aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic-2.4/patches/228-more_usb_fixes.patch
blob: f53a5247cad8efc546a75711bd4d3fd756c8345c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
diff -ur linux.old/drivers/scsi/hosts.c linux.dev/drivers/scsi/hosts.c
--- linux.old/drivers/scsi/hosts.c	2003-06-13 16:51:36.000000000 +0200
+++ linux.dev/drivers/scsi/hosts.c	2006-07-30 12:34:30.000000000 +0200
@@ -107,8 +107,21 @@
     if (shn) shn->host_registered = 0;
     /* else {} : This should not happen, we should panic here... */
     
+    /* If we are removing the last host registered, it is safe to reuse
+     * its host number (this avoids "holes" at boot time) (DB) 
+     * It is also safe to reuse those of numbers directly below which have
+     * been released earlier (to avoid some holes in numbering).
+     */
+    if(sh->host_no == max_scsi_hosts - 1) {
+	while(--max_scsi_hosts >= next_scsi_host) {
+	    shpnt = scsi_hostlist;
+	    while(shpnt && shpnt->host_no != max_scsi_hosts - 1)
+		shpnt = shpnt->next;
+	    if(shpnt)
+		break;
+	}
+    }
     next_scsi_host--;
-
     kfree((char *) sh);
 }
 
diff -ur linux.old/drivers/usb/hcd.c linux.dev/drivers/usb/hcd.c
--- linux.old/drivers/usb/hcd.c	2004-04-14 15:05:32.000000000 +0200
+++ linux.dev/drivers/usb/hcd.c	2006-07-30 11:49:06.000000000 +0200
@@ -1105,7 +1105,8 @@
 		break;
 	case PIPE_BULK:
 		allowed |= USB_DISABLE_SPD | USB_QUEUE_BULK
-				| USB_ZERO_PACKET | URB_NO_INTERRUPT;
+				| USB_ZERO_PACKET | URB_NO_INTERRUPT
+		        | URB_NO_TRANSFER_DMA_MAP;
 		break;
 	case PIPE_INTERRUPT:
 		allowed |= USB_DISABLE_SPD;
@@ -1212,7 +1213,8 @@
 					urb->setup_packet,
 					sizeof (struct usb_ctrlrequest),
 					PCI_DMA_TODEVICE);
-		if (urb->transfer_buffer_length != 0)
+		if (urb->transfer_buffer_length != 0
+			&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
 			urb->transfer_dma = pci_map_single (
 					hcd->pdev,
 					urb->transfer_buffer,
diff -ur linux.old/drivers/usb/host/ehci-hcd.c linux.dev/drivers/usb/host/ehci-hcd.c
--- linux.old/drivers/usb/host/ehci-hcd.c	2006-07-30 11:31:57.000000000 +0200
+++ linux.dev/drivers/usb/host/ehci-hcd.c	2006-07-30 11:48:14.000000000 +0200
@@ -399,6 +399,27 @@
 		ehci_mem_cleanup (ehci);
 		return retval;
 	}
+
+{
+	int misc_reg;
+	u32 vendor_id;
+	
+	pci_read_config_dword (ehci->hcd.pdev, PCI_VENDOR_ID, &vendor_id);
+	if (vendor_id == 0x31041106) {
+		/* VIA 6212 */
+		printk(KERN_INFO "EHCI: Enabling VIA 6212 workarounds\n", misc_reg);
+		pci_read_config_byte(ehci->hcd.pdev, 0x49, &misc_reg);
+		misc_reg &= ~0x20;
+		pci_write_config_byte(ehci->hcd.pdev, 0x49, misc_reg);
+		pci_read_config_byte(ehci->hcd.pdev, 0x49, &misc_reg);
+
+		pci_read_config_byte(ehci->hcd.pdev, 0x4b, &misc_reg);
+		misc_reg |= 0x20;
+		pci_write_config_byte(ehci->hcd.pdev, 0x4b, misc_reg);
+		pci_read_config_byte(ehci->hcd.pdev, 0x4b, &misc_reg);
+	}
+}
+
 	writel (INTR_MASK, &ehci->regs->intr_enable);
 	writel (ehci->periodic_dma, &ehci->regs->frame_list);
 
