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21#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/slab.h>
24#include <linux/list.h>
25#include <linux/module.h>
26#include <linux/completion.h>
27#include "osd.h"
28#include "logging.h"
29#include "vmbus_private.h"
30#include "utils.h"
31
32struct vmbus_channel_message_table_entry {
33 enum vmbus_channel_message_type messageType;
34 void (*messageHandler)(struct vmbus_channel_message_header *msg);
35};
36
37#define MAX_MSG_TYPES 3
38#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 7
39
40static const struct hv_guid
41 gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
42
43
44 {
45 .data = {
46 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
47 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
48 }
49 },
50
51
52
53 {
54 .data = {
55 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
56 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
57 }
58 },
59
60
61
62 {
63 .data = {
64 0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
65 0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
66 }
67 },
68
69
70
71 {
72 .data = {
73 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
74 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
75 }
76 },
77
78
79 {
80 .data = {
81 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
82 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
83 }
84 },
85
86
87 {
88 .data = {
89 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
90 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
91 }
92 },
93
94
95 {
96 .data = {
97 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
98 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
99 }
100 },
101};
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
120 struct icmsg_negotiate *negop,
121 u8 *buf)
122{
123 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
124 icmsghdrp->icmsgsize = 0x10;
125
126 negop = (struct icmsg_negotiate *)&buf[
127 sizeof(struct vmbuspipe_hdr) +
128 sizeof(struct icmsg_hdr)];
129
130 if (negop->icframe_vercnt == 2 &&
131 negop->icversion_data[1].major == 3) {
132 negop->icversion_data[0].major = 3;
133 negop->icversion_data[0].minor = 0;
134 negop->icversion_data[1].major = 3;
135 negop->icversion_data[1].minor = 0;
136 } else {
137 negop->icversion_data[0].major = 1;
138 negop->icversion_data[0].minor = 0;
139 negop->icversion_data[1].major = 1;
140 negop->icversion_data[1].minor = 0;
141 }
142
143 negop->icframe_vercnt = 1;
144 negop->icmsg_vercnt = 1;
145 }
146}
147EXPORT_SYMBOL(prep_negotiate_resp);
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162void chn_cb_negotiate(void *context)
163{
164 struct vmbus_channel *channel = context;
165 u8 *buf;
166 u32 buflen, recvlen;
167 u64 requestid;
168
169 struct icmsg_hdr *icmsghdrp;
170 struct icmsg_negotiate *negop = NULL;
171
172 buflen = PAGE_SIZE;
173 buf = kmalloc(buflen, GFP_ATOMIC);
174
175 vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
176
177 if (recvlen > 0) {
178 icmsghdrp = (struct icmsg_hdr *)&buf[
179 sizeof(struct vmbuspipe_hdr)];
180
181 prep_negotiate_resp(icmsghdrp, negop, buf);
182
183 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
184 | ICMSGHDRFLAG_RESPONSE;
185
186 vmbus_sendpacket(channel, buf,
187 recvlen, requestid,
188 VmbusPacketTypeDataInBand, 0);
189 }
190
191 kfree(buf);
192}
193EXPORT_SYMBOL(chn_cb_negotiate);
194
195
196
197
198
199struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
200
201
202 {
203 .msg_type = HV_SHUTDOWN_MSG,
204 .data = {
205 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
206 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
207 },
208 .callback = chn_cb_negotiate,
209 .log_msg = "Shutdown channel functionality initialized"
210 },
211
212
213
214 {
215 .msg_type = HV_TIMESYNC_MSG,
216 .data = {
217 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
218 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
219 },
220 .callback = chn_cb_negotiate,
