1/* 2 3 Broadcom B43legacy wireless driver 4 5 PIO Transmission 6 7 Copyright (c) 2005 Michael Buesch <m@bues.ch> 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; see the file COPYING. If not, write to 21 the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, 22 Boston, MA 02110-1301, USA. 23 24*/ 25 26#include "b43legacy.h" 27#include "pio.h" 28#include "main.h" 29#include "xmit.h" 30 31#include <linux/delay.h> 32#include <linux/slab.h> 33 34 35static void tx_start(struct b43legacy_pioqueue *queue) 36{ 37 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 38 B43legacy_PIO_TXCTL_INIT); 39} 40 41static void tx_octet(struct b43legacy_pioqueue *queue, 42 u8 octet) 43{ 44 if (queue->need_workarounds) { 45 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); 46 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 47 B43legacy_PIO_TXCTL_WRITELO); 48 } else { 49 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 50 B43legacy_PIO_TXCTL_WRITELO); 51 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); 52 } 53} 54 55static u16 tx_get_next_word(const u8 *txhdr, 56 const u8 *packet, 57 size_t txhdr_size, 58 unsigned int *pos) 59{ 60 const u8 *source; 61 unsigned int i = *pos; 62 u16 ret; 63 64 if (i < txhdr_size) 65 source = txhdr; 66 else { 67 source = packet; 68 i -= txhdr_size; 69 } 70 ret = le16_to_cpu(*((__le16 *)(source + i))); 71 *pos += 2; 72 73 return ret; 74} 75 76static void tx_data(struct b43legacy_pioqueue *queue, 77 u8 *txhdr, 78 const u8 *packet, 79 unsigned int octets) 80{ 81 u16 data; 82 unsigned int i = 0; 83 84 if (queue->need_workarounds) { 85 data = tx_get_next_word(txhdr, packet, 86 sizeof(struct b43legacy_txhdr_fw3), &i); 87 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); 88 } 89 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 90 B43legacy_PIO_TXCTL_WRITELO | 91 B43legacy_PIO_TXCTL_WRITEHI); 92 while (i < octets - 1) { 93 data = tx_get_next_word(txhdr, packet, 94 sizeof(struct b43legacy_txhdr_fw3), &i); 95 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); 96 } 97 if (octets % 2) 98 tx_octet(queue, packet[octets - 99 sizeof(struct b43legacy_txhdr_fw3) - 1]); 100} 101 102static void tx_complete(struct b43legacy_pioqueue *queue, 103 struct sk_buff *skb) 104{ 105 if (queue->need_workarounds) { 106 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, 107 skb->data[skb->len - 1]); 108 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 109 B43legacy_PIO_TXCTL_WRITELO | 110 B43legacy_PIO_TXCTL_COMPLETE); 111 } else 112 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 113 B43legacy_PIO_TXCTL_COMPLETE); 114} 115 116static u16 generate_cookie(struct b43legacy_pioqueue *queue, 117 struct b43legacy_pio_txpacket *packet) 118{ 119 u16 cookie = 0x0000; 120 int packetindex; 121 122 /* We use the upper 4 bits for the PIO 123 * controller ID and the lower 12 bits 124 * for the packet index (in the cache). 125 */ 126 switch (queue->mmio_base) { 127 case B43legacy_MMIO_PIO1_BASE: 128 break; 129 case B43legacy_MMIO_PIO2_BASE: 130 cookie = 0x1000; 131 break; 132 case B43legacy_MMIO_PIO3_BASE: 133 cookie = 0x2000; 134 break; 135 case B43legacy_MMIO_PIO4_BASE: 136 cookie = 0x3000; 137 break; 138 default: 139 B43legacy_WARN_ON(1); 140 } 141 packetindex = pio_txpacket_getindex(packet); 142 B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000)); 143 cookie |= (u16)packetindex; 144 145 return cookie; 146} 147 148static 149struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev, 150 u16 cookie, 151 struct b43legacy_pio_txpacket **packet) 152{ 153 struct b43legacy_pio *pio = &dev->pio; 154 struct b43legacy_pioqueue *queue = NULL; 155 int packetindex; 156 157 switch (cookie & 0xF000) { 158 case 0x0000: 159 queue = pio->queue0; 160 break; 161 case 0x1000: 162 queue = pio->queue1; 163 break; 164 case 0x2000: 165 queue = pio->queue2; 166 break; 167 case 0x3000: 168 queue = pio->queue3; 169 break; 170 default: 171 B43legacy_WARN_ON(1); 172 } 173 packetindex = (cookie & 0x0FFF); 174 B43legacy_WARN_ON(!