Re: [PATCH 1/1] iommu: Fix deferred domain attachment in iommu_probe_device()

[Joerg Roedel]

Hi Baolu,

On Mon, Oct 26, 2020 at 02:30:08PM +0800, Lu Baolu wrote:
> @@ -264,7 +266,8 @@ int iommu_probe_device(struct device *dev)
>  	 */
>  	iommu_alloc_default_domain(group, dev);
>  
> -	if (group->default_domain)
> +	if (group->default_domain &&
> +	    !iommu_is_attach_deferred(group->default_domain, dev))
>  		ret = __iommu_attach_device(group->default_domain, dev);

This is the hotplug path, not used for boot-initialization. Have you
seen failures from the missing check here?

Regards,

	Joerg