linux-kernel - Re: [PATCH 3/3] vfio/pci: Add ioeventfd support

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Date:   Thu, 15 Mar 2018 15:12:33 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        qemu-devel@...gnu.org, eric.auger@...hat.com, aik@...abs.ru
Subject: Re: [PATCH 3/3] vfio/pci: Add ioeventfd support

On Wed, 7 Mar 2018 13:56:44 +0800
Peter Xu <peterx@...hat.com> wrote:

> On Wed, Feb 28, 2018 at 01:15:20PM -0700, Alex Williamson wrote:
> 
> [...]
> 
> > @@ -1174,6 +1206,8 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> >  	vdev->irq_type = VFIO_PCI_NUM_IRQS;
> >  	mutex_init(&vdev->igate);
> >  	spin_lock_init(&vdev->irqlock);
> > +	mutex_init(&vdev->ioeventfds_lock);  
> 
> Do we better need to destroy the mutex in vfio_pci_remove?
> 
> I see that vfio_pci_device.igate is also without a destructor.  I'm
> not sure on both.

Yeah, mutex_destroy() is purely for debugging and I must have missed it
when implementing vfio.  I'll add it in the remove function and try to
cleanup the others in a separate patch, at some point.  Thanks,

Alex