(packetindex >= 0 && packetindex 175 < B43legacy_PIO_MAXTXPACKETS)); 176 *packet = &(queue->tx_packets_cache[packetindex]); 177 178 return queue; 179} 180 181union txhdr_union { 182 struct b43legacy_txhdr_fw3 txhdr_fw3; 183}; 184 185static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue, 186 struct sk_buff *skb, 187 struct b43legacy_pio_txpacket *packet, 188 size_t txhdr_size) 189{ 190 union txhdr_union txhdr_data; 191 u8 *txhdr = NULL; 192 unsigned int octets; 193 int err; 194 195 txhdr = (u8 *)(&txhdr_data.txhdr_fw3); 196 197 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); 198 err = b43legacy_generate_txhdr(queue->dev, 199 txhdr, skb->data, skb->len, 200 IEEE80211_SKB_CB(skb), 201 generate_cookie(queue, packet)); 202 if (err) 203 return err; 204 205 tx_start(queue); 206 octets = skb->len + txhdr_size; 207 if (queue->need_workarounds) 208 octets--; 209 tx_data(queue, txhdr, (u8 *)skb->data, octets); 210 tx_complete(queue, skb); 211 212 return 0; 213} 214 215static void free_txpacket(struct b43legacy_pio_txpacket *packet, 216 int irq_context) 217{ 218 struct b43legacy_pioqueue *queue = packet->queue; 219 220 if (packet->skb) { 221 if (irq_context) 222 dev_kfree_skb_irq(packet->skb); 223 else 224 dev_kfree_skb(packet->skb); 225 } 226 list_move(&packet->list, &queue->txfree); 227 queue->nr_txfree++; 228} 229 230static int pio_tx_packet(struct b43legacy_pio_txpacket *packet) 231{ 232 struct b43legacy_pioqueue *queue = packet->queue; 233 struct sk_buff *skb = packet->skb; 234 u16 octets; 235 int err; 236 237 octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3); 238 if (queue->tx_devq_size < octets) { 239 b43legacywarn(queue->dev->wl, "PIO queue too small. " 240 "Dropping packet.\n"); 241 /* Drop it silently (return success) */ 242 free_txpacket(packet, 1); 243 return 0; 244 } 245 B43legacy_WARN_ON(queue->tx_devq_packets > 246 B43legacy_PIO_MAXTXDEVQPACKETS); 247 B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size); 248 /* Check if there is sufficient free space on the device 249 * TX queue. If not, return and let the TX tasklet 250 * retry later. 251 */ 252 if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS) 253 return -EBUSY; 254 if (queue->tx_devq_used + octets > queue->tx_devq_size) 255 return -EBUSY; 256 /* Now poke the device. */ 257 err = pio_tx_write_fragment(queue, skb, packet, 258 sizeof(struct b43legacy_txhdr_fw3)); 259 if (unlikely(err == -ENOKEY)) { 260 /* Drop this packet, as we don't have the encryption key 261 * anymore and must not transmit it unencrypted. */ 262 free_txpacket(packet, 1); 263 return 0; 264 } 265 266 /* Account for the packet size. 267 * (We must not overflow the device TX queue) 268 */ 269 queue->tx_devq_packets++; 270 queue->tx_devq_used += octets; 271 272 /* Transmission started, everything ok, move the 273 * packet to the txrunning list. 274 */ 275 list_move_tail(&packet->list, &queue->txrunning); 276 277 return 0; 278} 279 280static void tx_tasklet(unsigned long d) 281{ 282 struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d; 283 struct b43legacy_wldev *dev = queue->dev; 284 unsigned long flags; 285 struct b43legacy_pio_txpacket *packet, *tmp_packet; 286 int err; 287 u16 txctl; 288 289 spin_lock_irqsave(&dev->wl->irq_lock, flags); 290 if (queue->tx_frozen) 291 goto out_unlock; 292 txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL); 293 if (txctl & B43legacy_PIO_TXCTL_SUSPEND) 294 goto out_unlock; 295 296 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) { 297 /* Try to transmit the packet. This can fail, if 298 * the device queue is full. In case of failure, the 299 * packet is left in the txqueue. 