net: call rcu_read_lock early in process_backlog
[pandora-kernel.git] / net / caif / cfctrl.c
1 /*
2  * Copyright (C) ST-Ericsson AB 2010
3  * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
4  * License terms: GNU General Public License (GPL) version 2
5  */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8
9 #include <linux/stddef.h>
10 #include <linux/spinlock.h>
11 #include <linux/slab.h>
12 #include <net/caif/caif_layer.h>
13 #include <net/caif/cfpkt.h>
14 #include <net/caif/cfctrl.h>
15
16 #define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
17 #define UTILITY_NAME_LENGTH 16
18 #define CFPKT_CTRL_PKT_LEN 20
19
20 #ifdef CAIF_NO_LOOP
21 static int handle_loop(struct cfctrl *ctrl,
22                               int cmd, struct cfpkt *pkt){
23         return -1;
24 }
25 #else
26 static int handle_loop(struct cfctrl *ctrl,
27                 int cmd, struct cfpkt *pkt);
28 #endif
29 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
30 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
31                            int phyid);
32
33
34 struct cflayer *cfctrl_create(void)
35 {
36         struct dev_info dev_info;
37         struct cfctrl *this =
38                 kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
39         if (!this)
40                 return NULL;
41         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
42         memset(&dev_info, 0, sizeof(dev_info));
43         dev_info.id = 0xff;
44         cfsrvl_init(&this->serv, 0, &dev_info, false);
45         atomic_set(&this->req_seq_no, 1);
46         atomic_set(&this->rsp_seq_no, 1);
47         this->serv.layer.receive = cfctrl_recv;
48         sprintf(this->serv.layer.name, "ctrl");
49         this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
50 #ifndef CAIF_NO_LOOP
51         spin_lock_init(&this->loop_linkid_lock);
52         this->loop_linkid = 1;
53 #endif
54         spin_lock_init(&this->info_list_lock);
55         INIT_LIST_HEAD(&this->list);
56         return &this->serv.layer;
57 }
58
59 void cfctrl_remove(struct cflayer *layer)
60 {
61         struct cfctrl_request_info *p, *tmp;
62         struct cfctrl *ctrl = container_obj(layer);
63
64         spin_lock_bh(&ctrl->info_list_lock);
65         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
66                 list_del(&p->list);
67                 kfree(p);
68         }
69         spin_unlock_bh(&ctrl->info_list_lock);
70         kfree(layer);
71 }
72
73 static bool param_eq(const struct cfctrl_link_param *p1,
74                         const struct cfctrl_link_param *p2)
75 {
76         bool eq =
77             p1->linktype == p2->linktype &&
78             p1->priority == p2->priority &&
79             p1->phyid == p2->phyid &&
80             p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
81
82         if (!eq)
83                 return false;
84
85         switch (p1->linktype) {
86         case CFCTRL_SRV_VEI:
87                 return true;
88         case CFCTRL_SRV_DATAGRAM:
89                 return p1->u.datagram.connid == p2->u.datagram.connid;
90         case CFCTRL_SRV_RFM:
91                 return
92                     p1->u.rfm.connid == p2->u.rfm.connid &&
93                     strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
94         case CFCTRL_SRV_UTIL:
95                 return
96                     p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
97                     && p1->u.utility.fifosize_bufs ==
98                     p2->u.utility.fifosize_bufs
99                     && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
100                     && p1->u.utility.paramlen == p2->u.utility.paramlen
101                     && memcmp(p1->u.utility.params, p2->u.utility.params,
102                               p1->u.utility.paramlen) == 0;
103
104         case CFCTRL_SRV_VIDEO:
105                 return p1->u.video.connid == p2->u.video.connid;
106         case CFCTRL_SRV_DBG:
107                 return true;
108         case CFCTRL_SRV_DECM:
109                 return false;
110         default:
111                 return false;
112         }
113         return false;
114 }
115
116 static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
117                           const struct cfctrl_request_info *r2)
118 {
119         if (r1->cmd != r2->cmd)
120                 return false;
121         if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
122                 return param_eq(&r1->param, &r2->param);
123         else
124                 return r1->channel_id == r2->channel_id;
125 }
126
127 /* Insert request at the end */
128 static void cfctrl_insert_req(struct cfctrl *ctrl,
129                               struct cfctrl_request_info *req)
130 {
131         spin_lock_bh(&ctrl->info_list_lock);
132         atomic_inc(&ctrl->req_seq_no);
133         req->sequence_no = atomic_read(&ctrl->req_seq_no);
134         list_add_tail(&req->list, &ctrl->list);
135         spin_unlock_bh(&ctrl->info_list_lock);
136 }
137
138 /* Compare and remove request */
139 static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
140                                                 struct cfctrl_request_info *req)
141 {
142         struct cfctrl_request_info *p, *tmp, *first;
143
144         first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
145
146         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
147                 if (cfctrl_req_eq(req, p)) {
