:
 672        kfree(msginfo);
 673
 674        return ret;
 675}
 676
 677/* eof */
 678
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