diff -ur linux.old/drivers/usb/host/ehci-q.c linux.dev/drivers/usb/host/ehci-q.c
--- linux.old/drivers/usb/host/ehci-q.c	2006-07-30 11:31:57.000000000 +0200
+++ linux.dev/drivers/usb/host/ehci-q.c	2006-07-30 12:10:15.000000000 +0200
@@ -791,6 +791,8 @@
 			writel (cmd, &ehci->regs->command);
 			ehci->hcd.state = USB_STATE_RUNNING;
 			/* posted write need not be known to HC yet ... */
+			
+			timer_action (ehci, TIMER_IO_WATCHDOG);
 		}
 	}
 
diff -ur linux.old/drivers/usb/host/usb-uhci.c linux.dev/drivers/usb/host/usb-uhci.c
--- linux.old/drivers/usb/host/usb-uhci.c	2004-11-17 12:54:21.000000000 +0100
+++ linux.dev/drivers/usb/host/usb-uhci.c	2006-07-30 12:10:16.000000000 +0200
@@ -3034,6 +3034,21 @@
 	
 	pci_set_master(dev);
 
+	{
+		u8 misc_reg;
+		u32 vendor_id;
+		
+		pci_read_config_dword (dev, PCI_VENDOR_ID, &vendor_id);
+		if (vendor_id == 0x30381106) {
+			/* VIA 6212 */
+			printk(KERN_INFO "UHCI: Enabling VIA 6212 workarounds\n");
+			pci_read_config_byte(dev, 0x41, &misc_reg);
+			misc_reg &= ~0x10;
+			pci_write_config_byte(dev, 0x41, misc_reg);
+			pci_read_config_byte(dev, 0x41, &misc_reg);
+		}
+	}
+	
 	/* Search for the IO base address.. */
 	for (i = 0; i < 6; i++) {
 
diff -ur linux.old/drivers/usb/storage/transport.c linux.dev/drivers/usb/storage/transport.c
--- linux.old/drivers/usb/storage/transport.c	2005-04-04 03:42:19.000000000 +0200
+++ linux.dev/drivers/usb/storage/transport.c	2006-07-30 12:22:56.000000000 +0200
@@ -54,6 +54,22 @@
 #include <linux/sched.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <linux/pci.h>
+#include "../hcd.h"
+
+/* These definitions mirror those in pci.h, so they can be used
+ * interchangeably with their PCI_ counterparts */
+enum dma_data_direction {
+	DMA_BIDIRECTIONAL = 0,
+	DMA_TO_DEVICE = 1,
+	DMA_FROM_DEVICE = 2,
+	DMA_NONE = 3,
+};
+
+#define dma_map_sg(d,s,n,dir) pci_map_sg(d,s,n,dir)
+#define dma_unmap_sg(d,s,n,dir) pci_unmap_sg(d,s,n,dir)
+
+
 
 /***********************************************************************
  * Helper routines
@@ -554,6 +570,543 @@
 	return US_BULK_TRANSFER_SHORT;
 }
 