148                         if (p != first)
149                                 pr_warn("Requests are not received in order\n");
150
151                         atomic_set(&ctrl->rsp_seq_no,
152                                          p->sequence_no);
153                         list_del(&p->list);
154                         goto out;
155                 }
156         }
157         p = NULL;
158 out:
159         return p;
160 }
161
162 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
163 {
164         struct cfctrl *this = container_obj(layer);
165         return &this->res;
166 }
167
168 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
169 {
170         info->hdr_len = 0;
171         info->channel_id = cfctrl->serv.layer.id;
172         info->dev_info = &cfctrl->serv.dev_info;
173 }
174
175 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
176 {
177         struct cfctrl *cfctrl = container_obj(layer);
178         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
179         struct cflayer *dn = cfctrl->serv.layer.dn;
180         if (!pkt)
181                 return;
182         if (!dn) {
183                 pr_debug("not able to send enum request\n");
184                 return;
185         }
186         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
187         init_info(cfpkt_info(pkt), cfctrl);
188         cfpkt_info(pkt)->dev_info->id = physlinkid;
189         cfctrl->serv.dev_info.id = physlinkid;
190         cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
191         cfpkt_addbdy(pkt, physlinkid);
192         dn->transmit(dn, pkt);
193 }
194
195 int cfctrl_linkup_request(struct cflayer *layer,
196                            struct cfctrl_link_param *param,
197                            struct cflayer *user_layer)
198 {
199         struct cfctrl *cfctrl = container_obj(layer);
200         u32 tmp32;
201         u16 tmp16;
202         u8 tmp8;
203         struct cfctrl_request_info *req;
204         int ret;
205         char utility_name[16];
206         struct cfpkt *pkt;
207         struct cflayer *dn = cfctrl->serv.layer.dn;
208
209         if (!dn) {
210                 pr_debug("not able to send linkup request\n");
211                 return -ENODEV;
212         }
213
214         if (cfctrl_cancel_req(layer, user_layer) > 0) {
215                 /* Slight Paranoia, check if already connecting */
216                 pr_err("Duplicate connect request for same client\n");
217                 WARN_ON(1);
218                 return -EALREADY;
219         }
220
221         pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
222         if (!pkt)
223                 return -ENOMEM;
224         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
225         cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
226         cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
227         cfpkt_addbdy(pkt, param->endpoint & 0x03);
228
229         switch (param->linktype) {
230         case CFCTRL_SRV_VEI:
231                 break;
232         case CFCTRL_SRV_VIDEO:
233                 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
234                 break;
235         case CFCTRL_SRV_DBG:
236                 break;
237         case CFCTRL_SRV_DATAGRAM:
238                 tmp32 = cpu_to_le32(param->u.datagram.connid);
239                 cfpkt_add_body(pkt, &tmp32, 4);
240                 break;
241         case CFCTRL_SRV_RFM:
242                 /* Construct a frame, convert DatagramConnectionID to network
243                  * format long and copy it out...
244                  */
245                 tmp32 = cpu_to_le32(param->u.rfm.connid);
246                 cfpkt_add_body(pkt, &tmp32, 4);
247                 /* Add volume name, including zero termination... */
248                 cfpkt_add_body(pkt, param->u.rfm.volume,
249                                strlen(param->u.rfm.volume) + 1);
250                 break;
251         case CFCTRL_SRV_UTIL:
252                 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
253                 cfpkt_add_body(pkt, &tmp16, 2);
254                 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
255                 cfpkt_add_body(pkt, &tmp16, 2);
256                 memset(utility_name, 0, sizeof(utility_name));
257                 strncpy(utility_name, param->u.utility.name,
258                         UTILITY_NAME_LENGTH - 1);
259                 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
260                 tmp8 = param->u.utility.paramlen;
261                 cfpkt_add_body(pkt, &tmp8, 1);
262                 cfpkt_add_body(pkt, param->u.utility.params,
263                                param->u.utility.paramlen);
264                 break;
265         default:
266                 pr_warn("Request setup of bad link type = %d\n",
267                         param->linktype);
268                 return -EINVAL;
269         }
270         req = kzalloc(sizeof(*req), GFP_KERNEL);
271         if (!req)
272                 return -ENOMEM;
273         req->client_layer = user_layer;
274         req->cmd = CFCTRL_CMD_LINK_SETUP;
275         req->param = *param;
276         cfctrl_insert_req(cfctrl, req);
277         init_info(cfpkt_info(pkt), cfctrl);
278         /*
279          * NOTE:Always send linkup and linkdown request on the same
280          *      device as the payload. Otherwise old queued up payload
281          *      might arrive with the newly allocated channel ID.