300 * If transmission succeed, the packet is moved to txrunning. 301 * If it is impossible to transmit the packet, it 302 * is dropped. 303 */ 304 err = pio_tx_packet(packet); 305 if (err) 306 break; 307 } 308out_unlock: 309 spin_unlock_irqrestore(&dev->wl->irq_lock, flags); 310} 311 312static void setup_txqueues(struct b43legacy_pioqueue *queue) 313{ 314 struct b43legacy_pio_txpacket *packet; 315 int i; 316 317 queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS; 318 for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) { 319 packet = &(queue->tx_packets_cache[i]); 320 321 packet->queue = queue; 322 INIT_LIST_HEAD(&packet->list); 323 324 list_add(&packet->list, &queue->txfree); 325 } 326} 327 328static 329struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev, 330 u16 pio_mmio_base) 331{ 332 struct b43legacy_pioqueue *queue; 333 u32 value; 334 u16 qsize; 335 336 queue = kzalloc(sizeof(*queue), GFP_KERNEL); 337 if (!queue) 338 goto out; 339 340 queue->dev = dev; 341 queue->mmio_base = pio_mmio_base; 342 queue->need_workarounds = (dev->dev->id.revision < 3); 343 344 INIT_LIST_HEAD(&queue->txfree); 345 INIT_LIST_HEAD(&queue->txqueue); 346 INIT_LIST_HEAD(&queue->txrunning); 347 tasklet_init(&queue->txtask, tx_tasklet, 348 (unsigned long)queue); 349 350 value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL); 351 value &= ~B43legacy_MACCTL_BE; 352 b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value); 353 354 qsize = b43legacy_read16(dev, queue->mmio_base 355 + B43legacy_PIO_TXQBUFSIZE); 356 if (qsize == 0) { 357 b43legacyerr(dev->wl, "This card does not support PIO " 358 "operation mode. Please use DMA mode " 359 "(module parameter pio=0).\n"); 360 goto err_freequeue; 361 } 362 if (qsize <= B43legacy_PIO_TXQADJUST) { 363 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n", 364 qsize); 365 goto err_freequeue; 366 } 367 qsize -= B43legacy_PIO_TXQADJUST; 368 queue->tx_devq_size = qsize; 369 370 setup_txqueues(queue); 371 372out: 373 return queue; 374 375err_freequeue: 376 kfree(queue); 377 queue = NULL; 378 goto out; 379} 380 381static void cancel_transfers(struct b43legacy_pioqueue *queue) 382{ 383 struct b43legacy_pio_txpacket *packet, *tmp_packet; 384 385 tasklet_kill(&queue->txtask); 386 387 list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list) 388 free_txpacket(packet, 0); 389 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) 390 free_txpacket(packet, 0); 391} 392 393static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue) 394{ 395 if (!queue) 396 return; 397 398 cancel_transfers(queue); 399 kfree(queue); 400} 401 402void b43legacy_pio_free(struct b43legacy_wldev *dev) 403{ 404 struct b43legacy_pio *pio; 405 406 if (!b43legacy_using_pio(dev)) 407 return; 408 pio = &dev->pio; 409 410 b43legacy_destroy_pioqueue(pio->queue3); 411 pio->queue3 = NULL; 412 b43legacy_destroy_pioqueue(pio->queue2); 413 pio->queue2 = NULL; 414 b43legacy_destroy_pioqueue(pio->queue1); 415 pio->queue1 = NULL; 416 b43legacy_destroy_pioqueue(pio->queue0); 417 pio->queue0 = NULL; 418} 419 420int b43legacy_pio_init(struct b43legacy_wldev *dev) 421{ 422 struct b43legacy_pio *pio = &dev->pio; 423 struct b43legacy_pioqueue *queue; 424 int err = -ENOMEM; 425 426 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE); 427 if (!queue) 428 goto out; 429 pio->queue0 = queue; 430 431 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE); 432 if (!queue) 433 goto err_destroy0; 434 pio->queue1 = queue; 435 436 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE); 437 if (!queue) 438 goto err_destroy1; 439 pio->queue2 = queue; 440 441 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE); 442 if (!queue) 443 goto