+/*-------------------------------------------------------------------*/
+/**
+ * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
+ * @dev: device to which the scatterlist will be mapped
+ * @pipe: endpoint defining the mapping direction
+ * @sg: the scatterlist to unmap
+ * @n_hw_ents: the positive return value from usb_buffer_map_sg
+ *
+ * Reverses the effect of usb_buffer_map_sg().
+ */
+static void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe,
+		struct scatterlist *sg, int n_hw_ents)
+{
+	struct usb_bus *bus;
+	struct usb_hcd *hcd;
+	struct pci_dev *pdev;
+
+	if (!dev
+			|| !(bus = dev->bus)
+			|| !(hcd = bus->hcpriv)
+			|| !(pdev = hcd->pdev)
+			|| !pdev->dma_mask)
+		return;
+
+	dma_unmap_sg (pdev, sg, n_hw_ents,
+			usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+
+/**
+ * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint
+ * @dev: device to which the scatterlist will be mapped
+ * @pipe: endpoint defining the mapping direction
+ * @sg: the scatterlist to map
+ * @nents: the number of entries in the scatterlist
+ *
+ * Return value is either < 0 (indicating no buffers could be mapped), or
+ * the number of DMA mapping array entries in the scatterlist.
+ *
+ * The caller is responsible for placing the resulting DMA addresses from
+ * the scatterlist into URB transfer buffer pointers, and for setting the
+ * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs.
+ *
+ * Top I/O rates come from queuing URBs, instead of waiting for each one
+ * to complete before starting the next I/O.   This is particularly easy
+ * to do with scatterlists.  Just allocate and submit one URB for each DMA
+ * mapping entry returned, stopping on the first error or when all succeed.
+ * Better yet, use the usb_sg_*() calls, which do that (and more) for you.
+ *
+ * This call would normally be used when translating scatterlist requests,
+ * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it
+ * may be able to coalesce mappings for improved I/O efficiency.
+ *
+ * Reverse the effect of this call with usb_buffer_unmap_sg().
+ */
+static int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe,
+		struct scatterlist *sg, int nents)
+{
+	struct usb_bus		*bus;
+	struct usb_hcd *hcd;
+	struct pci_dev *pdev;
+
+	if (!dev
+			|| usb_pipecontrol (pipe)
+			|| !(bus = dev->bus)
+			|| !(hcd = bus->hcpriv)
+			|| !(pdev = hcd->pdev)
+			|| !pdev->dma_mask)
+		return -1;
+
+	// FIXME generic api broken like pci, can't report errors
+	return dma_map_sg (pdev, sg, nents,
+			usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+
+static void sg_clean (struct usb_sg_request *io)
+{
+	struct usb_hcd *hcd = io->dev->bus->hcpriv;
+	struct pci_dev *pdev = hcd->pdev;
+
+	if (io->urbs) {
+		while (io->entries--)
+			usb_free_urb (io->urbs [io->entries]);
+		kfree (io->urbs);
+		io->urbs = 0;
+	}
+	if (pdev->dma_mask != 0)
+		usb_buffer_unmap_sg (io->dev, io->pipe, io->sg, io->nents);
+	io->dev = 0;
+}
+
+static void sg_complete (struct urb *urb)
+{
+	struct usb_sg_request	*io = (struct usb_sg_request *) urb->context;
+
+	spin_lock (&io->lock);
+
+	/* In 2.5 we require hcds' endpoint queues not to progress after fault
+	 * reports, until the completion callback (this!) returns.  That lets
+	 * device driver code (like this routine) unlink queued urbs first,
+	 * if it needs to, since the HC won't work on them at all.  So it's
+	 * not possible for page N+1 to overwrite page N, and so on.
+	 *
+	 * That's only for "hard" faults; "soft" faults (unlinks) sometimes
+	 * complete before the HCD can get requests away from hardware,
+	 * though never during cleanup after a hard fault.
+	 */
+	if (io->status
+			&& (io->status != -ECONNRESET
+				|| urb->status != -ECONNRESET)
+			&& urb->actual_length) {
+		US_DEBUGP("Error: %s ep%d%s scatterlist error %d/%d\n",
+			io->dev->devpath,
+			usb_pipeendpoint (urb->pipe),
+			usb_pipein (urb->pipe) ? "in" : "out",
+			urb->status, io->status);
+		// BUG ();
+	}
+
+	if (urb->status && urb->status != -ECONNRESET) {
+		int		i, found, status;
+
+		io->status = urb->status;
+
+		/* the previous urbs, and this one, completed already.
