linux-kernel - [PATCH] iommu: fix end address of vm area comparation in alloc_iovm

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Date:	Mon, 16 Aug 2010 22:51:53 -0500
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"Hiroshi.DOYO@...ia.com" <Hiroshi.DOYO@...ia.com>,
	"Kanigeri, Hari" <h-kanigeri2@...com>
Subject: [PATCH] iommu: fix end address of vm area comparation in
 alloc_iovm_area

>From cc48c0adaee97c8385a356aefa5b64a51818b4fd Mon Sep 17 00:00:00 2001
From: Fernando Guzman Lugo <x0095840@...com>
Date: Mon, 16 Aug 2010 22:28:24 -0500
Subject: [PATCH] iommu: fix end address of vm area comparation in alloc_iovm_area

End address of the vm area is “start + bytes -1”,
not “start + byte”. This patch fixes that issue by doing
an inclusive comparison with tmp->da_start. This issue
was preventing allocate an area of size exactly the same
than the free area. I did no change the value of da_end
of each vm area because it is used to get area size in
several places.

Signed-off-by: Fernando Guzman Lugo <x0095840@...com>
---
 arch/arm/plat-omap/iovmm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
index b8bcad5..8745d4e 100644
--- a/arch/arm/plat-omap/iovmm.c
+++ b/arch/arm/plat-omap/iovmm.c
@@ -295,7 +295,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
 	prev_end = 0;
 	list_for_each_entry(tmp, &obj->mmap, list) {
 
-		if ((prev_end <= start) && (start + bytes < tmp->da_start))
+		if ((prev_end <= start) && (start + bytes <= tmp->da_start))
 			goto found;
 
 		if (flags & IOVMF_DA_ANON)
-- 
1.7.0.4
--
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