Re: [PATCH RFC 1/4] xen, blkfront: add support for the multi-queue block layer API

[Christoph Hellwig]

On Fri, Aug 22, 2014 at 01:25:34PM +0100, David Vrabel wrote:
> > +	spin_lock_irq(&info->io_lock);
> 
> Is this lock necessary?  Does the block layer serialise calls to the
> queue_rq op?

Calls to ->queue_rq are not serialized by the block layer.

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