linux-kernel - RE: [PATCH 1/1] iommu/vt-d: Fix RID2PASID setup failure

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Message-ID: <BN9PR11MB52764F60972DF52EEF945D408CB39@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 21 Jun 2022 02:54:36 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Raj, Ashok" <ashok.raj@...el.com>
CC:     "Qiang, Chenyi" <chenyi.qiang@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 1/1] iommu/vt-d: Fix RID2PASID setup failure

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, June 20, 2022 4:17 PM
> @@ -2564,7 +2564,7 @@ static int domain_add_dev_info(struct
> dmar_domain *domain, struct device *dev)
>  			ret = intel_pasid_setup_second_level(iommu,
> domain,
>  					dev, PASID_RID2PASID);
>  		spin_unlock_irqrestore(&iommu->lock, flags);
> -		if (ret) {
> +		if (ret && ret != -EBUSY) {
>  			dev_err(dev, "Setup RID2PASID failed\n");
>  			dmar_remove_one_dev_info(dev);
>  			return ret;
> --
> 2.25.1

It's cleaner to avoid this error at the first place, i.e. only do the
setup when the first device is attached to the pasid table.