linux-kernel - [PATCH 1/4] iovmm: no gap checking for fixed address

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Message-Id: <1287023257-30951-2-git-send-email-x0095840@ti.com>
Date:	Wed, 13 Oct 2010 21:27:34 -0500
From:	Fernando Guzman Lugo <x0095840@...com>
To:	<Hiroshi.DOYU@...ia.com>
Cc:	<felipe.contreras@...ia.com>, <tony@...mide.com>,
	<linux-kernel@...r.kernel.org>, <andy.shevchenko@...il.com>,
	<linux-omap@...r.kernel.org>,
	Fernando Guzman Lugo <x0095840@...com>
Subject: [PATCH 1/4] iovmm: no gap checking for fixed address

If some fixed da address is wanted to be mapped and the page
is freed but it is used as gap, the mapping will fail.
This patch is fixing that and olny keeps the gap for
not fixed address.

Signed-off-by: Fernando Guzman Lugo <x0095840@...com>
---
 arch/arm/plat-omap/iovmm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
index 24ca9c4..34f0012 100644
--- a/arch/arm/plat-omap/iovmm.c
+++ b/arch/arm/plat-omap/iovmm.c
@@ -289,7 +289,7 @@ 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)
+		if (prev_end > start)
 			break;
 
 		if (start + bytes <= tmp->da_start)
@@ -301,7 +301,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
 		prev_end = tmp->da_end;
 	}
 
-	if ((start > prev_end) && (ULONG_MAX - start >= bytes))
+	if ((start >= prev_end) && (ULONG_MAX - start + 1 >= bytes))
 		goto found;
 
 	dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n",
-- 
1.6.3.3

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