linux-kernel - [tip:core/iommu] dma-debug: make memory range checks more consistent

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Date:	Tue, 24 Mar 2009 07:42:26 GMT
From:	Joerg Roedel <joerg.roedel@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	joerg.roedel@....com, fujita.tomonori@....ntt.co.jp,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/iommu] dma-debug: make memory range checks more consistent

Commit-ID:  9537a48ed4b9e4b738943d6da0a0fd4278adf905
Gitweb:     http://git.kernel.org/tip/9537a48ed4b9e4b738943d6da0a0fd4278adf905
Author:     Joerg Roedel <joerg.roedel@....com>
AuthorDate: Mon, 23 Mar 2009 15:35:08 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 24 Mar 2009 08:39:32 +0100

dma-debug: make memory range checks more consistent

Impact: extend on-kernel-stack DMA debug checks to all !highmem pages

We only checked dma_map_single() - extend it to dma_map_page()
and dma_map_sg() as well.

Also, fix dma_map_single() corner case bug: make sure we dont
stack-check highmem (not mapped) pages.

Reported-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
Cc: iommu@...ts.linux-foundation.org
LKML-Reference: <1237818908-26516-1-git-send-email-joerg.roedel@....com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 lib/dma-debug.c |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index f9e6d38..1a99208 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -722,10 +722,11 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
 	entry->size      = size;
 	entry->direction = direction;
 
-	if (map_single) {
-		void *addr = ((char *)page_address(page)) + offset;
-
+	if (map_single)
 		entry->type = dma_debug_single;
+
+	if (!PageHighMem(page)) {
+		void *addr = ((char *)page_address(page)) + offset;
 		check_for_stack(dev, addr);
 		check_for_illegal_area(dev, addr, size);
 	}
@@ -779,8 +780,10 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
 		entry->sg_call_ents   = nents;
 		entry->sg_mapped_ents = mapped_ents;
 
-		check_for_stack(dev, sg_virt(s));
-		check_for_illegal_area(dev, sg_virt(s), s->length);
+		if (!PageHighMem(sg_page(s))) {
+			check_for_stack(dev, sg_virt(s));
+			check_for_illegal_area(dev, sg_virt(s), s->length);
+		}
 
 		add_dma_entry(entry);
 	}
--
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