linux-kernel - Re: [PATCH v2 08/10] nvme/pci: implement the mdev external queue allocation interface

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Date:   Fri, 3 May 2019 06:09:15 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     "Heitke, Kenneth" <kenneth.heitke@...el.com>,
        linux-nvme@...ts.infradead.org, Fam Zheng <fam@...hon.net>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>, kvm@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Liang Cunming <cunming.liang@...el.com>,
        Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
        Kirti Wankhede <kwankhede@...dia.com>,
        Jens Axboe <axboe@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        John Ferlan <jferlan@...hat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Liu Changpeng <changpeng.liu@...el.com>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        Amnon Ilan <ailan@...hat.com>, Christoph Hellwig <hch@....de>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Subject: Re: [PATCH v2 08/10] nvme/pci: implement the mdev external queue
 allocation interface

On Fri, May 03, 2019 at 12:20:17AM +0300, Maxim Levitsky wrote:
> On Thu, 2019-05-02 at 15:12 -0600, Heitke, Kenneth wrote:
> > On 5/2/2019 5:47 AM, Maxim Levitsky wrote:
> > > +static void nvme_ext_queue_free(struct nvme_ctrl *ctrl, u16 qid)
> > > +{
> > > +	struct nvme_dev *dev = to_nvme_dev(ctrl);
> > > +	struct nvme_queue *nvmeq;
> > > +
> > > +	mutex_lock(&dev->ext_dev_lock);
> > > +	nvmeq = &dev->queues[qid];
> > > +
> > > +	if (WARN_ON(!test_bit(NVMEQ_EXTERNAL, &nvmeq->flags)))
> > > +		return;
> > 
> > This condition is probably not expected to happen (since its a warning)
> > but do you need to unlock the ext_dev_lock before returning?
> 
> This is true, I will fix this. This used to be BUG_ON, but due to checkpatch.pl
> complains I turned them all to WARN_ON, and missed this.

Gentle reminder to trim your replies to the relevant context. It's
much easier to read when we don't need to scroll through hundreds of
unnecessary lines.