221 .log_msg = "Timesync channel functionality initialized"
222 },
223
224
225 {
226 .msg_type = HV_HEARTBEAT_MSG,
227 .data = {
228 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
229 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
230 },
231 .callback = chn_cb_negotiate,
232 .log_msg = "Heartbeat channel functionality initialized"
233 },
234};
235EXPORT_SYMBOL(hv_cb_utils);
236
237
238
239
240static struct vmbus_channel *alloc_channel(void)
241{
242 struct vmbus_channel *channel;
243
244 channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
245 if (!channel)
246 return NULL;
247
248 spin_lock_init(&channel->inbound_lock);
249
250 init_timer(&channel->poll_timer);
251 channel->poll_timer.data = (unsigned long)channel;
252 channel->poll_timer.function = vmbus_ontimer;
253
254 channel->controlwq = create_workqueue("hv_vmbus_ctl");
255 if (!channel->controlwq) {
256 kfree(channel);
257 return NULL;
258 }
259
260 return channel;
261}
262
263
264
265
266static void release_channel(struct work_struct *work)
267{
268 struct vmbus_channel *channel = container_of(work,
269 struct vmbus_channel,
270 work);
271
272 DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
273 destroy_workqueue(channel->controlwq);
274 DPRINT_DBG(VMBUS, "channel released (%p)", channel);
275
276 kfree(channel);
277}
278
279
280
281
282void free_channel(struct vmbus_channel *channel)
283{
284 del_timer_sync(&channel->poll_timer);
285
286
287
288
289
290
291 INIT_WORK(&channel->work, release_channel);
292 queue_work(gVmbusConnection.WorkQueue, &channel->work);
293}
294
295
296DECLARE_COMPLETION(hv_channel_ready);
297
298
299
300
301
302static void count_hv_channel(void)
303{
304 static int counter;
305 unsigned long flags;
306
307 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
308 if (++counter == MAX_MSG_TYPES)
309 complete(&hv_channel_ready);
310 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
311}
312
313
314
315
316
317static void vmbus_process_rescind_offer(struct work_struct *work)
318{
319 struct vmbus_channel *channel = container_of(work,
320 struct vmbus_channel,
321 work);
322
323 vmbus_child_device_unregister(channel->device_obj);
324}
325
326
327
328
329
330static void vmbus_process_offer(struct work_struct *work)
331{
332 struct vmbus_channel *newchannel = container_of(work,
333 struct vmbus_channel,
334 work);
335 struct vmbus_channel *channel;
336 bool fnew = true;
337 int ret;
338 int cnt;
339 unsigned long flags;
340
341
342 INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
343
344
345 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
346
347 list_for_each_entry(channel, &gVmbusConnection.ChannelList, listentry) {
348 if (!memcmp(&channel->offermsg.offer.InterfaceType,
349 &newchannel->offermsg.offer.InterfaceType,
350 sizeof(struct hv_guid)) &&
351 !memcmp(&channel->offermsg.offer.InterfaceInstance,
352 &newchannel->offermsg.offer.InterfaceInstance,
353 sizeof(struct hv_guid))) {
354 fnew = false;
355 break;
356 }
357 }
358
359 if (fnew)
360 list_add_tail(&newchannel->listentry,
361 &gVmbusConnection.ChannelList);
362
363 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
364
365 if (!fnew) {
366 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
367 newchannel->offermsg.child_relid);
368 free_channel(newchannel);
369 return;
370 }
371
372
373
374
375
376
377 newchannel->device_obj = vmbus_child_device_create(
378 &newchannel->offermsg.offer.InterfaceType,
379 &newchannel->offermsg.offer.InterfaceInstance,
380 newchannel);
381
382 DPRINT_DBG(VMBUS, "child device object allocated - %p",
383 newchannel->device_obj);
384
385
386
387
388
389
390 ret = VmbusChildDeviceAdd(newchannel->device_obj);
391 if (ret != 0) {
392 DPRINT_ERR(VMBUS,
393 "unable to add child device object (relid %d)",
394 newchannel->offermsg.child_relid);
395
396 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
397 list_del(&newchannel->listentry);
