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SubjectRE: [PATCH v3 03/10] vfio_pci: refine vfio_pci_driver reference in vfio_pci.c
Date
> From: Alex Williamson < alex.williamson@redhat.com>
> Sent: Monday, December 16, 2019 6:47 AM
> To: Liu, Yi L <yi.l.liu@intel.com>
> Subject: Re: [PATCH v3 03/10] vfio_pci: refine vfio_pci_driver reference in vfio_pci.c
>
> On Thu, 21 Nov 2019 19:23:40 +0800
> Liu Yi L <yi.l.liu@intel.com> wrote:
>
> > This patch replaces the vfio_pci_driver reference in vfio_pci.c with
> > pci_dev_driver(vdev->pdev) which is more helpful to make the functions
> > be generic to module types.
> >
> > Cc: Kevin Tian <kevin.tian@intel.com>
> > Cc: Lu Baolu <baolu.lu@linux.intel.com>
> > Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> > ---
> > drivers/vfio/pci/vfio_pci.c | 33 ++++++++++++++++++---------------
> > 1 file changed, 18 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> > index b04e43a..2096e66 100644
> > --- a/drivers/vfio/pci/vfio_pci.c
> > +++ b/drivers/vfio/pci/vfio_pci.c
> > @@ -1460,24 +1460,25 @@ static void vfio_pci_reflck_get(struct vfio_pci_reflck
> *reflck)
> >
> > static int vfio_pci_reflck_find(struct pci_dev *pdev, void *data)
> > {
> > - struct vfio_pci_reflck **preflck = data;
> > + struct vfio_pci_device *vdev = data;
> > + struct vfio_pci_reflck **preflck = &vdev->reflck;
> > struct vfio_device *device;
> > - struct vfio_pci_device *vdev;
> > + struct vfio_pci_device *tmp;
> >
> > device = vfio_device_get_from_dev(&pdev->dev);
> > if (!device)
> > return 0;
> >
> > - if (pci_dev_driver(pdev) != &vfio_pci_driver) {
> > + if (pci_dev_driver(pdev) != pci_dev_driver(vdev->pdev)) {
> > vfio_device_put(device);
> > return 0;
> > }
> >
> > - vdev = vfio_device_data(device);
> > + tmp = vfio_device_data(device);
> >
> > - if (vdev->reflck) {
> > - vfio_pci_reflck_get(vdev->reflck);
> > - *preflck = vdev->reflck;
> > + if (tmp->reflck) {
> > + vfio_pci_reflck_get(tmp->reflck);
> > + *preflck = tmp->reflck;
> > vfio_device_put(device);
> > return 1;
> > }
> > @@ -1494,7 +1495,7 @@ static int vfio_pci_reflck_attach(struct vfio_pci_device
> *vdev)
> >
> > if (pci_is_root_bus(vdev->pdev->bus) ||
> > vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_reflck_find,
> > - &vdev->reflck, slot) <= 0)
> > + vdev, slot) <= 0)
> > vdev->reflck = vfio_pci_reflck_alloc();
> >
> > mutex_unlock(&reflck_lock);
> > @@ -1519,6 +1520,7 @@ static void vfio_pci_reflck_put(struct vfio_pci_reflck
> *reflck)
> >
> > struct vfio_devices {
> > struct vfio_device **devices;
> > + struct vfio_pci_device *vdev;
> > int cur_index;
> > int max_index;
> > };
> > @@ -1527,7 +1529,7 @@ static int vfio_pci_get_unused_devs(struct pci_dev
> *pdev, void *data)
> > {
> > struct vfio_devices *devs = data;
> > struct vfio_device *device;
> > - struct vfio_pci_device *vdev;
> > + struct vfio_pci_device *tmp;
> >
> > if (devs->cur_index == devs->max_index)
> > return -ENOSPC;
> > @@ -1536,15 +1538,15 @@ static int vfio_pci_get_unused_devs(struct pci_dev
> *pdev, void *data)
> > if (!device)
> > return -EINVAL;
> >
> > - if (pci_dev_driver(pdev) != &vfio_pci_driver) {
> > + if (pci_dev_driver(pdev) != pci_dev_driver(devs->vdev->pdev)) {
> > vfio_device_put(device);
> > return -EBUSY;
> > }
> >
> > - vdev = vfio_device_data(device);
> > + tmp = vfio_device_data(device);
> >
> > /* Fault if the device is not unused */
> > - if (vdev->refcnt) {
> > + if (tmp->refcnt) {
> > vfio_device_put(device);
> > return -EBUSY;
> > }
> > @@ -1590,6 +1592,7 @@ static void vfio_pci_try_bus_reset(struct vfio_pci_device
> *vdev)
> > if (!devs.devices)
> > return;
> >
> > + devs.vdev = vdev;
>
> This could be added to the declaration initializer:
>
> struct vfio_devices devs = { .vdev = vdev, .cur_index = 0 };
>
> It might seem a little less random then. Thanks,

Got it. Will do it.

Thanks,
Yi Liu

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