linux-kernel - Re: [PATCH 01/12] libiscsi: Convert to host_lock less w/ interrupts disabled internally

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Message-Id: <1293140023.4649.132.camel@haakon2.linux-iscsi.org>
Date:	Thu, 23 Dec 2010 13:33:43 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Mike Christie <michaelc@...wisc.edu>
Cc:	Boaz Harrosh <bharrosh@...asas.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Jeff Garzik <jeff@...zik.org>, Christoph Hellwig <hch@....de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Mike Anderson <andmike@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>, Vasu Dev <vasu.dev@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Ravi Anand <ravi.anand@...gic.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Joe Eykholt <jeykholt@...co.com>,
	James Smart <james.smart@...lex.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	adam radford <aradford@...il.com>,
	Kashyap Desai <Kashyap.Desai@....com>,
	MPTFusionLinux <DL-MPTFusionLinux@....com>
Subject: Re: [PATCH 01/12] libiscsi: Convert to host_lock less w/
	interrupts disabled internally

On Tue, 2010-12-21 at 17:43 -0600, Mike Christie wrote:
> On 12/21/2010 04:53 AM, Boaz Harrosh wrote:
> > On 12/21/2010 02:42 AM, Mike Christie wrote:
> >> On 12/19/2010 03:21 PM, Nicholas A. Bellinger wrote:
> >>>    prepd_fault:
> >>> @@ -1732,12 +1728,10 @@ fault:
> >>>    		scsi_out(sc)->resid = scsi_out(sc)->length;
> >>>    		scsi_in(sc)->resid = scsi_in(sc)->length;
> >>>    	}
> >>> -	done(sc);
> >>> -	spin_lock(host->host_lock);
> >>> +	sc->scsi_done(sc);
> >>>    	return 0;
> >>
> >>
> >> Did you mean to send this patch or a different one? I think you sent a
> >> patch with this before and I said it was wrong. Did you disagree with
> >> that comment or did you change something else so it now works?
> >
> > Mike hi
> >
> > I think Nick is gone for the holidays. What I understood is that he's
> > waiting for you to fix it. Because he's not sure what the proper solution
> > is. Do you have time to look into it? (It will take you much faster then me)
> >
> 
> I am still working on it for the 2.6.38 feature window.

I was still unsure on the exception path handling concerns you had
mentioned in iscsi_queuecommand() wrt to a NULL pointer deference with
sc->scsi_done() for SCSI_MLQUEUE_TARGET_BUSY.  So at this point I will
again defer to your better judgement and await your patch.

Thanks Mike!

--nab

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