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swiotlb: remove a pointless comment 

This comments describes an aspect of the map_sg interface that isn't
even exploited by swiotlb.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-04-12 10:46:01 +02:00
parent b9fd04262a
commit 21bb9d64c5
1 changed files with 0 additions and 6 deletions
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6
kernel/dma/swiotlb.c
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@ -925,12 +925,6 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
* appropriate dma address and length. They are obtained via
* sg_dma_{address,length}(SG).
*
* NOTE: An implementation may be able to use a smaller number of
* DMA address/length pairs than there are SG table elements.
* (for example via virtual mapping capabilities)
* The routine returns the number of addr/length pairs actually
* used, at most nents.
*
* Device ownership issues as mentioned above for swiotlb_map_page are the
* same here.
*/