398 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
399
400 free_channel(newchannel);
401 } else {
402
403
404
405
406
407 newchannel->state = CHANNEL_OPEN_STATE;
408
409
410 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
411 if (memcmp(&newchannel->offermsg.offer.InterfaceType,
412 &hv_cb_utils[cnt].data,
413 sizeof(struct hv_guid)) == 0 &&
414 vmbus_open(newchannel, 2 * PAGE_SIZE,
415 2 * PAGE_SIZE, NULL, 0,
416 hv_cb_utils[cnt].callback,
417 newchannel) == 0) {
418 hv_cb_utils[cnt].channel = newchannel;
419 DPRINT_INFO(VMBUS, "%s",
420 hv_cb_utils[cnt].log_msg);
421 count_hv_channel();
422 }
423 }
424 }
425}
426
427
428
429
430
431
432
433
434static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
435{
436 struct vmbus_channel_offer_channel *offer;
437 struct vmbus_channel *newchannel;
438 struct hv_guid *guidtype;
439 struct hv_guid *guidinstance;
440 int i;
441 int fsupported = 0;
442
443 offer = (struct vmbus_channel_offer_channel *)hdr;
444 for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
445 if (memcmp(&offer->offer.InterfaceType,
446 &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
447 fsupported = 1;
448 break;
449 }
450 }
451
452 if (!fsupported) {
453 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
454 "child relid %d", offer->child_relid);
455 return;
456 }
457
458 guidtype = &offer->offer.InterfaceType;
459 guidinstance = &offer->offer.InterfaceInstance;
460
461 DPRINT_INFO(VMBUS, "Channel offer notification - "
462 "child relid %d monitor id %d allocated %d, "
463 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
464 "%02x%02x%02x%02x%02x%02x%02x%02x} "
465 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
466 "%02x%02x%02x%02x%02x%02x%02x%02x}",
467 offer->child_relid, offer->monitorid,
468 offer->monitor_allocated,
469 guidtype->data[3], guidtype->data[2],
470 guidtype->data[1], guidtype->data[0],
471 guidtype->data[5], guidtype->data[4],
472 guidtype->data[7], guidtype->data[6],
473 guidtype->data[8], guidtype->data[9],
474 guidtype->data[10], guidtype->data[11],
475 guidtype->data[12], guidtype->data[13],
476 guidtype->data[14], guidtype->data[15],
477 guidinstance->data[3], guidinstance->data[2],
478 guidinstance->data[1], guidinstance->data[0],
479 guidinstance->data[5], guidinstance->data[4],
480 guidinstance->data[7], guidinstance->data[6],
481 guidinstance->data[8], guidinstance->data[9],
482 guidinstance->data[10], guidinstance->data[11],
483 guidinstance->data[12], guidinstance->data[13],
484 guidinstance->data[14], guidinstance->data[15]);
485
486
487 newchannel = alloc_channel();
488 if (!newchannel) {
489 DPRINT_ERR(VMBUS, "unable to allocate channel object");
490 return;
491 }
492
493 DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
494
495 memcpy(&newchannel->offermsg, offer,
496 sizeof(struct vmbus_channel_offer_channel));
497 newchannel->monitor_grp = (u8)offer->monitorid / 32;
498 newchannel->monitor_bit = (u8)offer->monitorid % 32;
499
500
501 INIT_WORK(&newchannel->work, vmbus_process_offer);
502 queue_work(newchannel->controlwq, &newchannel->work);
503}
504
505
506
507
508
509
510static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
511{
512 struct vmbus_channel_rescind_offer *rescind;
513 struct vmbus_channel *channel;
514
515 rescind = (struct vmbus_channel_rescind_offer *)hdr;
516 channel = GetChannelFromRelId(rescind->child_relid);
517 if (channel == NULL) {
518 DPRINT_DBG(VMBUS, "channel not found for relId %d",
519 rescind->child_relid);
520 return;
521 }
522
523
524
525 queue_work(channel->controlwq, &channel->work);
526}
527
528
529
530
531
532
533
534static void vmbus_onoffers_delivered(
535 struct vmbus_channel_message_header *hdr)
536{
537}
538
539
540
541
542
543
544
545
546static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
547{
548 struct vmbus_channel_open_result *result;
549 struct list_head *curr;
550 struct vmbus_channel_msginfo *msginfo;
551 struct vmbus_channel_message_header *requestheader;