+		 * unlink pending urbs so they won't rx/tx bad data.
+		 */
+		for (i = 0, found = 0; i < io->entries; i++) {
+			if (!io->urbs [i])
+				continue;
+			if (found) {
+				status = usb_unlink_urb (io->urbs [i]);
+				if (status != -EINPROGRESS && status != -EBUSY)
+					US_DEBUGP("Error: %s, unlink --> %d\n", __FUNCTION__, status);
+			} else if (urb == io->urbs [i])
+				found = 1;
+		}
+	}
+	urb->dev = 0;
+
+	/* on the last completion, signal usb_sg_wait() */
+	io->bytes += urb->actual_length;
+	io->count--;
+	if (!io->count)
+		complete (&io->complete);
+
+	spin_unlock (&io->lock);
+}
+
+/**
+ * usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request
+ * @io: request block being initialized.  until usb_sg_wait() returns,
+ *	treat this as a pointer to an opaque block of memory,
+ * @dev: the usb device that will send or receive the data
+ * @pipe: endpoint "pipe" used to transfer the data
+ * @period: polling rate for interrupt endpoints, in frames or
+ * 	(for high speed endpoints) microframes; ignored for bulk
+ * @sg: scatterlist entries
+ * @nents: how many entries in the scatterlist
+ * @length: how many bytes to send from the scatterlist, or zero to
+ * 	send every byte identified in the list.
+ * @mem_flags: SLAB_* flags affecting memory allocations in this call
+ *
+ * Returns zero for success, else a negative errno value.  This initializes a
+ * scatter/gather request, allocating resources such as I/O mappings and urb
+ * memory (except maybe memory used by USB controller drivers).
+ *
+ * The request must be issued using usb_sg_wait(), which waits for the I/O to
+ * complete (or to be canceled) and then cleans up all resources allocated by
+ * usb_sg_init().
+ *
+ * The request may be canceled with usb_sg_cancel(), either before or after
+ * usb_sg_wait() is called.
+ */
+int usb_sg_init (
+	struct usb_sg_request	*io,
+	struct usb_device	*dev,
+	unsigned		pipe, 
+	unsigned		period,
+	struct scatterlist	*sg,
+	int			nents,
+	size_t			length,
+	int			mem_flags
+)
+{
+	int			i;
+	int			urb_flags;
+	int			dma;
+	struct usb_hcd *hcd;
+
+	hcd = dev->bus->hcpriv;
+
+	if (!io || !dev || !sg
+			|| usb_pipecontrol (pipe)
+			|| usb_pipeisoc (pipe)
+			|| nents <= 0)
+		return -EINVAL;
+
+	spin_lock_init (&io->lock);
+	io->dev = dev;
+	io->pipe = pipe;
+	io->sg = sg;
+	io->nents = nents;
+
+	/* not all host controllers use DMA (like the mainstream pci ones);
+	 * they can use PIO (sl811) or be software over another transport.
+	 */
+	dma = (hcd->pdev->dma_mask != 0);
+	if (dma)
+		io->entries = usb_buffer_map_sg (dev, pipe, sg, nents);
+	else
+		io->entries = nents;
+
+	/* initialize all the urbs we'll use */
+	if (io->entries <= 0)
+		return io->entries;
+
+	io->count = 0;
+	io->urbs = kmalloc (io->entries * sizeof *io->urbs, mem_flags);
+	if (!io->urbs)
+		goto nomem;
+
+	urb_flags = USB_ASYNC_UNLINK | URB_NO_INTERRUPT | URB_NO_TRANSFER_DMA_MAP;
+	if (usb_pipein (pipe))
+		urb_flags |= URB_SHORT_NOT_OK;
+
+	for (i = 0; i < io->entries; i++, io->count = i) {
+		unsigned		len;
+
+		io->urbs [i] = usb_alloc_urb (0);
+		if (!io->urbs [i]) {
+			io->entries = i;
+			goto nomem;
+		}
+
+		io->urbs [i]->dev = 0;
+		io->urbs [i]->pipe = pipe;
+		io->urbs [i]->interval = period;
+		io->urbs [i]->transfer_flags = urb_flags;
+
+		io->urbs [i]->complete = sg_complete;
+		io->urbs [i]->context = io;
+		io->urbs [i]->status = -EINPROGRESS;
+		io->urbs [i]->actual_length = 0;
+
+		if (dma) {
+			/* hc may use _only_ transfer_dma */
+			io->urbs [i]->transfer_dma = sg_dma_address (sg + i);
+			len = sg_dma_len (sg + i);
+		} else {
+			/* hc may use _only_ transfer_buffer */
+			io->urbs [i]->transfer_buffer =
+				page_address (sg [i].page) + sg [i].offset;
+			len = sg [i].length;
+		}
+
+		if (length) {
+			len = min_t (unsigned, len, length);
+			length -= len;
+			if (length == 0)
+				io->entries = i + 1;
+		}
+		io->urbs [i]->transfer_buffer_length = len;
+	}
+	io->urbs [--i]->transfer_flags &= ~URB_NO_INTERRUPT;
+
+	/* transaction state */
+	io->status = 0;
+	io->bytes = 0;
+	init_completion (&io->complete);
+	return 0;
+
+nomem:
+	sg_clean (io);
+	return -ENOMEM;
+}
+
+/**
