linux-kernel - [PATCH 08/10] iommu/amd: Do not update the information of domain to devtables before device driver init

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Date:	Thu, 24 Sep 2015 14:37:34 +0800
From:	Baoquan He <bhe@...hat.com>
To:	joro@...tes.org, iommu@...ts.linux-foundation.org
Cc:	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH 08/10] iommu/amd: Do not update the information of domain to devtables before device driver init

update_domain() is the only place where domain->pt_root will be got and
set into dev entry. So before the device driver initialization we do
nothing if it's in previously enabled translation status.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 drivers/iommu/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 0d59f79..aee1ae4 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2350,7 +2350,7 @@ static void update_device_table(struct protection_domain *domain)
 
 static void update_domain(struct protection_domain *domain)
 {
-	if (!domain->updated)
+	if (!domain->updated || translation_pre_enabled())
 		return;
 
 	update_device_table(domain);
-- 
2.4.0

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