552 struct vmbus_channel_open_channel *openmsg;
553 unsigned long flags;
554
555 result = (struct vmbus_channel_open_result *)hdr;
556 DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
557
558
559
560
561 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
562
563 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
564
565 msginfo = (struct vmbus_channel_msginfo *)curr;
566 requestheader =
567 (struct vmbus_channel_message_header *)msginfo->msg;
568
569 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
570 openmsg =
571 (struct vmbus_channel_open_channel *)msginfo->msg;
572 if (openmsg->child_relid == result->child_relid &&
573 openmsg->openid == result->openid) {
574 memcpy(&msginfo->response.open_result,
575 result,
576 sizeof(struct vmbus_channel_open_result));
577 osd_waitevent_set(msginfo->waitevent);
578 break;
579 }
580 }
581 }
582 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
583}
584
585
586
587
588
589
590
591
592static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
593{
594 struct vmbus_channel_gpadl_created *gpadlcreated;
595 struct list_head *curr;
596 struct vmbus_channel_msginfo *msginfo;
597 struct vmbus_channel_message_header *requestheader;
598 struct vmbus_channel_gpadl_header *gpadlheader;
599 unsigned long flags;
600
601 gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
602 DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
603 gpadlcreated->creation_status);
604
605
606
607
608
609 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
610
611 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
612
613 msginfo = (struct vmbus_channel_msginfo *)curr;
614 requestheader =
615 (struct vmbus_channel_message_header *)msginfo->msg;
616
617 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
618 gpadlheader =
619 (struct vmbus_channel_gpadl_header *)requestheader;
620
621 if ((gpadlcreated->child_relid ==
622 gpadlheader->child_relid) &&
623 (gpadlcreated->gpadl == gpadlheader->gpadl)) {
624 memcpy(&msginfo->response.gpadl_created,
625 gpadlcreated,
626 sizeof(struct vmbus_channel_gpadl_created));
627 osd_waitevent_set(msginfo->waitevent);
628 break;
629 }
630 }
631 }
632 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
633}
634
635
636
637
638
639
640
641
642static void vmbus_ongpadl_torndown(
643 struct vmbus_channel_message_header *hdr)
644{
645 struct vmbus_channel_gpadl_torndown *gpadl_torndown;
646 struct list_head *curr;
647 struct vmbus_channel_msginfo *msginfo;
648 struct vmbus_channel_message_header *requestheader;
649 struct vmbus_channel_gpadl_teardown *gpadl_teardown;
650 unsigned long flags;
651
652 gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
653
654
655
656
657 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
658
659 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
660
661 msginfo = (struct vmbus_channel_msginfo *)curr;
662 requestheader =
663 (struct vmbus_channel_message_header *)msginfo->msg;
664
665 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
666 gpadl_teardown =
667 (struct vmbus_channel_gpadl_teardown *)requestheader;
668
669 if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
670 memcpy(&msginfo->response.gpadl_torndown,
671 gpadl_torndown,
672 sizeof(struct vmbus_channel_gpadl_torndown));
673 osd_waitevent_set(msginfo->waitevent);
674 break;
675 }
676 }
677 }
678 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
679}
680
681
682
683
684
685
686
687
688static void vmbus_onversion_response(
689 struct vmbus_channel_message_header *hdr)
690{
691 struct list_head *curr;
692 struct vmbus_channel_msginfo *msginfo;
693 struct vmbus_channel_message_header *requestheader;
694 struct vmbus_channel_initiate_contact *initiate;
695 struct vmbus_channel_version_response *version_response;
696 unsigned long flags;
697
698 version_response = (struct vmbus_channel_version_response *)hdr;
699 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
700
