On 5/20/23 2:42 AM, Jason Gunthorpe wrote:
Remove the race where a hotplug of a device into an existing group will have the device installed in the group->devices, but not yet attached to the group's current domain. Move the group attachment logic from iommu_probe_device() and put it under the same mutex that updates the group->devices list so everything is atomic under the lock. We retain the two step setup of the default domain for the bus_iommu_probe() case solely so that we have a more complete view of the group when creating the default domain for boot time devices. This is not generally necessary with the current code structure but seems to be supporting some odd corner cases like alias RID's and IOMMU_RESV_DIRECT or driver bugs returning different default_domain types for the same group. During bus_iommu_probe() the group will have a device list but both group->default_domain and group->domain will be NULL. Signed-off-by: Jason Gunthorpe<jgg@xxxxxxxxxx>
Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> Best regards, baolu
