[PATCH V5 13/16] scsi: pcmcia: nsp_cs: use sg helper to operate scatterlist

[Ming Lei]

Use the scatterlist iterators and remove direct indexing of the
scatterlist array.

This way allows us to pre-allocate one small scatterlist, which can be
chained with one runtime allocated scatterlist if the pre-allocated one
isn't enough for the whole request.

Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Bart Van Assche <bvanassche at acm.org>
Signed-off-by: Ming Lei <ming.lei at redhat.com>
---
 drivers/scsi/pcmcia/nsp_cs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/pcmcia/nsp_cs.c b/drivers/scsi/pcmcia/nsp_cs.c
index a81748e6e8fb..97416e1dcc5b 100644
--- a/drivers/scsi/pcmcia/nsp_cs.c
+++ b/drivers/scsi/pcmcia/nsp_cs.c
@@ -789,7 +789,7 @@ static void nsp_pio_read(struct scsi_cmnd *SCpnt)
 		    SCpnt->SCp.buffers_residual != 0 ) {
 			//nsp_dbg(NSP_DEBUG_DATA_IO, "scatterlist next timeout=%d", time_out);
 			SCpnt->SCp.buffers_residual--;
-			SCpnt->SCp.buffer++;
+			SCpnt->SCp.buffer = sg_next(SCpnt->SCp.buffer);
 			SCpnt->SCp.ptr		 = BUFFER_ADDR;
 			SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
 			time_out = 1000;
@@ -887,7 +887,7 @@ static void nsp_pio_write(struct scsi_cmnd *SCpnt)
 		    SCpnt->SCp.buffers_residual != 0 ) {
 			//nsp_dbg(NSP_DEBUG_DATA_IO, "scatterlist next");
 			SCpnt->SCp.buffers_residual--;
-			SCpnt->SCp.buffer++;
+			SCpnt->SCp.buffer = sg_next(SCpnt->SCp.buffer);
 			SCpnt->SCp.ptr		 = BUFFER_ADDR;
 			SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
 			time_out = 1000;
-- 
2.20.1