On Tue, 14 Feb 2006, Dwight Tovey wrote:
> I guess our current hardware just isn't going to let us go to the 2.6
> kernel. We'll have to just upgrade to the latest 2.4 kernel and stay
> there until we move to more current hardware. The real problem there
> though is that even then we'll have to keep both versions around until all
> of the old systems fade away.
>
> Matt and Alan - thanks again for all your help.
Don't give up yet. Here's a patch that makes 2.6 usb-storage behave much
more like the 2.4 version (i.e., slower). Maybe it will solve your
problem.
If it doesn't, then something must have changed in the OHCI driver. I
can't imagine what that might be, however.
Alan Stern
Index: usb-2.6/drivers/usb/storage/transport.c
===================================================================
--- usb-2.6.orig/drivers/usb/storage/transport.c
+++ usb-2.6/drivers/usb/storage/transport.c
@@ -494,16 +494,20 @@ static int usb_stor_bulk_transfer_sglist
int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe,
void *buf, unsigned int length_left, int use_sg, int *residual)
{
- int result;
+ int result = 0;
unsigned int partial;
+ struct scatterlist *sg;
/* are we scatter-gathering? */
if (use_sg) {
- /* use the usb core scatter-gather primitives */
- result = usb_stor_bulk_transfer_sglist(us, pipe,
- (struct scatterlist *) buf, use_sg,
- length_left, &partial);
- length_left -= partial;
+ for (sg = buf; use_sg > 0 && length_left > 0;
+ (--use_sg, ++sg)) {
+ result = usb_stor_bulk_transfer_sglist(us, pipe,
+ sg, 1, length_left, &partial);
+ length_left -= partial;
+ if (result != USB_STOR_XFER_GOOD)
+ break;
+ }
} else {
/* no scatter-gather, just make the request */
result = usb_stor_bulk_transfer_buf(us, pipe, buf,
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