282          */
283         cfpkt_info(pkt)->dev_info->id = param->phyid;
284         ret =
285             dn->transmit(dn, pkt);
286         if (ret < 0) {
287                 int count;
288
289                 count = cfctrl_cancel_req(&cfctrl->serv.layer,
290                                                 user_layer);
291                 if (count != 1) {
292                         pr_err("Could not remove request (%d)", count);
293                         return -ENODEV;
294                 }
295         }
296         return 0;
297 }
298
299 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
300                                 struct cflayer *client)
301 {
302         int ret;
303         struct cfctrl *cfctrl = container_obj(layer);
304         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
305         struct cflayer *dn = cfctrl->serv.layer.dn;
306
307         if (!pkt)
308                 return -ENOMEM;
309
310         if (!dn) {
311                 pr_debug("not able to send link-down request\n");
312                 return -ENODEV;
313         }
314
315         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
316         cfpkt_addbdy(pkt, channelid);
317         init_info(cfpkt_info(pkt), cfctrl);
318         ret =
319             dn->transmit(dn, pkt);
320 #ifndef CAIF_NO_LOOP
321         cfctrl->loop_linkused[channelid] = 0;
322 #endif
323         return ret;
324 }
325
326 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
327 {
328         struct cfctrl_request_info *p, *tmp;
329         struct cfctrl *ctrl = container_obj(layr);
330         int found = 0;
331         spin_lock_bh(&ctrl->info_list_lock);
332
333         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
334                 if (p->client_layer == adap_layer) {
335                         list_del(&p->list);
336                         kfree(p);
337                         found++;
338                 }
339         }
340
341         spin_unlock_bh(&ctrl->info_list_lock);
342         return found;
343 }
344
345 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
346 {
347         u8 cmdrsp;
348         u8 cmd;
349         int ret = -1;
350         u16 tmp16;
351         u8 len;
352         u8 param[255];
353         u8 linkid;
354         struct cfctrl *cfctrl = container_obj(layer);
355         struct cfctrl_request_info rsp, *req;
356
357
358         cfpkt_extr_head(pkt, &cmdrsp, 1);
359         cmd = cmdrsp & CFCTRL_CMD_MASK;
360         if (cmd != CFCTRL_CMD_LINK_ERR
361             && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
362                 && CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
363                 if (handle_loop(cfctrl, cmd, pkt) != 0)
364                         cmdrsp |= CFCTRL_ERR_BIT;
365         }
366
367         switch (cmd) {
368         case CFCTRL_CMD_LINK_SETUP:
369                 {
370                         enum cfctrl_srv serv;
371                         enum cfctrl_srv servtype;
372                         u8 endpoint;
373                         u8 physlinkid;
374                         u8 prio;
375                         u8 tmp;
376                         u32 tmp32;
377                         u8 *cp;
378                         int i;
379                         struct cfctrl_link_param linkparam;
380                         memset(&linkparam, 0, sizeof(linkparam));
381
382                         cfpkt_extr_head(pkt, &tmp, 1);
383
384                         serv = tmp & CFCTRL_SRV_MASK;
385                         linkparam.linktype = serv;
386
387                         servtype = tmp >> 4;
388                         linkparam.chtype = servtype;
389
390                         cfpkt_extr_head(pkt, &tmp, 1);
391                         physlinkid = tmp & 0x07;
392                         prio = tmp >> 3;
393
394                         linkparam.priority = prio;
395                         linkparam.phyid = physlinkid;
396                         cfpkt_extr_head(pkt, &endpoint, 1);
397                         linkparam.endpoint = endpoint & 0x03;
398
399                         switch (serv) {
400                         case CFCTRL_SRV_VEI:
401                         case CFCTRL_SRV_DBG:
402                                 if (CFCTRL_ERR_BIT & cmdrsp)
403                                         break;
404                                 /* Link ID */
405                                 cfpkt_extr_head(pkt, &linkid, 1);
406                                 break;
407                         case CFCTRL_SRV_VIDEO:
408                                 cfpkt_extr_head(pkt, &tmp, 1);
409                                 linkparam.u.video.connid = tmp;
410                                 if (CFCTRL_ERR_BIT & cmdrsp)
411                                         break;
412                                 /* Link ID */
413                                 cfpkt_extr_head(pkt, &linkid, 1);
414                                 break;
415
416                         case CFCTRL_SRV_DATAGRAM:
417                                 cfpkt_extr_head(pkt, &tmp32, 4);
418                                 linkparam.u.datagram.connid =
419                                     le32_to_cpu(tmp32);
420                                 if (CFCTRL_ERR_BIT & cmdrsp)
421                                         break;
422                                 /* Link ID */
423                                 cfpkt_extr_head(pkt, &linkid, 1);
424                                 break;
425                         case CFCTRL_SRV_RFM:
426                                 /* Construct a frame, convert
427                                  * DatagramConnectionID
428                                  * to network format long and copy it out...
