[PATCH V4 mlx5-next 08/13] vfio/pci_core: Make the region->release() function optional

Yishai Hadas
2021-10-26T09:07:59Z

Make the region->release() function optional as in some cases there is
nothing to do by driver as part of it.

This is needed for coming patch from this series once we add
mlx5_vfio_pci driver to support live migration but we don't need a
migration release function.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
drivers/vfio/pci/vfio_pci_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index a03b5a99c2da..e581a327f90d 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -341,7 +341,8 @@ void vfio_pci_core_disable(struct vfio_pci_core_device *vdev)
vdev->virq_disabled = false;

for (i = 0; i < vdev->num_regions; i++)
- vdev->region[i].ops->release(vdev, &vdev->region[i]);
+ if (vdev->region[i].ops->release)
+ vdev->region[i].ops->release(vdev, &vdev->region[i]);

vdev->num_regions = 0;
kfree(vdev->region);
--
2.18.1