linux-kernel - [PATCH 1/4] amd_iommu: fix lock imbalance

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Date:	Tue, 9 Jun 2009 15:57:17 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 1/4] amd_iommu: fix lock imbalance

From: Jiri Slaby <jirislaby@...il.com>

In alloc_coherent there is an omitted unlock on the path where mapping
fails. Add the unlock.

[ Impact: fix lock imbalance in alloc_coherent ]

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Cc: Joerg Roedel <joerg.roedel@....com>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index d689883..9f89bb6 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1541,8 +1541,10 @@ static void *alloc_coherent(struct device *dev, size_t size,
 	*dma_addr = __map_single(dev, iommu, domain->priv, paddr,
 				 size, DMA_BIDIRECTIONAL, true, dma_mask);
 
-	if (*dma_addr == bad_dma_address)
+	if (*dma_addr == bad_dma_address) {
+		spin_unlock_irqrestore(&domain->lock, flags);
 		goto out_free;
+	}
 
 	iommu_completion_wait(iommu);
 
-- 
1.6.3.1


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