1 /* 2 * oxfw_stream.c - a part of driver for OXFW970/971 based devices 3 * 4 * Copyright (c) 2014 Takashi Sakamoto 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include "oxfw.h" 10 #include <linux/delay.h> 11 12 #define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512 13 #define CALLBACK_TIMEOUT 200 14 15 /* 16 * According to datasheet of Oxford Semiconductor: 17 * OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O 18 * OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O 19 */ 20 static const unsigned int oxfw_rate_table[] = { 21 [0] = 32000, 22 [1] = 44100, 23 [2] = 48000, 24 [3] = 88200, 25 [4] = 96000, 26 [5] = 192000, 27 }; 28 29 /* 30 * See Table 5.7 – Sampling frequency for Multi-bit Audio 31 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 32 */ 33 static const unsigned int avc_stream_rate_table[] = { 34 [0] = 0x02, 35 [1] = 0x03, 36 [2] = 0x04, 37 [3] = 0x0a, 38 [4] = 0x05, 39 [5] = 0x07, 40 }; 41 42 static int set_rate(struct snd_oxfw *oxfw, unsigned int rate) 43 { 44 int err; 45 46 err = avc_general_set_sig_fmt(oxfw->unit, rate, 47 AVC_GENERAL_PLUG_DIR_IN, 0); 48 if (err < 0) 49 goto end; 50 51 if (oxfw->has_output) 52 err = avc_general_set_sig_fmt(oxfw->unit, rate, 53 AVC_GENERAL_PLUG_DIR_OUT, 0); 54 end: 55 return err; 56 } 57 58 static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s, 59 unsigned int rate, unsigned int pcm_channels) 60 { 61 u8 **formats; 62 struct snd_oxfw_stream_formation formation; 63 enum avc_general_plug_dir dir; 64 unsigned int len; 65 int i, err; 66 67 if (s == &oxfw->tx_stream) { 68 formats = oxfw->tx_stream_formats; 69 dir = AVC_GENERAL_PLUG_DIR_OUT; 70 } else { 71 formats = oxfw->rx_stream_formats; 72 dir = AVC_GENERAL_PLUG_DIR_IN; 73 } 74 75 /* Seek stream format for requirements. */ 76 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 77 err = snd_oxfw_stream_parse_format(formats[i], &formation); 78 if (err < 0) 79 return err; 80 81 if ((formation.rate == rate) && (formation.pcm == pcm_channels)) 82 break; 83 } 84 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 85 return -EINVAL; 86 87 /* If assumed, just change rate. */ 88 if (oxfw->assumed) 89 return set_rate(oxfw, rate); 90 91 /* Calculate format length. */ 92 len = 5 + formats[i][4] * 2; 93 94 err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len); 95 if (err < 0) 96 return err; 97 98 /* Some requests just after changing format causes freezing. */ 99 msleep(100); 100 101 return 0; 102 } 103 104 static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 105 { 106 u8 **formats; 107 enum avc_general_plug_dir dir; 108 struct cmp_connection *conn; 109 struct snd_oxfw_stream_formation formation; 110 int i; 111 int err; 112 113 if (stream == &oxfw->rx_stream) { 114 dir = AVC_GENERAL_PLUG_DIR_IN; 115 formats = oxfw->rx_stream_formats; 116 conn = &oxfw->in_conn; 117 } else { 118 dir = AVC_GENERAL_PLUG_DIR_OUT; 119 formats = oxfw->tx_stream_formats; 120 conn = &oxfw->out_conn; 121 } 122 123 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 124 if (err < 0) 125 return err; 126 127 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 128 struct snd_oxfw_stream_formation fmt; 129 130 if (formats[i] == NULL) 131 break; 132 133 err = snd_oxfw_stream_parse_format(formats[i], &fmt); 134 if (err < 0) 135 return err; 136 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm && 137 fmt.midi == formation.midi) 138 break; 139 } 140 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 141 return -EINVAL; 142 143 // The stream should have one pcm channels at least. 