linux-kernel - [PATCH 05/19] AMD IOMMU: add domain id free function

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Date:	Thu, 4 Dec 2008 18:31:42 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	avi@...hat.com, mingo@...hat.com, dwmw2@...radead.org,
	gregkh@...e.de, weidong.han@...el.com
CC:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 05/19] AMD IOMMU: add domain id free function

Impact: add code to release a domain id

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index bec34fd..b774638 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -568,6 +568,16 @@ static u16 domain_id_alloc(void)
 	return id;
 }
 
+static void domain_id_free(int id)
+{
+	unsigned long flags;
+
+	write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+	if (id > 0 && id < MAX_DOMAIN_ID)
+		__clear_bit(id, amd_iommu_pd_alloc_bitmap);
+	write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+}
+
 /*
  * Used to reserve address ranges in the aperture (e.g. for exclusion
  * ranges.
-- 
1.5.6.4


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