[PATCH v2 1/2] iommu: add support for drivers that manage iommu explicitly

Joerg Roedel joro at 8bytes.org
Tue Sep 10 08:14:15 UTC 2019

On Fri, Sep 06, 2019 at 02:44:01PM -0700, Rob Clark wrote:
> @@ -674,7 +674,7 @@ int iommu_group_add_device(struct iommu_group *group, struct device *dev)
>  	mutex_lock(&group->mutex);
>  	list_add_tail(&device->list, &group->devices);
> -	if (group->domain)
> +	if (group->domain && !(dev->driver && dev->driver->driver_manages_iommu))

Hmm, this code usually runs at enumeration time when no driver is
attached to the device. Actually it would be pretty dangerous when this
code runs while a driver is attached to the device. How does that change
make things work for you?



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