RE: [PATCH v2 06/13] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper

From: Nicolin Chen nicolinc@nvidia.com Sent: Wednesday, December 4, 2024 6:10 AM

+/* Return 0 if device is not associated to the vIOMMU */ +unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,

• 			 struct device *dev)
  

+{

• struct iommufd_vdevice *vdev;
• unsigned long vdev_id = 0;
• unsigned long index;
• xa_lock(&viommu->vdevs);
• xa_for_each(&viommu->vdevs, index, vdev) {

• if (vdev && vdev->dev == dev)
  

xa_for_each only find valid entries, so if (vdev) is redundant?

• 	vdev_id = (unsigned long)vdev->id;
  

break out of the loop if hit.

• }
• xa_unlock(&viommu->vdevs);
• return vdev_id;

+} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_get_vdev_id, IOMMUFD);

MODULE_DESCRIPTION("iommufd code shared with builtin modules"); MODULE_LICENSE("GPL"); -- 2.43.0