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author | Jason Gunthorpe <jgg@mellanox.com> | 2019-01-04 21:40:21 +0300 |
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committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-02-12 01:02:33 +0300 |
commit | d901b2760dc6cd5fbbf2eac31d71d94baa6c4aef (patch) | |
tree | 6598a5b011cea1bcdf160c2be9fd4e677d387e2b /arch/sparc/configs | |
parent | f368ff188ae4b3ef6f740a15999ea0373261b619 (diff) | |
download | linux-d901b2760dc6cd5fbbf2eac31d71d94baa6c4aef.tar.xz |
lib/scatterlist: Provide a DMA page iterator
Commit 2db76d7c3c6d ("lib/scatterlist: sg_page_iter: support sg lists w/o
backing pages") introduced the sg_page_iter_dma_address() function without
providing a way to use it in the general case. If the sg_dma_len() is not
equal to the sg length callers cannot safely use the
for_each_sg_page/sg_page_iter_dma_address combination.
Resolve this API mistake by providing a DMA specific iterator,
for_each_sg_dma_page(), that uses the right length so
sg_page_iter_dma_address() works as expected with all sglists.
A new iterator type is introduced to provide compile-time safety against
wrongly mixing accessors and iterators.
Acked-by: Christoph Hellwig <hch@lst.de> (for scatterlist)
Acked-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> (ipu3-cio2)
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'arch/sparc/configs')
0 files changed, 0 insertions, 0 deletions