err_destroy2; 444 pio->queue3 = queue; 445 446 if (dev->dev->id.revision < 3) 447 dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND; 448 449 b43legacydbg(dev->wl, "PIO initialized\n"); 450 err = 0; 451out: 452 return err; 453 454err_destroy2: 455 b43legacy_destroy_pioqueue(pio->queue2); 456 pio->queue2 = NULL; 457err_destroy1: 458 b43legacy_destroy_pioqueue(pio->queue1); 459 pio->queue1 = NULL; 460err_destroy0: 461 b43legacy_destroy_pioqueue(pio->queue0); 462 pio->queue0 = NULL; 463 goto out; 464} 465 466int b43legacy_pio_tx(struct b43legacy_wldev *dev, 467 struct sk_buff *skb) 468{ 469 struct b43legacy_pioqueue *queue = dev->pio.queue1; 470 struct b43legacy_pio_txpacket *packet; 471 472 B43legacy_WARN_ON(queue->tx_suspended); 473 B43legacy_WARN_ON(list_empty(&queue->txfree)); 474 475 packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket, 476 list); 477 packet->skb = skb; 478 479 list_move_tail(&packet->list, &queue->txqueue); 480 queue->nr_txfree--; 481 B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS); 482 483 tasklet_schedule(&queue->txtask); 484 485 return 0; 486} 487 488void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, 489 const struct b43legacy_txstatus *status) 490{ 491 struct b43legacy_pioqueue *queue; 492 struct b43legacy_pio_txpacket *packet; 493 struct ieee80211_tx_info *info; 494 int retry_limit; 495 496 queue = parse_cookie(dev, status->cookie, &packet); 497 B43legacy_WARN_ON(!queue); 498 499 if (!packet->skb) 500 return; 501 502 queue->tx_devq_packets--; 503 queue->tx_devq_used -= (packet->skb->len + 504 sizeof(struct b43legacy_txhdr_fw3)); 505 506 info = IEEE80211_SKB_CB(packet->skb); 507 508 /* preserve the confiured retry limit before clearing the status 509 * The xmit function has overwritten the rc's value with the actual 510 * retry limit done by the hardware */ 511 retry_limit = info->status.rates[0].count; 512 ieee80211_tx_info_clear_status(info); 513 514 if (status->acked) 515 info->flags |= IEEE80211_TX_STAT_ACK; 516 517 if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { 518 /* 519 * If the short retries (RTS, not data frame) have exceeded 520 * the limit, the hw will not have tried the selected rate, 521 * but will have used the fallback rate instead. 522 * Don't let the rate control count attempts for the selected 523 * rate in this case, otherwise the statistics will be off. 524 */ 525 info->status.rates[0].count = 0; 526 info->status.rates[1].count = status->frame_count; 527 } else { 528 if (status->frame_count > retry_limit) { 529 info->status.rates[0].count = retry_limit; 530 info->status.rates[1].count = status->frame_count - 531 retry_limit; 532 533 } else { 534 info->status.rates[0].count = status->frame_count; 535 info->status.rates[1].idx = -1; 536 } 537 } 538 ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb); 539 packet->skb = NULL; 540 541 free_txpacket(packet, 1); 542 /* If there are packets on the txqueue, poke the tasklet 543 * to transmit them. 544 */ 545 if (!list_empty(&queue->txqueue)) 546 tasklet_schedule(&queue->txtask); 547} 548 549static void pio_rx_error(struct b43legacy_pioqueue *queue, 550 int clear_buffers, 551 const char *error) 552{ 553 int i; 554 555 b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error); 556 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, 557 B43legacy_PIO_RXCTL_READY); 558 if (clear_buffers) { 559 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE); 560 for (i = 0; i < 15; i++) { 561 /* Dummy read. */ 562 b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); 563 } 564 } 565} 566 567void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) 568{ 569 __le16 preamble[21] = { 0 }; 570 struct b43legacy_rxhdr_fw3 *rxhdr; 571 u16 tmp; 572 u16 len; 573 u16 macstat; 574 int i; 575 int preamble_readwords; 