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-rw-r--r--include/linux/libata.h16
1 files changed, 14 insertions, 2 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9e5db2949c5..c91be5e64ed 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -557,17 +557,29 @@ ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
}
static inline struct scatterlist *
+ata_qc_first_sg(struct ata_queued_cmd *qc)
+{
+ if (qc->n_elem)
+ return qc->__sg;
+ if (qc->pad_len)
+ return &qc->pad_sgent;
+ return NULL;
+}
+
+static inline struct scatterlist *
ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
{
if (sg == &qc->pad_sgent)
return NULL;
if (++sg - qc->__sg < qc->n_elem)
return sg;
- return qc->pad_len ? &qc->pad_sgent : NULL;
+ if (qc->pad_len)
+ return &qc->pad_sgent;
+ return NULL;
}
#define ata_for_each_sg(sg, qc) \
- for (sg = qc->__sg; sg; sg = ata_qc_next_sg(sg, qc))
+ for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
static inline unsigned int ata_tag_valid(unsigned int tag)
{