linux-kernel - [PATCH 05/23] iommu/amd: Flush the IOMMU TLB before the addresses are freed

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Message-Id: <1450822888-22590-6-git-send-email-joro@8bytes.org>
Date:	Tue, 22 Dec 2015 23:21:10 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, joro@...tes.org, jroedel@...e.de
Subject: [PATCH 05/23] iommu/amd: Flush the IOMMU TLB before the addresses are freed

From: Joerg Roedel <jroedel@...e.de>

This allows to keep the bitmap_lock only for a very short
period of time.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/amd_iommu.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 42c0a81..69021ec 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2527,14 +2527,14 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
 		start += PAGE_SIZE;
 	}
 
-	SUB_STATS_COUNTER(alloced_io_mem, size);
-
-	dma_ops_free_addresses(dma_dom, dma_addr, pages);
-
 	if (amd_iommu_unmap_flush || dma_dom->need_flush) {
 		domain_flush_pages(&dma_dom->domain, flush_addr, size);
 		dma_dom->need_flush = false;
 	}
+
+	SUB_STATS_COUNTER(alloced_io_mem, size);
+
+	dma_ops_free_addresses(dma_dom, dma_addr, pages);
 }
 
 /*
-- 
1.9.1

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