576 struct sk_buff *skb; 577 578 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); 579 if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE)) 580 return; 581 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, 582 B43legacy_PIO_RXCTL_DATAAVAILABLE); 583 584 for (i = 0; i < 10; i++) { 585 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); 586 if (tmp & B43legacy_PIO_RXCTL_READY) 587 goto data_ready; 588 udelay(10); 589 } 590 b43legacydbg(queue->dev->wl, "PIO RX timed out\n"); 591 return; 592data_ready: 593 594 len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); 595 if (unlikely(len > 0x700)) { 596 pio_rx_error(queue, 0, "len > 0x700"); 597 return; 598 } 599 if (unlikely(len == 0 && queue->mmio_base != 600 B43legacy_MMIO_PIO4_BASE)) { 601 pio_rx_error(queue, 0, "len == 0"); 602 return; 603 } 604 preamble[0] = cpu_to_le16(len); 605 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) 606 preamble_readwords = 14 / sizeof(u16); 607 else 608 preamble_readwords = 18 / sizeof(u16); 609 for (i = 0; i < preamble_readwords; i++) { 610 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); 611 preamble[i + 1] = cpu_to_le16(tmp); 612 } 613 rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble; 614 macstat = le16_to_cpu(rxhdr->mac_status); 615 if (macstat & B43legacy_RX_MAC_FCSERR) { 616 pio_rx_error(queue, 617 (queue->mmio_base == B43legacy_MMIO_PIO1_BASE), 618 "Frame FCS error"); 619 return; 620 } 621 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) { 622 /* We received an xmit status. */ 623 struct b43legacy_hwtxstatus *hw; 624 625 hw = (struct b43legacy_hwtxstatus *)(preamble + 1); 626 b43legacy_handle_hwtxstatus(queue->dev, hw); 627 628 return; 629 } 630 631 skb = dev_alloc_skb(len); 632 if (unlikely(!skb)) { 633 pio_rx_error(queue, 1, "OOM"); 634 return; 635 } 636 skb_put(skb, len); 637 for (i = 0; i < len - 1; i += 2) { 638 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); 639 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp); 640 } 641 if (len % 2) { 642 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); 643 skb->data[len - 1] = (tmp & 0x00FF); 644 } 645 b43legacy_rx(queue->dev, skb, rxhdr); 646} 647 648void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue) 649{ 650 b43legacy_power_saving_ctl_bits(queue->dev, -1, 1); 651 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 652 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) 653 | B43legacy_PIO_TXCTL_SUSPEND); 654} 655 656void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue) 657{ 658 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, 659 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) 660 & ~B43legacy_PIO_TXCTL_SUSPEND); 661 b43legacy_power_saving_ctl_bits(queue->dev, -1, -1); 662 tasklet_schedule(&queue->txtask); 663} 664 665void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev) 666{ 667 struct b43legacy_pio *pio; 668 669 B43legacy_WARN_ON(!b43legacy_using_pio(dev)); 670 pio = &dev->pio; 671 pio->queue0->tx_frozen = 1; 672 pio->queue1->tx_frozen = 1; 673 pio->queue2->tx_frozen = 1; 674 pio->queue3->tx_frozen = 1; 675} 676 677void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev) 678{ 679 struct b43legacy_pio *pio; 680 681 B43legacy_WARN_ON(!b43legacy_using_pio(dev)); 682 pio = &dev->pio; 683 pio->queue0->tx_frozen = 0; 684 pio->queue1->tx_frozen = 0; 685 pio->queue2->tx_frozen = 0; 686 pio->queue3->tx_frozen = 0; 687 if (!list_empty(&pio->queue0->txqueue)) 688 tasklet_schedule(&pio->queue0->txtask); 689 if (!list_empty(&pio->queue1->txqueue)) 690 tasklet_schedule(&pio->queue1->txtask); 691 if (!list_empty(&pio->queue2->txqueue)) 692 tasklet_schedule(&pio->queue2->txtask); 693 if (!list_empty(&pio->queue3->txqueue)) 694 tasklet_schedule(&pio->queue3->txtask); 695} 696