linux-kernel - Re: 2.6.23-rc8-mm2: OOPS in mmc on boot

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Message-ID: <20071004124602.2be94bfe@poseidon.drzeus.cx>
Date:	Thu, 4 Oct 2007 12:46:02 +0200
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Don Mullis <dwm@...r.net>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc8-mm2: OOPS in mmc on boot

On Thu, 4 Oct 2007 12:38:05 +0200
Jens Axboe <jens.axboe@...cle.com> wrote:

> On Thu, Oct 04 2007, Pierre Ossman wrote:
> > 
> > Is that a yes or a no? You said that the ->page field was involved
> > in
> 
> It's a conditional yes, re-read it :-)
> 

I didn't get the memo about what chained sg entries entail.

> > list chaining, so does or doesn't it have to be initialized before a
> > call to sg_init_one()?
> 
> That's not the problem. It has to be initialized before calling
> blk_rq_map_sg(). sg_init_one() will zero the entire sg entry, and that
> breaks if that particular sg entry is part of a larger sg table AND
> that sg entry happens to be the chain element.
> 

Ok, then it shouldn't affect my world at least.

Rgds
Pierre

PS. Did someone forget to do a review of all blk_rq_map_sg() callers
before committing the chained list stuff? ;)

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