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

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Date:	Fri, 1 Aug 2008 15:22:12 -0700 (PDT)
From:	Matthew Frost <artusemrys@...oo.com>
To:	Matthew Frost <artusemrys@...global.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Douglas Gilbert <dougg@...que.net>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Matthew Frost <artusemrys@...oo.com>,
	USB Storage list <usb-storage@...ts.one-eyed-alien.net>,
	linux-kernel@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [usb-storage] BUG: SCSI: usb storage SDHC card doesn't work in 2.6.27-rc1

--- Matthew Frost <artusemrys@...global.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
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