Re: [usb-storage] BUG: SCSI: usb storage SDHC card doesn't work in 2.6.27-rc1

Matthew Frost
2008-08-08T21:07:40Z

--- Matthew Frost <artusemrys@yahoo.com> wrote:

> --- Matthew Frost <artusemrys@sbcglobal.net> wrote:
>
> > Alan Stern wrote:
> > > > The patches to fix this that I have tried do not apply
> > > > cleanly to lk 2.6.26 (and break during compile if forced:
> > > > "us->fflags" is not defined).
> > > >
> > > > Is there a lk 2.6.26 patch available?
> > >
> > > Sorry about that; my patches are against the USB development tree and
> > > I tend to forget to redo them against the vanilla kernel. Below is a
> > > patch against 2.6.26. Or you can just edit the original patch and
> > > change the occurrences of "fflags" to "flags".
> > >
> > > Alan Stern
> > >
> > >
> > > Index: 2.6.26/drivers/usb/storage/transport.c
> > > ===================================================================
> > > --- 2.6.26.orig/drivers/usb/storage/transport.c
> > > +++ 2.6.26/drivers/usb/storage/transport.c
> > > @@ -1034,8 +1034,21 @@ int usb_stor_Bulk_transport(struct scsi_
> > >
> > > /* try to compute the actual residue, based on how much data
> > > * was really transferred and what the device tells us */
> > > - if (residue) {
> > > - if (!(us->flags & US_FL_IGNORE_RESIDUE)) {
> > > + if (residue && !(us->flags & US_FL_IGNORE_RESIDUE)) {
> > > +
> > > + /* Heuristically detect devices that generate bogus residues
> > > + * by seeing what happens with INQUIRY and READ CAPACITY
> > > + * commands.
> > > + */
> > > + if (bcs->Status == US_BULK_STAT_OK &&
> > > + scsi_get_resid(srb) == 0 &&
> > > + ((srb->cmnd[0] == INQUIRY &&
> > > + transfer_length == 36) ||
> > > + (srb->cmnd[0] == READ_CAPACITY &&
> > > + transfer_length == 8))) {
> > > + us->flags |= US_FL_IGNORE_RESIDUE;
> > > +
> > > + } else {
> > > residue = min(residue, transfer_length);
> > > scsi_set_resid(srb, max(scsi_get_resid(srb),
> > > (int) residue));
> > >
> > >
> >
> > Thanks! I've been trying to fix it manually, and it wouldn't work.
> Trying
> > this version now. Let's see if this fixes my problem.
> >
> > Matt Frost
> >
>
> Tested under two distributions, this patch restores correct functionality
> to my hardware. Thank you very much!
>
> Matt
>
Update/sqeaking-of-the-wheel:

The same problem still happens under 2.6.27-rc2, and I haven't seen this
bumped to -stable, either. It continues to solve the problem here.

Matt