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| author | Andi Kleen <ak@suse.de> | 2006-01-11 21:44:54 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-12 03:04:56 (GMT) |
| commit | fd78f11790c37e2165733699f50450500e63a7b3 (patch) | |
| tree | b51d2d6d4b1f83c276d81a72d4522ec701aa4354 /include/asm-i386/dma-mapping.h | |
| parent | 3d831d925c6d66569a0c7f6f5f17c0927f7d3d25 (diff) | |
| download | linux-fsl-qoriq-fd78f11790c37e2165733699f50450500e63a7b3.tar.xz | |
[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: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386/dma-mapping.h')
| -rw-r--r-- | include/asm-i386/dma-mapping.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/include/asm-i386/dma-mapping.h b/include/asm-i386/dma-mapping.h index 6c37a9a..9cf20ca 100644 --- a/include/asm-i386/dma-mapping.h +++ b/include/asm-i386/dma-mapping.h @@ -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); |