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

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Message-ID: <20140822150307.GB29424@infradead.org>
Date:	Fri, 22 Aug 2014 08:03:07 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Arianna Avanzini <avanzini.arianna@...il.com>,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	bob.liu@...cle.com, felipe.franciosi@...rix.com, axboe@...com
Subject: Re: [PATCH RFC 1/4] xen, blkfront: add support for the multi-queue
 block layer API

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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