+ * usb_sg_cancel - stop scatter/gather i/o issued by usb_sg_wait()
+ * @io: request block, initialized with usb_sg_init()
+ *
+ * This stops a request after it has been started by usb_sg_wait().
+ * It can also prevents one initialized by usb_sg_init() from starting,
+ * so that call just frees resources allocated to the request.
+ */
+void usb_sg_cancel (struct usb_sg_request *io)
+{
+	unsigned long	flags;
+
+	spin_lock_irqsave (&io->lock, flags);
+
+	/* shut everything down, if it didn't already */
+	if (!io->status) {
+		int	i;
+
+		io->status = -ECONNRESET;
+		for (i = 0; i < io->entries; i++) {
+			int	retval;
+
+			if (!io->urbs [i]->dev)
+				continue;
+			retval = usb_unlink_urb (io->urbs [i]);
+			if (retval != -EINPROGRESS && retval != -EBUSY)
+				US_DEBUGP("WARNING: %s, unlink --> %d\n", __FUNCTION__, retval);
+		}
+	}
+	spin_unlock_irqrestore (&io->lock, flags);
+}
+
+/**
+ * usb_sg_wait - synchronously execute scatter/gather request
+ * @io: request block handle, as initialized with usb_sg_init().
+ * 	some fields become accessible when this call returns.
+ * Context: !in_interrupt ()
+ *
+ * This function blocks until the specified I/O operation completes.  It
+ * leverages the grouping of the related I/O requests to get good transfer
+ * rates, by queueing the requests.  At higher speeds, such queuing can
+ * significantly improve USB throughput.
+ *
+ * There are three kinds of completion for this function.
+ * (1) success, where io->status is zero.  The number of io->bytes
+ *     transferred is as requested.
+ * (2) error, where io->status is a negative errno value.  The number
+ *     of io->bytes transferred before the error is usually less
+ *     than requested, and can be nonzero.
+ * (3) cancelation, a type of error with status -ECONNRESET that
+ *     is initiated by usb_sg_cancel().
+ *
+ * When this function returns, all memory allocated through usb_sg_init() or
+ * this call will have been freed.  The request block parameter may still be
+ * passed to usb_sg_cancel(), or it may be freed.  It could also be
+ * reinitialized and then reused.
+ *
+ * Data Transfer Rates:
+ *
+ * Bulk transfers are valid for full or high speed endpoints.
+ * The best full speed data rate is 19 packets of 64 bytes each
+ * per frame, or 1216 bytes per millisecond.
+ * The best high speed data rate is 13 packets of 512 bytes each
+ * per microframe, or 52 KBytes per millisecond.
+ *
+ * The reason to use interrupt transfers through this API would most likely
+ * be to reserve high speed bandwidth, where up to 24 KBytes per millisecond
+ * could be transferred.  That capability is less useful for low or full
+ * speed interrupt endpoints, which allow at most one packet per millisecond,
+ * of at most 8 or 64 bytes (respectively).
+ */
+void usb_sg_wait (struct usb_sg_request *io)
+{
+	int		i, entries = io->entries;
+
+	/* queue the urbs.  */
+	spin_lock_irq (&io->lock);
+	for (i = 0; i < entries && !io->status; i++) {
+		int	retval;
+
+		io->urbs [i]->dev = io->dev;
+		retval = usb_submit_urb (io->urbs [i]);
+
+		/* after we submit, let completions or cancelations fire;
+		 * we handshake using io->status.
+		 */
+		spin_unlock_irq (&io->lock);
+		switch (retval) {
+			/* maybe we retrying will recover */
+		case -ENXIO:	// hc didn't queue this one
+		case -EAGAIN:
+		case -ENOMEM:
+			io->urbs [i]->dev = 0;
+			retval = 0;
+			i--;
+			yield ();
+			break;
+
+			/* no error? continue immediately.
+			 *
+			 * NOTE: to work better with UHCI (4K I/O buffer may
+			 * need 3K of TDs) it may be good to limit how many
+			 * URBs are queued at once; N milliseconds?
+			 */
+		case 0:
+			cpu_relax ();
+			break;
+
+			/* fail any uncompleted urbs */
+		default:
+			spin_lock_irq (&io->lock);
+			io->count -= entries - i;
+			if (io->status == -EINPROGRESS)
+				io->status = retval;
+			if (io->count == 0)
+				complete (&io->complete);
+			spin_unlock_irq (&io->lock);
+
+			io->urbs [i]->dev = 0;
+			io->urbs [i]->status = retval;
+			
+			US_DEBUGP("%s, submit --> %d\n", __FUNCTION__, retval);
+			usb_sg_cancel (io);
+		}
+		spin_lock_irq (&io->lock);
+		if (retval && io->status == -ECONNRESET)
