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

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Message-ID: <20071004105930.GC5711@kernel.dk>
Date:	Thu, 4 Oct 2007 12:59:30 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Pierre Ossman <drzeus@...eus.cx>
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, Oct 04 2007, Pierre Ossman wrote:
> 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.

It's been posted here several times, but that's ok and it should not
matter. I just can't answer your question with a clear yes or no, since
it depends on certain situations.

> > > 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.

No, I think mmc is fine, it just needed that memset.

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

Apparently this one got missed (and cciss), I'll do a new look just to
be on the safe side.

-- 
Jens Axboe

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