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>
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 @@
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 @@
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);
}