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block: allow queue dma_alignment of zero

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Let queue_dma_alignment return 0 if it was specifically set to 0.
This permits devices with no particular alignment restrictions to
use arbitrary user space buffers without copying.

Signed-off-by: Pete Wyckoff <pw@osc.edu>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Pete Wyckoff 2008-01-01 10:23:02 -05:00 committed by Jens Axboe
parent 6da127ad09
commit 482eb68916
1 changed files with 1 additions and 6 deletions
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7
include/linux/blkdev.h
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@ -836,12 +836,7 @@ static inline int bdev_hardsect_size(struct block_device *bdev)
static inline int queue_dma_alignment(struct request_queue *q) static inline int queue_dma_alignment(struct request_queue *q)
{ {
int retval = 511; return q ? q->dma_alignment : 511;
if (q && q->dma_alignment)
retval = q->dma_alignment;
return retval;
} }
/* assumes size > 256 */ /* assumes size > 256 */