linux-kernel - [PATCH 2/6] iommu/vt-d: move up no_iommu and dmar

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Date:	Tue, 20 May 2014 20:37:48 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH 2/6] iommu/vt-d: move up no_iommu and dmar_disabled check

Move up the no_iommu and dmar_disabled check, avoid the
useless initialization for dmar.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 drivers/iommu/intel-iommu.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index e020dcf..6b71608 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3948,6 +3948,9 @@ int __init intel_iommu_init(void)
 	/* VT-d is required for a TXT/tboot launch, so enforce that */
 	force_on = tboot_force_iommu();
 
+	if (no_iommu || dmar_disabled)
+		return ret;
+
 	if (iommu_init_mempool()) {
 		if (force_on)
 			panic("tboot: Failed to initialize iommu memory\n");
@@ -3974,9 +3977,6 @@ int __init intel_iommu_init(void)
 		goto out_free_dmar;
 	}
 
-	if (no_iommu || dmar_disabled)
-		goto out_free_dmar;
-
 	if (list_empty(&dmar_rmrr_units))
 		printk(KERN_INFO "DMAR: No RMRR found\n");
 
-- 
1.7.1


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