linux-kernel - Re: [PATCH v1 09/10] iommu/vt-d: Refactor dmar_insert_one_dev

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Message-ID: <20220207102725.3ce9320d@jacob-builder>
Date:   Mon, 7 Feb 2022 10:27:25 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Liu Yi L <yi.l.liu@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@....de>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v1 09/10] iommu/vt-d: Refactor
 dmar_insert_one_dev_info()

Hi BaoLu,

On Mon,  7 Feb 2022 14:41:41 +0800, Lu Baolu <baolu.lu@...ux.intel.com>
wrote:

>  static void intel_iommu_release_device(struct device *dev)
>  {
> -	struct intel_iommu *iommu;
> -
> -	iommu = device_to_iommu(dev, NULL, NULL);
> -	if (!iommu)
> -		return;
> -
> -	dmar_remove_one_dev_info(dev);
> +	struct device_domain_info *info = get_domain_info(dev);
> +	unsigned long index = DEVI_IDX(info->segment, info->bus,
> info->devfn); 
> +	xa_erase(&device_domain_array, index);
> +	dev_iommu_priv_set(info->dev, NULL);
>  	set_dma_ops(dev, NULL);
> +	kfree(info);
Now that info and sinfo are under RCU, should we use kfree_rcu?

Thanks,

Jacob