Re: [PATCH v4 05/13] iommu/vt-d: Prepare intel_iommu_set_dev_pasid() handle replacement

[Baolu Lu <baolu.lu@linux.intel.com>]

On 2024/11/6 16:02, Yi Liu wrote:
>>> @@ -4329,24 +4368,17 @@ static int intel_iommu_set_dev_pasid(struct
>>> iommu_domain *domain,
>>>           ret = intel_pasid_setup_second_level(iommu, dmar_domain,
>>>                                dev, pasid);
>>>       if (ret)
>>> -        goto out_unassign_tag;
>>> +        goto out_remove_dev_pasid;
>>>
>>> -    dev_pasid->dev = dev;
>>> -    dev_pasid->pasid = pasid;
>>> -    spin_lock_irqsave(&dmar_domain->lock, flags);
>>> -    list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
>>> -    spin_unlock_irqrestore(&dmar_domain->lock, flags);
>>> +    domain_remove_dev_pasid(old, dev, pasid);
>>
>> My preference is moving the check of non-NULL old out here.
> 
> @Baolu, how about your thought?

If we move the check out of this helper, there will be boilerplate code
in multiple places. Something like,

	if (old)
		domain_remove_dev_pasid(old, dev, pasid);

--
baolu