linux-kernel - Re: [patch] cciss: Fix problem that deleting multiple logical drives could cause a panic

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Message-ID: <20081218135720.GR32491@kernel.dk>
Date:	Thu, 18 Dec 2008 14:57:21 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	scameron@...rdog.cca.cpqcorp.net
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mikem@...dking.cca.cpqcorp.net
Subject: Re: [patch] cciss: Fix problem that deleting multiple logical drives could cause a panic

On Tue, Dec 16 2008, scameron@...rdog.cca.cpqcorp.net wrote:
> On Tue, Dec 16, 2008 at 09:27:30PM +0100, Jens Axboe wrote:
> > On Tue, Dec 16 2008, scameron@...rdog.cca.cpqcorp.net wrote:
> > > 
> > > Fix problem that deleting multiple logical drives could cause a panic.
> > 
> > This looks like a 2.6.28 candidate, correct?
> 
> Yes, and we would like to get it in anywhere else it needs to go
> (backport to 2.6.27.x? if that makes sense.)
> 
> It fixes a panic which can be easily reproduced in the following
> way: Just create several "arrays," each with multiple logical 
> drives via hpacucli, then delete the first array, and it will blow
> up in deregister_disk(), in the call to get_host() when it tries to
> dig the hba pointer out of a NULL queue pointer.
> 
> The problem has been present since my code to make 
> rebuild_lun_table behave better went in.

OK, I'll make sure it goes upstream for 2.6.28. I've merged your other
cciss patch for 2.6.29.

-- 
Jens Axboe

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