Use the proper sg_next() helper to move to the next scatterlist element
to support chained scatterlists.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/mmc/host/s3cmci.c | 19 +++++++++----------
 drivers/mmc/host/s3cmci.h |  2 +-
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 1be84426c817..2660fb61d1d0 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -320,20 +320,19 @@ static void s3cmci_check_sdio_irq(struct s3cmci_host 
*host)
 
 static inline int get_data_buffer(struct s3cmci_host *host)
 {
-       if (host->pio_sgptr >= host->mrq->data->sg_len) {
-               dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
-                     host->pio_sgptr, host->mrq->data->sg_len);
+       if (!host->next_sg) {
+               dbg(host, dbg_debug, "no more buffers (%i)\n",
+                     host->mrq->data->sg_len);
                return -EBUSY;
        }
-       host->cur_sg = &host->mrq->data->sg[host->pio_sgptr];
+       host->cur_sg = host->next_sg;
+       host->next_sg = sg_next(host->next_sg);
 
        host->pio_bytes = host->cur_sg->length;
        host->pio_offset = host->cur_sg->offset;
 
-       host->pio_sgptr++;
-
-       dbg(host, dbg_sg, "new buffer (%i/%i)\n",
-           host->pio_sgptr, host->mrq->data->sg_len);
+       dbg(host, dbg_sg, "new buffer (%i)\n",
+           host->mrq->data->sg_len);
 
        return 0;
 }
@@ -1052,8 +1051,8 @@ static int s3cmci_prepare_pio(struct s3cmci_host *host, 
struct mmc_data *data)
 
        BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 
-       host->pio_sgptr = 0;
-       host->cur_sg = &host->mrq->data->sg[host->pio_sgptr];
+       host->cur_sg = host->mrq->data->sg;
+       host->next_sg = sg_next(host->cur_sg);
        host->pio_bytes = 0;
        host->pio_count = 0;
        host->pio_active = rw ? XFER_WRITE : XFER_READ;
diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index 4320f7d832dc..caf1078d07d1 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -51,7 +51,7 @@ struct s3cmci_host {
        int                     dma_complete;
 
        struct scatterlist      *cur_sg;
-       u32                     pio_sgptr;
+       struct scatterlist      *next_sg;
        u32                     pio_bytes;
        u32                     pio_count;
        u32                     pio_offset;
-- 
2.20.1

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