+			io->status = retval;
+	}
+	spin_unlock_irq (&io->lock);
+
+	/* OK, yes, this could be packaged as non-blocking.
+	 * So could the submit loop above ... but it's easier to
+	 * solve neither problem than to solve both!
+	 */
+	wait_for_completion (&io->complete);
+
+	sg_clean (io);
+}
+
+/*
+ * Interpret the results of a URB transfer
+ *
+ * This function prints appropriate debugging messages, clears halts on
+ * non-control endpoints, and translates the status to the corresponding
+ * USB_STOR_XFER_xxx return code.
+ */
+static int interpret_urb_result(struct us_data *us, unsigned int pipe,
+		unsigned int length, int result, unsigned int partial)
+{
+	US_DEBUGP("Status code %d; transferred %u/%u\n",
+			result, partial, length);
+	switch (result) {
+
+	/* no error code; did we send all the data? */
+	case 0:
+		if (partial != length) {
+			US_DEBUGP("-- short transfer\n");
+			return USB_STOR_XFER_SHORT;
+		}
+
+		US_DEBUGP("-- transfer complete\n");
+		return USB_STOR_XFER_GOOD;
+
+	/* stalled */
+	case -EPIPE:
+		/* for control endpoints, (used by CB[I]) a stall indicates
+		 * a failed command */
+		if (usb_pipecontrol(pipe)) {
+			US_DEBUGP("-- stall on control pipe\n");
+			return USB_STOR_XFER_STALLED;
+		}
+
+		/* for other sorts of endpoint, clear the stall */
+		US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
+		if (usb_stor_clear_halt(us, pipe) < 0)
+			return USB_STOR_XFER_ERROR;
+		return USB_STOR_XFER_STALLED;
+
+	/* timeout or excessively long NAK */
+	case -ETIMEDOUT:
+		US_DEBUGP("-- timeout or NAK\n");
+		return USB_STOR_XFER_ERROR;
+
+	/* babble - the device tried to send more than we wanted to read */
+	case -EOVERFLOW:
+		US_DEBUGP("-- babble\n");
+		return USB_STOR_XFER_LONG;
+
+	/* the transfer was cancelled by abort, disconnect, or timeout */
+	case -ECONNRESET:
+		US_DEBUGP("-- transfer cancelled\n");
+		return USB_STOR_XFER_ERROR;
+
+	/* short scatter-gather read transfer */
+	case -EREMOTEIO:
+		US_DEBUGP("-- short read transfer\n");
+		return USB_STOR_XFER_SHORT;
+
+	/* abort or disconnect in progress */
+	case -EIO:
+		US_DEBUGP("-- abort or disconnect in progress\n");
+		return USB_STOR_XFER_ERROR;
+
+	/* the catch-all error case */
+	default:
+		US_DEBUGP("-- unknown error\n");
+		return USB_STOR_XFER_ERROR;
+	}
+}
+
+/*
+ * Transfer a scatter-gather list via bulk transfer
+ *
+ * This function does basically the same thing as usb_stor_bulk_msg()
+ * above, but it uses the usbcore scatter-gather library.
+ */
+int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
+		struct scatterlist *sg, int num_sg, unsigned int length,
+		unsigned int *act_len)
+{
+	int result;
+
+	/* don't submit s-g requests during abort/disconnect processing */
+	if (us->flags & ABORTING_OR_DISCONNECTING)
+		return USB_STOR_XFER_ERROR;
+
+	/* initialize the scatter-gather request block */
+	US_DEBUGP("%s: xfer %u bytes, %d entries\n", __FUNCTION__,
+			length, num_sg);
+	result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0,
+			sg, num_sg, length, SLAB_NOIO);
+	if (result) {
+		US_DEBUGP("usb_sg_init returned %d\n", result);
+		return USB_STOR_XFER_ERROR;
+	}
+
+	/* since the block has been initialized successfully, it's now
+	 * okay to cancel it */
+	set_bit(US_FLIDX_SG_ACTIVE, &us->flags);
+
+	/* did an abort/disconnect occur during the submission? */
+	if (us->flags & ABORTING_OR_DISCONNECTING) {
+
+		/* cancel the request, if it hasn't been cancelled already */
+		if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->flags)) {
+			US_DEBUGP("-- cancelling sg request\n");
+			usb_sg_cancel(&us->current_sg);
+		}
+	}
+
+	/* wait for the completion of the transfer */
+	usb_sg_wait(&us->current_sg);
+	clear_bit(US_FLIDX_SG_ACTIVE, &us->flags);
+
+	result = us->current_sg.status;
+	if (act_len)
+		*act_len = us->current_sg.bytes;
+	return interpret_urb_result(us, pipe, length, result,
+			us->current_sg.bytes);
+}
+
 /*
  * Transfer an entire SCSI command's worth of data payload over the bulk
  * pipe.
@@ -569,6 +1122,8 @@
 	struct scatterlist *sg;
 	unsigned int total_transferred = 0;
 	unsigned int transfer_amount;
+	unsigned int partial;
+	unsigned int pipe;
 
