linux-kernel - Re: USB serial regression 2.6.31.1 -> 2.6.31.2 [PATCH]

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Date:	Mon, 12 Oct 2009 08:18:18 -0700 (PDT)
From:	Ben Efros <ben@...doctor.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Josua Dietze <digidietze@...isberghof.de>,
	fangxiaozhi <huananhu@...wei.com>, Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	Hugh Blemings <hugh@...mings.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 [PATCH]


----- "Alan Stern" <stern@...land.harvard.edu> wrote:

> > >  Signed-off-by: Ben Efros <ben@...doctor.com>
> > 
> > Tested-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > 
> > > --- linux-2.6.31.1/drivers/usb/storage/transport.c       
> 2009-09-24 08:45:25.000000000 -0700
> > > +++ linux-2.6.31.1.new/drivers/usb/storage/transport.c       
> 2009-10-11 08:06:26.000000000 -0700
> > > @@ -696,7 +696,7 @@ void usb_stor_invoke_transport(struct sc
> > >                  /* device supports and needs bigger sense buffer
> */
> > >                  if (us->fflags & US_FL_SANE_SENSE)
> > >                          sense_size = ~0;
> > > -
> > > +Retry_Sense:
> > >                  US_DEBUGP("Issuing auto-REQUEST_SENSE\n");
> > >  
> > >                  scsi_eh_prep_cmnd(srb, &ses, NULL, 0,
> sense_size);
> > > @@ -723,6 +723,12 @@ void usb_stor_invoke_transport(struct sc
> > >                  if (temp_result != USB_STOR_TRANSPORT_GOOD) {
> > >                          US_DEBUGP("-- auto-sense failure\n");
> > >  
> > > +                        if ((us->fflags & US_FL_SANE_SENSE) &&
> > > +                            sense_size != US_SENSE_SIZE) {
> > > +                                sense_size = US_SENSE_SIZE;
> > > +                                US_DEBUGP("-- retry without
> SANE_SENSE\n");
> > > +                                goto Retry_Sense;
> > > +                        }
> 
> Except that this is wrong.  We can retry if temp_result == 
> USB_STOR_TRANSPORT_FAILURE, but we should not retry if temp_result ==
> USB_STOR_TRANSPORT_ERROR.
> 

Agreed.
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