144 if (formation.pcm == 0) 145 return -EINVAL; 146 147 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm, 148 formation.midi * 8, false); 149 if (err < 0) 150 return err; 151 152 err = cmp_connection_establish(conn, 153 amdtp_stream_get_max_payload(stream)); 154 if (err < 0) 155 return err; 156 157 err = amdtp_stream_start(stream, conn->resources.channel, conn->speed); 158 if (err < 0) { 159 cmp_connection_break(conn); 160 return err; 161 } 162 163 // Wait first packet. 164 if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) { 165 amdtp_stream_stop(stream); 166 cmp_connection_break(conn); 167 return -ETIMEDOUT; 168 } 169 170 return 0; 171 } 172 173 static int check_connection_used_by_others(struct snd_oxfw *oxfw, 174 struct amdtp_stream *stream) 175 { 176 struct cmp_connection *conn; 177 bool used; 178 int err; 179 180 if (stream == &oxfw->tx_stream) 181 conn = &oxfw->out_conn; 182 else 183 conn = &oxfw->in_conn; 184 185 err = cmp_connection_check_used(conn, &used); 186 if ((err >= 0) && used && !amdtp_stream_running(stream)) { 187 dev_err(&oxfw->unit->device, 188 "Connection established by others: %cPCR[%d]\n", 189 (conn->direction == CMP_OUTPUT) ? 'o' : 'i', 190 conn->pcr_index); 191 err = -EBUSY; 192 } 193 194 return err; 195 } 196 197 static int init_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 198 { 199 struct cmp_connection *conn; 200 enum cmp_direction c_dir; 201 enum amdtp_stream_direction s_dir; 202 int err; 203 204 if (stream == &oxfw->tx_stream) { 205 conn = &oxfw->out_conn; 206 c_dir = CMP_OUTPUT; 207 s_dir = AMDTP_IN_STREAM; 208 } else { 209 conn = &oxfw->in_conn; 210 c_dir = CMP_INPUT; 211 s_dir = AMDTP_OUT_STREAM; 212 } 213 214 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0); 215 if (err < 0) 216 return err; 217 218 err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING); 219 if (err < 0) { 220 cmp_connection_destroy(conn); 221 return err; 222 } 223 224 /* 225 * OXFW starts to transmit packets with non-zero dbc. 226 * OXFW postpone transferring packets till handling any asynchronous 227 * packets. As a result, next isochronous packet includes more data 228 * blocks than IEC 61883-6 defines. 229 */ 230 if (stream == &oxfw->tx_stream) { 231 oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD; 232 if (oxfw->wrong_dbs) 233 oxfw->tx_stream.flags |= CIP_WRONG_DBS; 234 } 235 236 return 0; 237 } 238 239 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw, 240 struct amdtp_stream *stream, 241 unsigned int rate, unsigned int pcm_channels) 242 { 243 struct snd_oxfw_stream_formation formation; 244 enum avc_general_plug_dir dir; 245 int err = 0; 246 247 if (oxfw->substreams_count == 0) 248 return -EIO; 249 250 // Considering JACK/FFADO streaming: 251 // TODO: This can be removed hwdep functionality becomes popular. 252 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream); 253 if (err < 0) 254 return err; 255 if (oxfw->has_output) { 256 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream); 257 if (err < 0) 258 return err; 259 } 260 261 if (stream == &oxfw->tx_stream) 262 dir = AVC_GENERAL_PLUG_DIR_OUT; 263 else 264 dir = AVC_GENERAL_PLUG_DIR_IN; 265 266 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 267 if (err < 0) 268 return err; 269 if (rate == 0) 270 rate = formation.rate; 271 if (pcm_channels == 0) 272 pcm_channels = formation.pcm; 273 274 if (formation.rate != rate || formation.pcm != pcm_channels || 275 amdtp_streaming_error(&oxfw->rx_stream) || 276 amdtp_streaming_error(&oxfw->tx_stream)) { 277 amdtp_stream_stop(&oxfw->rx_stream); 278 cmp_connection_break(&oxfw->in_conn); 279 280 if (oxfw->has_output) { 281 amdtp_stream_stop(&oxfw->tx_stream); 282 cmp_connection_break(&oxfw->out_conn); 283 } 284 285 err = set_stream_format(oxfw, stream, rate, pcm_channels); 286 if (err < 0) { 287 dev_err(&oxfw->unit->device, 288 "fail to set stream format: %d\n", err); 289 return err; 290 } 291 } 292 293 if (!amdtp_stream_running(&oxfw->rx_stream)) { 294 err = start_stream(oxfw, &oxfw->rx_stream); 295 if (err < 0) { 296 dev_err(&oxfw->unit->device, 297 "fail to start rx stream: %d\n", err); 298 goto error; 299 } 300 } 301 302 if (oxfw->has_output) { 303 if (!amdtp_stream_running(&oxfw->tx_stream)) { 304 err = start_stream(oxfw, &oxfw->tx_stream); 305 if (err < 0) { 306 dev_err(&oxfw->unit->device, 307 "fail to start tx stream: %d\n", err); 308 goto error; 309 } 310 } 311 } 312 313 return 0; 314 error: 315 amdtp_stream_stop(&oxfw->rx_stream); 316 cmp_connection_break(&oxfw->in_conn); 317 if (oxfw->has_output) { 318 amdtp_stream_stop(&oxfw->tx_stream); 319 cmp_connection_break(&oxfw->out_conn); 320 } 321 return err; 322 } 323 324 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw) 325 { 326 if (oxfw->substreams_count == 0) { 327 amdtp_stream_stop(&oxfw->rx_stream); 328 cmp_connection_break(&oxfw->in_conn); 329 330 if (oxfw->has_output) { 331 amdtp_stream_stop(&oxfw->tx_stream); 332 cmp_connection_break(&oxfw->out_conn); 333 } 334 } 335 } 336 337 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 338 { 339 struct cmp_connection *conn; 340 341 if (stream == &oxfw->tx_stream) 342 conn = &oxfw->out_conn; 343 else 344 conn = &oxfw->in_conn; 345 346 amdtp_stream_destroy(stream); 347 cmp_connection_destroy(conn); 348 } 349 350 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw) 351 { 352 int err; 353 354 err = init_stream(oxfw, &oxfw->rx_stream); 355 if (err < 0) 356 return err; 357 358 if (oxfw->has_output) { 359 err = init_stream(oxfw, &oxfw->tx_stream); 360 if (err < 0) { 361 destroy_stream(oxfw, &oxfw->rx_stream); 362 return err; 363 } 364 } 365 366 return 0; 367 } 368 369 // This function should be called before starting the stream or after stopping 370 // the streams. 371 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw) 372 { 373 destroy_stream(oxfw, &oxfw->rx_stream); 374 375 if (oxfw->has_output) 376 destroy_stream(oxfw, &oxfw->tx_stream); 377 } 378 379 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw) 380 { 381 amdtp_stream_stop(&oxfw->rx_stream); 382 cmp_connection_break(&oxfw->in_conn); 383 384 amdtp_stream_pcm_abort(&oxfw->rx_stream); 385 386 if (oxfw->has_output) { 387 amdtp_stream_stop(&oxfw->tx_stream); 388 cmp_connection_break(&oxfw->out_conn); 389 390 amdtp_stream_pcm_abort(&oxfw->tx_stream); 391 } 392 } 393 394 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw, 395 enum avc_general_plug_dir dir, 396 struct snd_oxfw_stream_formation *formation) 397 { 398 u8 *format; 399 unsigned int len; 400 int err; 401 402 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 403 format = kmalloc(len, GFP_KERNEL); 404 if (format == NULL) 405 return -ENOMEM; 406 407 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len); 408 if (err < 0) 409 goto end; 410 if (len < 3) { 411 err = -EIO; 412 goto end; 413 } 414 415 err = snd_oxfw_stream_parse_format(format, formation); 416 end: 417 kfree(format); 418 return err; 419 } 420 421 /* 422 * See Table 6.16 - AM824 Stream Format 423 * Figure 6.19 - format_information field for AM824 Compound 424 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 425 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005 426 */ 427 int snd_oxfw_stream_parse_format(u8 *format, 428 struct snd_oxfw_stream_formation *formation) 429 { 430 unsigned int i, e, channels, type; 431 432 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation)); 433 434 /* 435 * this module can support a hierarchy combination that: 436 * Root: Audio and Music (0x90) 437 * Level 1: AM824 Compound (0x40) 438 */ 439 if ((format[0] != 0x90) || (format[1] != 0x40)) 440 return -ENOSYS; 