libata: convert to using sg helpers
This converts libata to using the sg helpers for looking up sg
elements, instead of doing it manually.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 229a9ff..377e6d4 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -29,7 +29,7 @@
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
#include <linux/io.h>
#include <linux/ata.h>
#include <linux/workqueue.h>
@@ -416,6 +416,7 @@
unsigned long flags; /* ATA_QCFLAG_xxx */
unsigned int tag;
unsigned int n_elem;
+ unsigned int n_iter;
unsigned int orig_n_elem;
int dma_dir;
@@ -426,7 +427,7 @@
unsigned int nbytes;
unsigned int curbytes;
- unsigned int cursg;
+ struct scatterlist *cursg;
unsigned int cursg_ofs;
struct scatterlist sgent;
@@ -1043,7 +1044,7 @@
return 1;
if (qc->pad_len)
return 0;
- if (((sg - qc->__sg) + 1) == qc->n_elem)
+ if (qc->n_iter == qc->n_elem)
return 1;
return 0;
}
@@ -1051,6 +1052,7 @@
static inline struct scatterlist *
ata_qc_first_sg(struct ata_queued_cmd *qc)
{
+ qc->n_iter = 0;
if (qc->n_elem)
return qc->__sg;
if (qc->pad_len)
@@ -1063,8 +1065,8 @@
{
if (sg == &qc->pad_sgent)
return NULL;
- if (++sg - qc->__sg < qc->n_elem)
- return sg;
+ if (++qc->n_iter < qc->n_elem)
+ return sg_next(sg);
if (qc->pad_len)
return &qc->pad_sgent;
return NULL;
@@ -1309,9 +1311,11 @@
qc->dma_dir = DMA_NONE;
qc->__sg = NULL;
qc->flags = 0;
- qc->cursg = qc->cursg_ofs = 0;
+ qc->cursg = NULL;
+ qc->cursg_ofs = 0;
qc->nbytes = qc->curbytes = 0;
qc->n_elem = 0;
+ qc->n_iter = 0;
qc->err_mask = 0;
qc->pad_len = 0;
qc->sect_size = ATA_SECT_SIZE;