429                                  */
430                                 cfpkt_extr_head(pkt, &tmp32, 4);
431                                 linkparam.u.rfm.connid =
432                                   le32_to_cpu(tmp32);
433                                 cp = (u8 *) linkparam.u.rfm.volume;
434                                 for (cfpkt_extr_head(pkt, &tmp, 1);
435                                      cfpkt_more(pkt) && tmp != '\0';
436                                      cfpkt_extr_head(pkt, &tmp, 1))
437                                         *cp++ = tmp;
438                                 *cp = '\0';
439
440                                 if (CFCTRL_ERR_BIT & cmdrsp)
441                                         break;
442                                 /* Link ID */
443                                 cfpkt_extr_head(pkt, &linkid, 1);
444
445                                 break;
446                         case CFCTRL_SRV_UTIL:
447                                 /* Construct a frame, convert
448                                  * DatagramConnectionID
449                                  * to network format long and copy it out...
450                                  */
451                                 /* Fifosize KB */
452                                 cfpkt_extr_head(pkt, &tmp16, 2);
453                                 linkparam.u.utility.fifosize_kb =
454                                     le16_to_cpu(tmp16);
455                                 /* Fifosize bufs */
456                                 cfpkt_extr_head(pkt, &tmp16, 2);
457                                 linkparam.u.utility.fifosize_bufs =
458                                     le16_to_cpu(tmp16);
459                                 /* name */
460                                 cp = (u8 *) linkparam.u.utility.name;
461                                 caif_assert(sizeof(linkparam.u.utility.name)
462                                              >= UTILITY_NAME_LENGTH);
463                                 for (i = 0;
464                                      i < UTILITY_NAME_LENGTH
465                                      && cfpkt_more(pkt); i++) {
466                                         cfpkt_extr_head(pkt, &tmp, 1);
467                                         *cp++ = tmp;
468                                 }
469                                 /* Length */
470                                 cfpkt_extr_head(pkt, &len, 1);
471                                 linkparam.u.utility.paramlen = len;
472                                 /* Param Data */
473                                 cp = linkparam.u.utility.params;
474                                 while (cfpkt_more(pkt) && len--) {
475                                         cfpkt_extr_head(pkt, &tmp, 1);
476                                         *cp++ = tmp;
477                                 }
478                                 if (CFCTRL_ERR_BIT & cmdrsp)
479                                         break;
480                                 /* Link ID */
481                                 cfpkt_extr_head(pkt, &linkid, 1);
482                                 /* Length */
483                                 cfpkt_extr_head(pkt, &len, 1);
484                                 /* Param Data */
485                                 cfpkt_extr_head(pkt, &param, len);
486                                 break;
487                         default:
488                                 pr_warn("Request setup, invalid type (%d)\n",
489                                         serv);
490                                 goto error;
491                         }
492
493                         rsp.cmd = cmd;
494                         rsp.param = linkparam;
495                         spin_lock_bh(&cfctrl->info_list_lock);
496                         req = cfctrl_remove_req(cfctrl, &rsp);
497
498                         if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
499                                 cfpkt_erroneous(pkt)) {
500                                 pr_err("Invalid O/E bit or parse error "
501                                                 "on CAIF control channel\n");
502                                 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
503                                                        0,
504                                                        req ? req->client_layer
505                                                        : NULL);
506                         } else {
507                                 cfctrl->res.linksetup_rsp(cfctrl->serv.
