Re: [2.6.14-rc1] sym scsi boot hang

[Mike Christie <michaelc@cs.wisc.edu>]

Mike Christie wrote:
> Alan Stern wrote:
>
> > On Wed, 14 Sep 2005, Anton Blanchard wrote:
> >
> >
> > > Hi,
> > >
> > >
> > > > If that's the cause, it's probably a double down of the host scan
> > > > semaphore somewhere in the code.  alt-sysrq-t should work in this case,
> > > > can you get a stack trace of the blocked process?
> > >
> > >
> > > It appears to be this patch:
> > >
> > >  [SCSI] SCSI core: fix leakage of scsi_cmnd's
> > >
> > >  From:         Alan Stern <stern@rowland.harvard.edu>
> >
> >
> >
> > > And in particular it looks like the scsi_unprep_request in
> > > scsi_queue_insert is causing it. The following patch fixes the boot
> > > problems on the vscsi machine:
> >
> >
> >
> > In general the scsi_unprep_request routine is correct and needs to be
> > there.  The one part that might be questionable is the assignment to
> > req->special.  It may turn out that the real solution is to have
> > scsi_execute set req->special to NULL; I assumed it would be NULL already
> > but perhaps I was wrong.
>
>
> I think we have scsi_execute and friends setting REQ_SPECIAL. This is 
> could cause a problem becuase it does not have a scsi_request.

well now actually it won't becuase sc_request should be null for those 
scsi_execute block pc commands I think.
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