Re: [RFC] How to fix an async scan - rmmod race?

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On 04/06/12 16:35, James Bottomley wrote:

> On Fri, 2012-04-06 at 16:15 +0000, Bart Van Assche wrote:
>> As far as I can see the queuecommand call in scsi_dispatch_cmd() can
>> race with module removal - that call can be triggered while the host
>> template is being unloaded. I'm not sure though what the best approach
>> is to fix that race.
> Um, it's a bit hard to see how.  It's not really possible to trigger
> queuecommand except in the initial probe without an open device ... and
> opening the device holds the module.

Sorry, but I forgot to mention that it's not just scsi_dispatch_cmd()
that invokes queuecommand via the host template. The SCSI error handler
does that too. As far as I can see there is no protection in the SCSI
error handler against LLD module removal. But maybe I overlooked something.

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