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

[Jens Axboe <jens.axboe@oracle.com>]

On Mon, Apr 14 2008, scameron@beardog.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