 	/* calculate how much we want to transfer */
 	transfer_amount = usb_stor_transfer_length(srb);
@@ -585,23 +1140,34 @@
 		 * make the appropriate requests for each, until done
 		 */
 		sg = (struct scatterlist *) srb->request_buffer;
-		for (i = 0; i < srb->use_sg; i++) {
-
-			/* transfer the lesser of the next buffer or the
-			 * remaining data */
-			if (transfer_amount - total_transferred >= 
-					sg[i].length) {
-				result = usb_stor_transfer_partial(us,
-						sg[i].address, sg[i].length);
-				total_transferred += sg[i].length;
-			} else
-				result = usb_stor_transfer_partial(us,
-						sg[i].address,
-						transfer_amount - total_transferred);
-
-			/* if we get an error, end the loop here */
-			if (result)
-				break;
+		if (us->pusb_dev->speed == USB_SPEED_HIGH) {
+			/* calculate the appropriate pipe information */
+			if (us->srb->sc_data_direction == SCSI_DATA_READ)
+				pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
+			else
+				pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
+			/* use the usb core scatter-gather primitives */
+			result = usb_stor_bulk_transfer_sglist(us, pipe,
+					sg, srb->use_sg, transfer_amount, &partial);
+		} else {
+			for (i = 0; i < srb->use_sg; i++) {
+
+				/* transfer the lesser of the next buffer or the
+				 * remaining data */
+				if (transfer_amount - total_transferred >= 
+						sg[i].length) {
+					result = usb_stor_transfer_partial(us,
+							sg[i].address, sg[i].length);
+					total_transferred += sg[i].length;
+				} else
+					result = usb_stor_transfer_partial(us,
+							sg[i].address,
+							transfer_amount - total_transferred);
+
+				/* if we get an error, end the loop here */
+				if (result)
+					break;
+			}
 		}
 	}
 	else
diff -ur linux.old/drivers/usb/storage/transport.h linux.dev/drivers/usb/storage/transport.h
--- linux.old/drivers/usb/storage/transport.h	2003-08-25 13:44:42.000000000 +0200
+++ linux.dev/drivers/usb/storage/transport.h	2006-07-30 12:10:16.000000000 +0200
@@ -127,6 +127,16 @@
 #define US_BULK_TRANSFER_ABORTED	3  /* transfer canceled             */
 
