From: Joerg Roedel <jroedel@suse.de>
Date: Thu, 23 Jul 2015 16:37:13 +0000 (+0200)
Subject: iommu/vt-d: Avoid duplicate device_domain_info structures
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f303e50766298feac17c8715e29ecd14b2c12680;p=linux-beck.git

iommu/vt-d: Avoid duplicate device_domain_info structures

When a 'struct device_domain_info' is created as an alias
for another device, this struct will not be re-used when the
real device is encountered. Fix that to avoid duplicate
device_domain_info structures being added.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6e61b3eb47e8..8834765e90c6 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2270,12 +2270,16 @@ 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);
-	else {
+
+	if (!found) {
 		struct device_domain_info *info2;
 		info2 = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn);
-		if (info2)
-			found = info2->domain;
+		if (info2) {
+			found      = info2->domain;
+			info2->dev = dev;
+		}
 	}
+
 	if (found) {
 		spin_unlock_irqrestore(&device_domain_lock, flags);
 		free_devinfo_mem(info);