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Diffstat (limited to 'include/linux/scatterlist.h')
-rw-r--r--include/linux/scatterlist.h22
1 files changed, 12 insertions, 10 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index d5e1876daf3f..259735044148 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -188,21 +188,23 @@ static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
/**
* sg_mark_end - Mark the end of the scatterlist
- * @sgl: Scatterlist
- * @nents: Number of entries in sgl
+ * @sg: SG entryScatterlist
*
* Description:
- * Marks the last entry as the termination point for sg_next()
+ * Marks the passed in sg entry as the termination point for the sg
+ * table. A call to sg_next() on this entry will return NULL.
*
**/
-static inline void sg_mark_end(struct scatterlist *sgl, unsigned int nents)
-{
- sgl[nents - 1].page_link = 0x02;
-}
-
-static inline void __sg_mark_end(struct scatterlist *sg)
+static inline void sg_mark_end(struct scatterlist *sg)
{
+#ifdef CONFIG_DEBUG_SG
+ BUG_ON(sg->sg_magic != SG_MAGIC);
+#endif
+ /*
+ * Set termination bit, clear potential chain bit
+ */
sg->page_link |= 0x02;
+ sg->page_link &= ~0x01;
}
/**
@@ -218,7 +220,6 @@ static inline void __sg_mark_end(struct scatterlist *sg)
static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
{
memset(sgl, 0, sizeof(*sgl) * nents);
- sg_mark_end(sgl, nents);
#ifdef CONFIG_DEBUG_SG
{
unsigned int i;
@@ -226,6 +227,7 @@ static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
sgl[i].sg_magic = SG_MAGIC;
}
#endif
+ sg_mark_end(&sgl[nents - 1]);
}
/**