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| author | Joerg Roedel <joerg.roedel@amd.com> | 2009-03-23 15:35:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-24 08:39:32 +0100 |
| commit | 9537a48ed4b9e4b738943d6da0a0fd4278adf905 (patch) | |
| tree | 06f512876680265ece3bd46b14c2b1c234202918 /lib/dma-debug.c | |
| parent | 35d40952dba7b0689a16bd1463fb7698f8dbe639 (diff) | |
| download | lwn-9537a48ed4b9e4b738943d6da0a0fd4278adf905.tar.gz lwn-9537a48ed4b9e4b738943d6da0a0fd4278adf905.zip | |
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@lab.ntt.co.jp>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
LKML-Reference: <1237818908-26516-1-git-send-email-joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/dma-debug.c')
| -rw-r--r-- | 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 f9e6d38b4b34..1a992089486c 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); } |