From: Joerg Roedel <joerg.roedel@amd.com>
Date: Mon, 17 Nov 2008 18:11:46 +0000 (+0100)
Subject: AMD IOMMU: check for next_bit also in unmapped area
X-Git-Tag: firefly_0821_release~16609^2~21^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8501c45cc32c311ae755a2d5ac8c4a5f04908d42;p=firefly-linux-kernel-4.4.55.git

AMD IOMMU: check for next_bit also in unmapped area

Impact: fix possible use of stale IO/TLB entries

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 331b318304eb..e4899e0e8787 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -537,7 +537,7 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
 	address >>= PAGE_SHIFT;
 	iommu_area_free(dom->bitmap, address, pages);
 
-	if (address + pages >= dom->next_bit)
+	if (address >= dom->next_bit)
 		dom->need_flush = true;
 }