Home » Mailing list archives » linux-kernel » 2010 » October » 20

[PATCHv4 1/4] iovmm: no gap checking for fixed address

Previous thread: [PATCHv4 2/4] iovmm: add superpages support to fixed da address by Fernando Guzman Lugo on Tuesday, October 19, 2010 - 7:48 pm. (12 messages)

Next thread: [PATCHv4 0/4] iovmm: fixes for iovmm module by Fernando Guzman Lugo on Tuesday, October 19, 2010 - 7:48 pm. (1 message)
[view original message]
From: Fernando Guzman Lugo
Subject: [PATCHv4 1/4] iovmm: no gap checking for fixed address
Date: Tuesday, October 19, 2010 - 7:48 pm

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@ti.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

--


[ message continues ]
Previous thread: [PATCHv4 2/4] iovmm: add superpages support to fixed da address by Fernando Guzman Lugo on Tuesday, October 19, 2010 - 7:48 pm. (12 messages)

Next thread: [PATCHv4 0/4] iovmm: fixes for iovmm module by Fernando Guzman Lugo on Tuesday, October 19, 2010 - 7:48 pm. (1 message)