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path: root/drivers/net/usb/usbnet.c
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Diffstat (limited to 'drivers/net/usb/usbnet.c')
-rw-r--r--drivers/net/usb/usbnet.c76
1 files changed, 39 insertions, 37 deletions
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index a12f576391cf..86b690843362 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -192,7 +192,7 @@ static int init_status (struct usbnet *dev, struct usb_interface *intf)
192 usb_pipeendpoint(pipe), maxp, period); 192 usb_pipeendpoint(pipe), maxp, period);
193 } 193 }
194 } 194 }
195 return 0; 195 return 0;
196} 196}
197 197
198/* Passes this packet up the stack, updating its accounting. 198/* Passes this packet up the stack, updating its accounting.
@@ -326,7 +326,7 @@ static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
326 if (netif_running (dev->net) 326 if (netif_running (dev->net)
327 && netif_device_present (dev->net) 327 && netif_device_present (dev->net)
328 && !test_bit (EVENT_RX_HALT, &dev->flags)) { 328 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
329 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){ 329 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
330 case -EPIPE: 330 case -EPIPE:
331 usbnet_defer_kevent (dev, EVENT_RX_HALT); 331 usbnet_defer_kevent (dev, EVENT_RX_HALT);
332 break; 332 break;
@@ -393,8 +393,8 @@ static void rx_complete (struct urb *urb)
393 entry->urb = NULL; 393 entry->urb = NULL;
394 394
395 switch (urb_status) { 395 switch (urb_status) {
396 // success 396 /* success */
397 case 0: 397 case 0:
398 if (skb->len < dev->net->hard_header_len) { 398 if (skb->len < dev->net->hard_header_len) {
399 entry->state = rx_cleanup; 399 entry->state = rx_cleanup;
400 dev->stats.rx_errors++; 400 dev->stats.rx_errors++;
@@ -404,28 +404,30 @@ static void rx_complete (struct urb *urb)
404 } 404 }
405 break; 405 break;
406 406
407 // stalls need manual reset. this is rare ... except that 407 /* stalls need manual reset. this is rare ... except that
408 // when going through USB 2.0 TTs, unplug appears this way. 408 * when going through USB 2.0 TTs, unplug appears this way.
409 // we avoid the highspeed version of the ETIMEOUT/EILSEQ 409 * we avoid the highspeed version of the ETIMEOUT/EILSEQ
410 // storm, recovering as needed. 410 * storm, recovering as needed.
411 case -EPIPE: 411 */
412 case -EPIPE:
412 dev->stats.rx_errors++; 413 dev->stats.rx_errors++;
413 usbnet_defer_kevent (dev, EVENT_RX_HALT); 414 usbnet_defer_kevent (dev, EVENT_RX_HALT);
414 // FALLTHROUGH 415 // FALLTHROUGH
415 416
416 // software-driven interface shutdown 417 /* software-driven interface shutdown */
417 case -ECONNRESET: // async unlink 418 case -ECONNRESET: /* async unlink */
418 case -ESHUTDOWN: // hardware gone 419 case -ESHUTDOWN: /* hardware gone */
419 if (netif_msg_ifdown (dev)) 420 if (netif_msg_ifdown (dev))
420 devdbg (dev, "rx shutdown, code %d", urb_status); 421 devdbg (dev, "rx shutdown, code %d", urb_status);
421 goto block; 422 goto block;
422 423
423 // we get controller i/o faults during khubd disconnect() delays. 424 /* we get controller i/o faults during khubd disconnect() delays.
424 // throttle down resubmits, to avoid log floods; just temporarily, 425 * throttle down resubmits, to avoid log floods; just temporarily,
425 // so we still recover when the fault isn't a khubd delay. 426 * so we still recover when the fault isn't a khubd delay.