441 442 /* check the sampling rate */ 443 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) { 444 if (format[2] == avc_stream_rate_table[i]) 445 break; 446 } 447 if (i == ARRAY_SIZE(avc_stream_rate_table)) 448 return -ENOSYS; 449 450 formation->rate = oxfw_rate_table[i]; 451 452 for (e = 0; e < format[4]; e++) { 453 channels = format[5 + e * 2]; 454 type = format[6 + e * 2]; 455 456 switch (type) { 457 /* IEC 60958 Conformant, currently handled as MBLA */ 458 case 0x00: 459 /* Multi Bit Linear Audio (Raw) */ 460 case 0x06: 461 formation->pcm += channels; 462 break; 463 /* MIDI Conformant */ 464 case 0x0d: 465 formation->midi = channels; 466 break; 467 /* IEC 61937-3 to 7 */ 468 case 0x01: 469 case 0x02: 470 case 0x03: 471 case 0x04: 472 case 0x05: 473 /* Multi Bit Linear Audio */ 474 case 0x07: /* DVD-Audio */ 475 case 0x0c: /* High Precision */ 476 /* One Bit Audio */ 477 case 0x08: /* (Plain) Raw */ 478 case 0x09: /* (Plain) SACD */ 479 case 0x0a: /* (Encoded) Raw */ 480 case 0x0b: /* (Encoded) SACD */ 481 /* SMPTE Time-Code conformant */ 482 case 0x0e: 483 /* Sample Count */ 484 case 0x0f: 485 /* Anciliary Data */ 486 case 0x10: 487 /* Synchronization Stream (Stereo Raw audio) */ 488 case 0x40: 489 /* Don't care */ 490 case 0xff: 491 default: 492 return -ENOSYS; /* not supported */ 493 } 494 } 495 496 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM || 497 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI) 498 return -ENOSYS; 499 500 return 0; 501 } 502 503 static int 504 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir, 505 unsigned int pid, u8 *buf, unsigned int *len, 506 u8 **formats) 507 { 508 struct snd_oxfw_stream_formation formation; 509 unsigned int i, eid; 510 int err; 511 512 /* get format at current sampling rate */ 513 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len); 514 if (err < 0) { 515 dev_err(&oxfw->unit->device, 516 "fail to get current stream format for isoc %s plug %d:%d\n", 517 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 518 pid, err); 519 goto end; 520 } 521 522 /* parse and set stream format */ 523 eid = 0; 524 err = snd_oxfw_stream_parse_format(buf, &formation); 525 if (err < 0) 526 goto end; 527 528 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 529 GFP_KERNEL); 530 if (!formats[eid]) { 531 err = -ENOMEM; 532 goto end; 533 } 534 535 /* apply the format for each available sampling rate */ 536 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) { 537 if (formation.rate == oxfw_rate_table[i]) 538 continue; 539 540 err = avc_general_inquiry_sig_fmt(oxfw->unit, 541 oxfw_rate_table[i], 542 dir, pid); 543 if (err < 0) 544 continue; 545 546 eid++; 547 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 548 GFP_KERNEL); 549 if (formats[eid] == NULL) { 550 err = -ENOMEM; 551 goto end; 552 } 553 formats[eid][2] = avc_stream_rate_table[i]; 554 } 555 556 err = 0; 557 oxfw->assumed = true; 558 end: 559 return err; 560 } 561 562 static int fill_stream_formats(struct snd_oxfw *oxfw, 563 enum avc_general_plug_dir dir, 564 unsigned short pid) 565 { 566 u8 *buf, **formats; 567 unsigned int len, eid = 0; 568 struct snd_oxfw_stream_formation dummy; 569 int err; 570 571 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL); 572 if (buf == NULL) 573 return -ENOMEM; 574 575 if (dir == AVC_GENERAL_PLUG_DIR_OUT) 576 formats = oxfw->tx_stream_formats; 577 else 578 formats = oxfw->rx_stream_formats; 579 580 /* get first entry */ 581 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 582 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0); 583 if (err == -ENOSYS) { 584 /* LIST subfunction is not implemented */ 585 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 586 err = assume_stream_formats(oxfw, dir, pid, buf, &len, 587 formats); 588 goto end; 589 } else if (err < 0) { 590 dev_err(&oxfw->unit->device, 591 "fail to get stream format %d for isoc %s plug %d:%d\n", 592 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 593 pid, err); 594 goto end; 595 } 596 597 /* LIST subfunction is implemented */ 598 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) { 599 /* The format is too short. */ 600 if (len < 3) { 601 err = -EIO; 602 break; 603 } 604 605 /* parse and set stream format */ 606 err = snd_oxfw_stream_parse_format(buf, &dummy); 607 if (err < 0) 608 break; 609 610 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len, 611 GFP_KERNEL); 612 if (!formats[eid]) { 613 err = -ENOMEM; 614 break; 615 } 616 617 /* get next entry */ 618 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 619 err = avc_stream_get_format_list(oxfw->unit, dir, 0, 620 buf, &len, ++eid); 621 /* No entries remained. */ 622 if (err == -EINVAL) { 623 err = 0; 624 break; 625 } else if (err < 0) { 626 dev_err(&oxfw->unit->device, 627 "fail to get stream format %d for isoc %s plug %d:%d\n", 628 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : 629 "out", 630 pid, err); 631 break; 632 } 633 } 634 end: 635 kfree(buf); 636 return err; 637 } 638 639 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw) 640 { 641 u8 plugs[AVC_PLUG_INFO_BUF_BYTES]; 642 struct snd_oxfw_stream_formation formation; 643 u8 *format; 644 unsigned int i; 645 int err; 646 647 /* the number of plugs for isoc in/out, ext in/out */ 648 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs); 649 if (err < 0) { 650 dev_err(&oxfw->unit->device, 651 "fail to get info for isoc/external in/out plugs: %d\n", 652 err); 653 goto end; 654 } else if ((plugs[0] == 0) && (plugs[1] == 0)) { 655 err = -ENOSYS; 656 goto end; 657 } 658 659 /* use oPCR[0] if exists */ 660 if (plugs[1] > 0) { 661 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0); 662 if (err < 0) 663 goto end; 664 665 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 666 format = oxfw->tx_stream_formats[i]; 667 if (format == NULL) 668 continue; 669 err = snd_oxfw_stream_parse_format(format, &formation); 670 if (err < 0) 671 continue; 672 673 /* Add one MIDI port. */ 674 if (formation.midi > 0) 675 oxfw->midi_input_ports = 1; 676 } 677 678 oxfw->has_output = true; 679 } 680 681 /* use iPCR[0] if exists */ 682 if (plugs[0] > 0) { 683 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0); 684 if (err < 0) 685 goto end; 686 687 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 688 format = oxfw->rx_stream_formats[i]; 689 if (format == NULL) 690 continue; 691 err = snd_oxfw_stream_parse_format(format, &formation); 692 if (err < 0) 693 continue; 694 695 /* Add one MIDI port. */ 696 if (formation.midi > 0) 697 oxfw->midi_output_ports = 1; 698 } 699 } 700 end: 701 return err; 702 } 703 704 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw) 705 { 706 oxfw->dev_lock_changed = true; 707 wake_up(&oxfw->hwdep_wait); 708 } 709 710 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw) 711 { 712 int err; 713 714 spin_lock_irq(&oxfw->lock); 715 716 /* user land lock this */ 717 if (oxfw->dev_lock_count < 0) { 718 err = -EBUSY; 719 goto end; 720 } 721 722 /* this is the first time */ 723 if (oxfw->dev_lock_count++ == 0) 724 snd_oxfw_stream_lock_changed(oxfw); 725 err = 0; 726 end: 727 spin_unlock_irq(&oxfw->lock); 728 return err; 729 } 730 731 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw) 732 { 733 spin_lock_irq(&oxfw->lock); 734 735 if (WARN_ON(oxfw->dev_lock_count <= 0)) 736 goto end; 737 if (--oxfw->dev_lock_count == 0) 738 snd_oxfw_stream_lock_changed(oxfw); 739 end: 740 spin_unlock_irq(&oxfw->lock); 741 } 742