 /*
+ * usb_stor_bulk_transfer_xxx() return codes, in order of severity
+ */
+
+#define USB_STOR_XFER_GOOD		0	/* good transfer                 */
+#define USB_STOR_XFER_SHORT		1	/* transferred less than expected */
+#define USB_STOR_XFER_STALLED	2	/* endpoint stalled              */
+#define USB_STOR_XFER_LONG		3	/* device tried to send too much */
+#define USB_STOR_XFER_ERROR		4	/* transfer died in the middle   */
+
+/*
  * Transport return codes
  */
 
diff -ur linux.old/drivers/usb/storage/usb.h linux.dev/drivers/usb/storage/usb.h
--- linux.old/drivers/usb/storage/usb.h	2005-04-04 03:42:20.000000000 +0200
+++ linux.dev/drivers/usb/storage/usb.h	2006-07-30 12:11:06.000000000 +0200
@@ -111,6 +111,60 @@
 typedef void (*proto_cmnd)(Scsi_Cmnd*, struct us_data*);
 typedef void (*extra_data_destructor)(void *);	 /* extra data destructor   */
 
+/* Dynamic flag definitions: used in set_bit() etc. */
+#define US_FLIDX_URB_ACTIVE	18  /* 0x00040000  current_urb is in use  */
+#define US_FLIDX_SG_ACTIVE	19  /* 0x00080000  current_sg is in use   */
+#define US_FLIDX_ABORTING	20  /* 0x00100000  abort is in progress   */
+#define US_FLIDX_DISCONNECTING	21  /* 0x00200000  disconnect in progress */
+#define ABORTING_OR_DISCONNECTING	((1UL << US_FLIDX_ABORTING) | \
+					 (1UL << US_FLIDX_DISCONNECTING))
+#define US_FLIDX_RESETTING	22  /* 0x00400000  device reset in progress */
+
+/* processing state machine states */
+#define US_STATE_IDLE		1
+#define US_STATE_RUNNING	2
+#define US_STATE_RESETTING	3
+#define US_STATE_ABORTING	4
+
+/**
+ * struct usb_sg_request - support for scatter/gather I/O
+ * @status: zero indicates success, else negative errno
+ * @bytes: counts bytes transferred.
+ *
+ * These requests are initialized using usb_sg_init(), and then are used
+ * as request handles passed to usb_sg_wait() or usb_sg_cancel().  Most
+ * members of the request object aren't for driver access.
+ *
+ * The status and bytecount values are valid only after usb_sg_wait()
+ * returns.  If the status is zero, then the bytecount matches the total
+ * from the request.
+ *
+ * After an error completion, drivers may need to clear a halt condition
+ * on the endpoint.
+ */
+struct usb_sg_request {
+	int			status;
+	size_t			bytes;
+
+	/* 
+	 * members below are private to usbcore,
+	 * and are not provided for driver access!
+	 */
+	spinlock_t		lock;
+
+	struct usb_device	*dev;
+	int			pipe;
+	struct scatterlist	*sg;
+	int			nents;
+
+	int			entries;
+	struct urb		**urbs;
+
+	int			count;
+	struct completion	complete;
+};
+
+
 /* we allocate one of these for every device that we remember */
 struct us_data {
 	struct us_data		*next;		 /* next device */
@@ -171,6 +225,7 @@
 	struct urb		*current_urb;	 /* non-int USB requests */
 	struct completion	current_done;	 /* the done flag        */
 	unsigned int		tag;		 /* tag for bulk CBW/CSW */
+	struct usb_sg_request	current_sg;  /* scatter-gather req.  */
 
 	/* the semaphore for sleeping the control thread */
 	struct semaphore	sema;		 /* to sleep thread on   */
diff -ur linux.old/include/linux/usb.h linux.dev/include/linux/usb.h
--- linux.old/include/linux/usb.h	2004-11-17 12:54:22.000000000 +0100
+++ linux.dev/include/linux/usb.h	2006-07-30 12:19:19.000000000 +0200
@@ -483,6 +483,8 @@
 #define URB_NO_INTERRUPT	0x0080	/* HINT: no non-error interrupt needed */
 					/* ... less overhead for QUEUE_BULK */
 #define USB_TIMEOUT_KILLED	0x1000	// only set by HCD!
+#define URB_NO_TRANSFER_DMA_MAP	0x0400	/* urb->transfer_dma valid on submit */
+#define URB_NO_SETUP_DMA_MAP	0x0800	/* urb->setup_dma valid on submit */
 
 struct iso_packet_descriptor
 {