426 case -EPROTO: 427 */
427 case -ETIME: 428 case -EPROTO:
428 case -EILSEQ: 429 case -ETIME:
430 case -EILSEQ:
429 dev->stats.rx_errors++; 431 dev->stats.rx_errors++;
430 if (!timer_pending (&dev->delay)) { 432 if (!timer_pending (&dev->delay)) {
431 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 433 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
@@ -438,12 +440,12 @@ block:
438 urb = NULL; 440 urb = NULL;
439 break; 441 break;
440 442
441 // data overrun ... flush fifo? 443 /* data overrun ... flush fifo? */
442 case -EOVERFLOW: 444 case -EOVERFLOW:
443 dev->stats.rx_over_errors++; 445 dev->stats.rx_over_errors++;
444 // FALLTHROUGH 446 // FALLTHROUGH
445 447
446 default: 448 default:
447 entry->state = rx_cleanup; 449 entry->state = rx_cleanup;
448 dev->stats.rx_errors++; 450 dev->stats.rx_errors++;
449 if (netif_msg_rx_err (dev)) 451 if (netif_msg_rx_err (dev))
@@ -471,22 +473,22 @@ static void intr_complete (struct urb *urb)
471 int status = urb->status; 473 int status = urb->status;
472 474
473 switch (status) { 475 switch (status) {
474 /* success */ 476 /* success */
475 case 0: 477 case 0:
476 dev->driver_info->status(dev, urb); 478 dev->driver_info->status(dev, urb);
477 break; 479 break;
478 480
479 /* software-driven interface shutdown */ 481 /* software-driven interface shutdown */
480 case -ENOENT: // urb killed 482 case -ENOENT: /* urb killed */
481 case -ESHUTDOWN: // hardware gone 483 case -ESHUTDOWN: /* hardware gone */
482 if (netif_msg_ifdown (dev)) 484 if (netif_msg_ifdown (dev))
483 devdbg (dev, "intr shutdown, code %d", status); 485 devdbg (dev, "intr shutdown, code %d", status);
484 return; 486 return;
485 487
486 /* NOTE: not throttling like RX/TX, since this endpoint 488 /* NOTE: not throttling like RX/TX, since this endpoint
487 * already polls infrequently 489 * already polls infrequently
488 */ 490 */
489 default: 491 default:
490 devdbg (dev, "intr status %d", status); 492 devdbg (dev, "intr status %d", status);
491 break; 493 break;
492 } 494 }
@@ -569,9 +571,9 @@ static int usbnet_stop (struct net_device *net)
569 temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq); 571 temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq);
570 572
571 // maybe wait for deletions to finish. 573 // maybe wait for deletions to finish.
572 while (!skb_queue_empty(&dev->rxq) && 574 while (!skb_queue_empty(&dev->rxq)
573 !skb_queue_empty(&dev->txq) && 575 && !skb_queue_empty(&dev->txq)
574 !skb_queue_empty(&dev->done)) { 576 && !skb_queue_empty(&dev->done)) {
575 msleep(UNLINK_TIMEOUT_MS); 577 msleep(UNLINK_TIMEOUT_MS);
576 if (netif_msg_ifdown (dev)) 578 if (netif_msg_ifdown (dev))
577 devdbg (dev, "waited for %d urb completions", temp); 579 devdbg (dev, "waited for %d urb completions", temp);
@@ -1011,16 +1013,16 @@ static void usbnet_bh (unsigned long param)
1011 while ((skb = skb_dequeue (&dev->done))) { 1013 while ((skb = skb_dequeue (&dev->done))) {
1012 entry = (struct skb_data *) skb->cb; 1014 entry = (struct skb_data *) skb->cb;
1013 switch (entry->state) { 1015 switch (entry->state) {
1014 case rx_done: 1016 case rx_done:
1015 entry->state = rx_cleanup; 1017 entry->state = rx_cleanup;
1016 rx_process (dev, skb); 1018 rx_process (dev, skb);
1017 continue; 1019 continue;
1018 case tx_done: 1020 case tx_done:
1019 case rx_cleanup: 1021 case rx_cleanup:
1020 usb_free_urb (entry->urb); 1022 usb_free_urb (entry->urb);
1021 dev_kfree_skb (skb); 1023 dev_kfree_skb (skb);
1022 continue; 1024 continue;
1023 default: 1025 default:
1024 devdbg (dev, "bogus skb state %d", entry->state); 1026 devdbg (dev, "bogus skb state %d", entry->state);
1025 } 1027 }
1026 } 1028 }