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| author |   Huacai Chen <chenhc@lemote.com> | 2017-11-21 14:23:38 +0100 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2017-11-21 23:05:57 -0500 |
| commit | 90addc6b3c9cda0146fbd62a08e234c2b224a80c (patch) | |
| tree | 7cdc0b3f4b87d26c8f91125edaea8723764526bf /include/scsi | |
| parent | scsi: dma-mapping: always provide dma_get_cache_alignment (diff) | |
| download | linux-dev-90addc6b3c9cda0146fbd62a08e234c2b224a80c.tar.xz linux-dev-90addc6b3c9cda0146fbd62a08e234c2b224a80c.zip | |
scsi: use dma_get_cache_alignment() as minimum DMA alignment
In non-coherent DMA mode, kernel uses cache flushing operations to
maintain I/O coherency, so scsi's block queue should be aligned to the
value returned by dma_get_cache_alignment(). Otherwise, If a DMA buffer
and a kernel structure share a same cache line, and if the kernel
structure has dirty data, cache_invalidate (no writeback) will cause
data corruption.
Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhc@lemote.com>
[hch: rebased and updated the comment and changelog]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/scsi')
0 files changed, 0 insertions, 0 deletions