508                                                           layer.up, linkid,
509                                                           serv, physlinkid,
510                                                           req ? req->
511                                                           client_layer : NULL);
512                         }
513
514                         if (req != NULL)
515                                 kfree(req);
516
517                         spin_unlock_bh(&cfctrl->info_list_lock);
518                 }
519                 break;
520         case CFCTRL_CMD_LINK_DESTROY:
521                 cfpkt_extr_head(pkt, &linkid, 1);
522                 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
523                 break;
524         case CFCTRL_CMD_LINK_ERR:
525                 pr_err("Frame Error Indication received\n");
526                 cfctrl->res.linkerror_ind();
527                 break;
528         case CFCTRL_CMD_ENUM:
529                 cfctrl->res.enum_rsp();
530                 break;
531         case CFCTRL_CMD_SLEEP:
532                 cfctrl->res.sleep_rsp();
533                 break;
534         case CFCTRL_CMD_WAKE:
535                 cfctrl->res.wake_rsp();
536                 break;
537         case CFCTRL_CMD_LINK_RECONF:
538                 cfctrl->res.restart_rsp();
539                 break;
540         case CFCTRL_CMD_RADIO_SET:
541                 cfctrl->res.radioset_rsp();
542                 break;
543         default:
544                 pr_err("Unrecognized Control Frame\n");
545                 goto error;
546                 break;
547         }
548         ret = 0;
549 error:
550         cfpkt_destroy(pkt);
551         return ret;
552 }
553
554 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
555                         int phyid)
556 {
557         struct cfctrl *this = container_obj(layr);
558         switch (ctrl) {
559         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
560         case CAIF_CTRLCMD_FLOW_OFF_IND:
561                 spin_lock_bh(&this->info_list_lock);
562                 if (!list_empty(&this->list))
563                         pr_debug("Received flow off in control layer\n");
564                 spin_unlock_bh(&this->info_list_lock);
565                 break;
566         case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
567                 struct cfctrl_request_info *p, *tmp;
568
569                 /* Find all connect request and report failure */
570                 spin_lock_bh(&this->info_list_lock);
571                 list_for_each_entry_safe(p, tmp, &this->list, list) {
572                         if (p->param.phyid == phyid) {
573                                 list_del(&p->list);
574                                 p->client_layer->ctrlcmd(p->client_layer,
575                                                 CAIF_CTRLCMD_INIT_FAIL_RSP,
576                                                 phyid);
577                                 kfree(p);
578                         }
579                 }
580                 spin_unlock_bh(&this->info_list_lock);
581                 break;
582         }
583         default:
584                 break;
585         }
586 }
587
588 #ifndef CAIF_NO_LOOP
589 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
590 {
591         static int last_linkid;
592         static int dec;
593         u8 linkid, linktype, tmp;
594         switch (cmd) {
595         case CFCTRL_CMD_LINK_SETUP:
596                 spin_lock_bh(&ctrl->loop_linkid_lock);
597                 if (!dec) {
598                         for (linkid = last_linkid + 1; linkid < 254; linkid++)
599                                 if (!ctrl->loop_linkused[linkid])
600                                         goto found;
601                 }
602                 dec = 1;
603                 for (linkid = last_linkid - 1; linkid > 1; linkid--)
604                         if (!ctrl->loop_linkused[linkid])
605                                 goto found;
606                 spin_unlock_bh(&ctrl->loop_linkid_lock);
607                 return -1;
608 found:
609                 if (linkid < 10)
610                         dec = 0;
611
612                 if (!ctrl->loop_linkused[linkid])
613                         ctrl->loop_linkused[linkid] = 1;
614
615                 last_linkid = linkid;
616
617                 cfpkt_add_trail(pkt, &linkid, 1);
618                 spin_unlock_bh(&ctrl->loop_linkid_lock);
619                 cfpkt_peek_head(pkt, &linktype, 1);
620                 if (linktype ==  CFCTRL_SRV_UTIL) {
621                         tmp = 0x01;
622                         cfpkt_add_trail(pkt, &tmp, 1);
623                         cfpkt_add_trail(pkt, &tmp, 1);
624                 }
625                 break;
626
627         case CFCTRL_CMD_LINK_DESTROY:
628                 spin_lock_bh(&ctrl->loop_linkid_lock);
629                 cfpkt_peek_head(pkt, &linkid, 1);
630                 ctrl->loop_linkused[linkid] = 0;
631                 spin_unlock_bh(&ctrl->loop_linkid_lock);
632                 break;
633         default:
634                 break;
635         }
636         return 0;
637 }
638 #endif