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authorPete Wyckoff <pw@osc.edu>2008-01-01 10:23:02 -0500
committerJens Axboe <jens.axboe@oracle.com>2008-01-28 10:04:46 +0100
commit482eb689169948e9f4966fbae6be4d6bc0bfa818 (patch)
tree93f2e9915b34192a92442fbf800d3a9b47819909 /include/linux
parent6da127ad0918f93ea93678dad62ce15ffed18797 (diff)
block: allow queue dma_alignment of zero
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/blkdev.h7
1 files changed, 1 insertions, 6 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 49b7a4c31a6..c7a3ab575c2 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -836,12 +836,7 @@ static inline int bdev_hardsect_size(struct block_device *bdev)
static inline int queue_dma_alignment(struct request_queue *q)
{
- int retval = 511;
-
- if (q && q->dma_alignment)
- retval = q->dma_alignment;
-
- return retval;
+ return q ? q->dma_alignment : 511;
}
/* assumes size > 256 */