linux-kernel - Re: [PATCH 2/2]: PCI Error Recovery: Symbios SCSI First Failure

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Message-ID: <20071001224132.GH4338@austin.ibm.com>
Date:	Mon, 1 Oct 2007 17:41:32 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-scsi@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: [PATCH 2/2]: PCI Error Recovery: Symbios SCSI First Failure

On Mon, Oct 01, 2007 at 02:12:47PM -0600, Matthew Wilcox wrote:
> 
> I think the fundamental problem is that completions aren't really
> supposed to be used like this.  Here's one attempt at using completions
> perhaps a little more the way they're supposed to be used, 

Yes, that looks very good to me.  I see it solves a bug that
I hadn't been quite aware of. I don't understand why 
struct host_data is preferable to struct sym_shcb (is it because 
this is the structure that is "naturally protectected" by the 
spinlock?)

My gut instinct is to say "ack", although prudence dictates that 
I should test first. Which might take a few days...

> although now
> I've written it, I wonder if we shouldn't just use a waitqueue instead.

I thought that earlier versions of the driver used waitqueues (I vaguely
remember "eh_wait" in the code), which were later converted to 
completions (I also vaguely recall thinking that the new code was
more elegant/simpler). I converted my patch to use the completions 
likewise, and, as you've clearly shown, did a rather sloppy job in 
the conversion.

I'm tempted to go with this patch; but if you prod, I could attempt
a wait-queue based patch.

--linas

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