linux-kernel - [PATCH v1 03/10] iommu/vt-d: Remove finding domain in dmar_insert_one_dev

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Date:   Mon,  7 Feb 2022 14:41:35 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     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>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@....de>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v1 03/10] iommu/vt-d: Remove finding domain in dmar_insert_one_dev_info()

The Intel IOMMU driver has already converted to use default domain
framework in iommu core. There's no need to find a domain for the
device in the domain attaching path. Cleanup that code.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 438da5da301d..583ec0fa4ac1 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2521,7 +2521,6 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 						    struct device *dev,
 						    struct dmar_domain *domain)
 {
-	struct dmar_domain *found = NULL;
 	struct device_domain_info *info;
 	unsigned long flags;
 	int ret;
@@ -2572,26 +2571,6 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 	}
 
 	spin_lock_irqsave(&device_domain_lock, flags);
-	if (dev)
-		found = find_domain(dev);
-
-	if (!found) {
-		struct device_domain_info *info2;
-		info2 = dmar_search_domain_by_dev_info(info->segment, info->bus,
-						       info->devfn);
-		if (info2) {
-			found      = info2->domain;
-			info2->dev = dev;
-		}
-	}
-
-	if (found) {
-		spin_unlock_irqrestore(&device_domain_lock, flags);
-		free_devinfo_mem(info);
-		/* Caller must free the original domain */
-		return found;
-	}
-
 	spin_lock(&iommu->lock);
 	ret = domain_attach_iommu(domain, iommu);
 	spin_unlock(&iommu->lock);
-- 
2.25.1