diff options
Diffstat (limited to 'include/linux/scatterlist.h')
| -rw-r--r-- | include/linux/scatterlist.h | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 138e2f1bd08f..6f8a4965f9b9 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -95,6 +95,28 @@ static inline bool sg_is_last(struct scatterlist *sg) } /** + * sg_next - return the next scatterlist entry in a list + * @sg: The current sg entry + * + * Description: + * Usually the next entry will be @sg + 1, but if this sg element is part + * of a chained scatterlist, it could jump to the start of a new + * scatterlist array. + * + **/ +static inline struct scatterlist *sg_next(struct scatterlist *sg) +{ + if (sg_is_last(sg)) + return NULL; + + sg++; + if (unlikely(sg_is_chain(sg))) + sg = sg_chain_ptr(sg); + + return sg; +} + +/** * sg_assign_page - Assign a given page to an SG entry * @sg: SG entry * @page: The page @@ -232,7 +254,7 @@ static inline void __sg_chain(struct scatterlist *chain_sg, * @sgl: Second scatterlist * * Description: - * Links @prv@ and @sgl@ together, to form a longer scatterlist. + * Links @prv and @sgl together, to form a longer scatterlist. * **/ static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents, @@ -418,7 +440,6 @@ static inline void sg_init_marker(struct scatterlist *sgl, int sg_nents(struct scatterlist *sg); int sg_nents_for_len(struct scatterlist *sg, u64 len); -struct scatterlist *sg_next(struct scatterlist *); struct scatterlist *sg_last(struct scatterlist *s, unsigned int); void sg_init_table(struct scatterlist *, unsigned int); void sg_init_one(struct scatterlist *, const void *, unsigned int); |