linux-kernel - Re: [PATCH 1/1] iommu: Fix deferred domain attachment in iommu_probe

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Date:   Tue, 3 Nov 2020 14:23:58 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu: Fix deferred domain attachment in
 iommu_probe_device()

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