From f81e477e92da0b07d5bb7310d37d342243bd524a Mon Sep 17 00:00:00 2001
From: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Tue, 23 Aug 2011 17:05:19 -0700
Subject: [PATCH] --- yaml --- r: 268901 b: refs/heads/master c:
 c2c7286ac6d996a8ffc8d391d782ba35570b1236 h: refs/heads/master i:   268899:
 dc0045e31954e5224de7fb107ebb8cbc6e133086 v: v3

---
 [refs]                               |  2 +-
 trunk/drivers/iommu/dmar.c           | 15 ++++++++++++---
 trunk/drivers/iommu/intel-iommu.c    |  6 +-----
 trunk/drivers/iommu/intr_remapping.c |  9 +++++++++
 4 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/[refs] b/[refs]
index 0718417dc44b..19677880d0bd 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 41750d31fc9599fd81763e685a6b7b42d298c4f8
+refs/heads/master: c2c7286ac6d996a8ffc8d391d782ba35570b1236
diff --git a/trunk/drivers/iommu/dmar.c b/trunk/drivers/iommu/dmar.c
index c4a0235a4fdb..17adf1ebcb13 100644
--- a/trunk/drivers/iommu/dmar.c
+++ b/trunk/drivers/iommu/dmar.c
@@ -557,13 +557,17 @@ dmar_find_matched_drhd_unit(struct pci_dev *dev)
 
 int __init dmar_dev_scope_init(void)
 {
+	static int dmar_dev_scope_initialized;
 	struct dmar_drhd_unit *drhd, *drhd_n;
 	int ret = -ENODEV;
 
+	if (dmar_dev_scope_initialized)
+		return dmar_dev_scope_initialized;
+
 	list_for_each_entry_safe(drhd, drhd_n, &dmar_drhd_units, list) {
 		ret = dmar_parse_dev(drhd);
 		if (ret)
-			return ret;
+			goto fail;
 	}
 
 #ifdef CONFIG_DMAR
@@ -574,17 +578,22 @@ int __init dmar_dev_scope_init(void)
 		list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) {
 			ret = rmrr_parse_dev(rmrr);
 			if (ret)
-				return ret;
+				goto fail;
 		}
 
 		list_for_each_entry_safe(atsr, atsr_n, &dmar_atsr_units, list) {
 			ret = atsr_parse_dev(atsr);
 			if (ret)
-				return ret;
+				goto fail;
 		}
 	}
 #endif
 
+	dmar_dev_scope_initialized = 1;
+	return 0;
+
+fail:
+	dmar_dev_scope_initialized = ret;
 	return ret;
 }
 
diff --git a/trunk/drivers/iommu/intel-iommu.c b/trunk/drivers/iommu/intel-iommu.c
index c621c98c99da..df69618177c5 100644
--- a/trunk/drivers/iommu/intel-iommu.c
+++ b/trunk/drivers/iommu/intel-iommu.c
@@ -3439,16 +3439,12 @@ int __init intel_iommu_init(void)
 		return 	-ENODEV;
 	}
 
-	if (dmar_dev_scope_init()) {
+	if (dmar_dev_scope_init() < 0) {
 		if (force_on)
 			panic("tboot: Failed to initialize DMAR device scope\n");
 		return 	-ENODEV;
 	}
 
-	/*
-	 * Check the need for DMA-remapping initialization now.
-	 * Above initialization will also be used by Interrupt-remapping.
-	 */
 	if (no_iommu || dmar_disabled)
 		return -ENODEV;
 
diff --git a/trunk/drivers/iommu/intr_remapping.c b/trunk/drivers/iommu/intr_remapping.c
index 51a2ce9b8789..cfb0dd4bf0b6 100644
--- a/trunk/drivers/iommu/intr_remapping.c
+++ b/trunk/drivers/iommu/intr_remapping.c
@@ -773,6 +773,15 @@ int __init parse_ioapics_under_ir(void)
 	return ir_supported;
 }
 
+int ir_dev_scope_init(void)
+{
+	if (!intr_remapping_enabled)
+		return 0;
+
+	return dmar_dev_scope_init();
+}
+rootfs_initcall(ir_dev_scope_init);
+
 void disable_intr_remapping(void)
 {
 	struct dmar_drhd_unit *drhd;