701 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
702
703 msginfo = (struct vmbus_channel_msginfo *)curr;
704 requestheader =
705 (struct vmbus_channel_message_header *)msginfo->msg;
706
707 if (requestheader->msgtype ==
708 CHANNELMSG_INITIATE_CONTACT) {
709 initiate =
710 (struct vmbus_channel_initiate_contact *)requestheader;
711 memcpy(&msginfo->response.version_response,
712 version_response,
713 sizeof(struct vmbus_channel_version_response));
714 osd_waitevent_set(msginfo->waitevent);
715 }
716 }
717 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
718}
719
720
721static struct vmbus_channel_message_table_entry
722 gChannelMessageTable[CHANNELMSG_COUNT] = {
723 {CHANNELMSG_INVALID, NULL},
724 {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
725 {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
726 {CHANNELMSG_REQUESTOFFERS, NULL},
727 {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
728 {CHANNELMSG_OPENCHANNEL, NULL},
729 {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
730 {CHANNELMSG_CLOSECHANNEL, NULL},
731 {CHANNELMSG_GPADL_HEADER, NULL},
732 {CHANNELMSG_GPADL_BODY, NULL},
733 {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
734 {CHANNELMSG_GPADL_TEARDOWN, NULL},
735 {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
736 {CHANNELMSG_RELID_RELEASED, NULL},
737 {CHANNELMSG_INITIATE_CONTACT, NULL},
738 {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
739 {CHANNELMSG_UNLOAD, NULL},
740};
741
742
743
744
745
746
747void vmbus_onmessage(void *context)
748{
749 struct hv_message *msg = context;
750 struct vmbus_channel_message_header *hdr;
751 int size;
752
753 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
754 size = msg->header.payload_size;
755
756 DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
757
758 if (hdr->msgtype >= CHANNELMSG_COUNT) {
759 DPRINT_ERR(VMBUS,
760 "Received invalid channel message type %d size %d",
761 hdr->msgtype, size);
762 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
763 (unsigned char *)msg->u.payload, size);
764 return;
765 }
766
767 if (gChannelMessageTable[hdr->msgtype].messageHandler)
768 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
769 else
770 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
771 hdr->msgtype);
772}
773
774
775
776
777int vmbus_request_offers(void)
778{
779 struct vmbus_channel_message_header *msg;
780 struct vmbus_channel_msginfo *msginfo;
781 int ret;
782
783 msginfo = kmalloc(sizeof(*msginfo) +
784 sizeof(struct vmbus_channel_message_header),
785 GFP_KERNEL);
786 if (!msginfo)
787 return -ENOMEM;
788
789 msginfo->waitevent = osd_waitevent_create();
790 if (!msginfo->waitevent) {
791 kfree(msginfo);
792 return -ENOMEM;
793 }
794
795 msg = (struct vmbus_channel_message_header *)msginfo->msg;
796
797 msg->msgtype = CHANNELMSG_REQUESTOFFERS;
798
799
800
801
802
803
804 ret = VmbusPostMessage(msg,
805 sizeof(struct vmbus_channel_message_header));
806 if (ret != 0) {
807 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
808
809
810
811
812
813 goto Cleanup;
814 }
815
816
817
818
819
820
821
822Cleanup:
823 if (msginfo) {
824 kfree(msginfo->waitevent);
825 kfree(msginfo);
826 }
827
828 return ret;
829}
830
831
832
833
834
835void vmbus_release_unattached_channels(void)
836{
837 struct vmbus_channel *channel, *pos;
838 struct vmbus_channel *start = NULL;
839 unsigned long flags;
840
841 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
842
843 list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
844 listentry) {
845 if (channel == start)
846 break;
847
848 if (!channel->device_obj->Driver) {
849 list_del(&channel->listentry);
850 DPRINT_INFO(VMBUS,
851 "Releasing unattached device object %p",
852 channel->device_obj);
853
854 vmbus_child_device_unregister(channel->device_obj);
855 free_channel(channel);
856 } else {
857 if (!start)
858 start = channel;
859 }
860 }
861
862 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
863}
864
865
866