scsi: use dma_get_cache_alignment() as minimum DMA alignment

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commit 90addc6b3c upstream.

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.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Huacai Chen 2017-11-21 14:23:38 +01:00 • committed by Greg Kroah-Hartman

parent bc2b304604

commit 21747052c4

1 changed files with 6 additions and 4 deletions

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drivers/scsi/scsi_lib.c

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