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author | Albert Lee <albertcc@tw.ibm.com> | 2005-05-26 03:49:42 -0400 |
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committer | Jeff Garzik <jgarzik@pobox.com> | 2005-05-26 03:49:42 -0400 |
commit | 32529e0128923e42126b5d14e444c18295a452ba (patch) | |
tree | d50736f63bd9692076d68c3f8748f1b6bf540a80 /drivers/message/fusion | |
parent | bef9c558841604116704e10b3d9ff3dbf4939423 (diff) |
[PATCH] libata: Fix zero sg_dma_len() on 64-bit platform
When testing ATAPI PIO data transfer on the ppc64 platform, __atapi_pio_bytes() got zero when
sg_dma_len() is used. I checked the <asm-ppc64/scatterlish.h>, the struct scatterlist is defined as:
struct scatterlist {
struct page *page;
unsigned int offset;
unsigned int length;
/* For TCE support */
u32 dma_address;
u32 dma_length;
};
#define sg_dma_address(sg) ((sg)->dma_address)
#define sg_dma_len(sg) ((sg)->dma_length)
So, if the scatterlist is not DMA mapped, sg_dma_len() will return zero on ppc64.
The same problem should occur on the x86-64 platform.
On the i386 platform, sg_dma_len() returns sg->length, that's why the problem does not occur on an i386.
Changes:
- Use sg->length if the scatterlist is not DMA mapped (yet).
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Diffstat (limited to 'drivers/message/fusion')
0 files changed, 0 insertions, 0 deletions