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[PATCH] i386: make pci_map_single/pci_map_sg warn for zero length.

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As suggested by Linus.

This catches driver bugs that could cause corruption on IOMMU architectures.

Also I converted the BUGs to out_of_line_bug()s to save a bit
of text space.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-01-11 22:44:54 +01:00 committed by Linus Torvalds
parent 3d831d925c
commit fd78f11790
1 changed files with 9 additions and 3 deletions
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12
include/asm-i386/dma-mapping.h
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@ -6,6 +6,7 @@
#include <asm/cache.h>
#include <asm/io.h>
#include <asm/scatterlist.h>
#include <asm/bug.h>
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
@ -20,7 +21,9 @@ static inline dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
if (direction == DMA_NONE)
BUG();
WARN_ON(size == 0);
flush_write_buffers();
return virt_to_phys(ptr);
}
@ -29,7 +32,8 @@ static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
if (direction == DMA_NONE)
BUG();
}
static inline int
@ -38,7 +42,9 @@ dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
{
int i;
BUG_ON(direction == DMA_NONE);
if (direction == DMA_NONE)
BUG();
WARN_ON(nents == 0 || sg[0].length == 0);
for (i = 0; i < nents; i++ ) {
BUG_ON(!sg[i].page);