On 1/5/22 12:41 AM, Bjorn Helgaas wrote:
struct group_device {
@@ -289,7 +291,12 @@ int iommu_probe_device(struct device *dev)
mutex_lock(&group->mutex);
iommu_alloc_default_domain(group, dev);
- if (group->default_domain) {
+ /*
+ * If device joined an existing group which has been claimed
+ * for none kernel DMA purpose, avoid attaching the default
+ * domain.
AOL: another "none kernel DMA purpose" that doesn't read well. Is
this supposed to be "non-kernel"? What does "claimed for non-kernel
DMA purpose" mean? What interface does that?
It's hard to read. I will rephrase it like this:
/*
* If device joined an existing group which has been claimed, don't
* attach the default domain.
*/
Best regards,
baolu
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