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-rw-r--r--lib/scatterlist.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index e102fdfaa75b..ed2497c79a21 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -404,7 +404,7 @@ static struct scatterlist *get_next_sg(struct sg_table *table,
* @n_pages: Number of pages in the pages array
* @offset: Offset from start of the first page to the start of a buffer
* @size: Number of valid bytes in the buffer (after offset)
- * @max_segment: Maximum size of a scatterlist node in bytes (page aligned)
+ * @max_segment: Maximum size of a scatterlist element in bytes
* @prv: Last populated sge in sgt
* @left_pages: Left pages caller have to set after this call
* @gfp_mask: GFP allocation mask
@@ -435,7 +435,12 @@ struct scatterlist *__sg_alloc_table_from_pages(struct sg_table *sgt,
unsigned int added_nents = 0;
struct scatterlist *s = prv;
- if (WARN_ON(!max_segment || offset_in_page(max_segment)))
+ /*
+ * The algorithm below requires max_segment to be aligned to PAGE_SIZE
+ * otherwise it can overshoot.
+ */
+ max_segment = ALIGN_DOWN(max_segment, PAGE_SIZE);
+ if (WARN_ON(max_segment < PAGE_SIZE))
return ERR_PTR(-EINVAL);
if (IS_ENABLED(CONFIG_ARCH_NO_SG_CHAIN) && prv)
@@ -542,8 +547,7 @@ int sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages,
unsigned long size, gfp_t gfp_mask)
{
return PTR_ERR_OR_ZERO(__sg_alloc_table_from_pages(sgt, pages, n_pages,
- offset, size, SCATTERLIST_MAX_SEGMENT,
- NULL, 0, gfp_mask));
+ offset, size, UINT_MAX, NULL, 0, gfp_mask));
}
EXPORT_SYMBOL(sg_alloc_table_from_pages);

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