Commit fd78f117 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

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



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: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 3d831d92
......@@ -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);
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment