linux-kernel - Re: [patch] cciss: Fix race between disk-adding code and interrupt handler

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Message-ID: <20080414170505.GO12774@kernel.dk>
Date:	Mon, 14 Apr 2008 19:05:05 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	scameron@...rdog.cca.cpqcorp.net
Cc:	linux-kernel@...r.kernel.org, mike.miller@...com,
	mikem@...rdog.cca.cpqcorp.net
Subject: Re: [patch] cciss: Fix race between disk-adding code and interrupt handler

On Mon, Apr 14 2008, scameron@...rdog.cca.cpqcorp.net wrote:
> 
> 
> Fix race condition between cciss_init_one(), cciss_update_drive_info(),
> and cciss_check_queues().  cciss_softirq_done would try to start
> queues which were not quite ready to be started, as its checks for
> readiness were not sufficiently synchronized with the queue initializing
> code in cciss_init_one and cciss_update_drive_info.  Slow cpu and
> large numbers of logical drives seem to make the race more likely 
> to cause a problem.

Hmm, this seems backwards to me.  cciss_softirq_done() isn't going to
start the queues, until an irq has triggered for instance. Why isn't the
init properly ordered instead of band-aiding around this with a
'queue_ready' variable?

-- 
Jens Axboe

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