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authorJason Gunthorpe <jgg@mellanox.com>2019-01-04 11:40:21 -0700
committerJason Gunthorpe <jgg@mellanox.com>2019-02-11 15:02:33 -0700
commitd901b2760dc6cd5fbbf2eac31d71d94baa6c4aef (patch)
tree6598a5b011cea1bcdf160c2be9fd4e677d387e2b /drivers/media/pci/intel
parentf368ff188ae4b3ef6f740a15999ea0373261b619 (diff)
downloadlinux-d901b2760dc6cd5fbbf2eac31d71d94baa6c4aef.tar.bz2
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 'drivers/media/pci/intel')
-rw-r--r--drivers/media/pci/intel/ipu3/ipu3-cio2.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2.c b/drivers/media/pci/intel/ipu3/ipu3-cio2.c
index cdb79ae2d8dc..9fbfbda74171 100644
--- a/drivers/media/pci/intel/ipu3/ipu3-cio2.c
+++ b/drivers/media/pci/intel/ipu3/ipu3-cio2.c
@@ -846,7 +846,7 @@ static int cio2_vb2_buf_init(struct vb2_buffer *vb)
unsigned int pages = DIV_ROUND_UP(vb->planes[0].length, CIO2_PAGE_SIZE);
unsigned int lops = DIV_ROUND_UP(pages + 1, entries_per_page);
struct sg_table *sg;
- struct sg_page_iter sg_iter;
+ struct sg_dma_page_iter sg_iter;
int i, j;
if (lops <= 0 || lops > CIO2_MAX_LOPS) {
@@ -873,7 +873,7 @@ static int cio2_vb2_buf_init(struct vb2_buffer *vb)
b->offset = sg->sgl->offset;
i = j = 0;
- for_each_sg_page(sg->sgl, &sg_iter, sg->nents, 0) {
+ for_each_sg_dma_page (sg->sgl, &sg_iter, sg->nents, 0) {
if (!pages--)
break;
b->lop[i][j] = sg_page_iter_dma_address(&sg_iter) >> PAGE_SHIFT;