[PATCH 07/14] mmc: omap: handle chained sglists

[Christoph Hellwig]

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/omap.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 6741c95f2281..8cd39bc087fa 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -147,7 +147,7 @@ struct mmc_omap_host {
        struct mmc_data         *stop_data;
 
        unsigned int            sg_len;
-       int                     sg_idx;
+       struct scatterlist      *cur_sg;
        u32                     buffer_offset;
        u32                     buffer_bytes_left;
        u32                     total_bytes_left;
@@ -645,11 +645,8 @@ mmc_omap_cmd_timer(struct timer_list *t)
 static void
 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 {
-       struct scatterlist *sg;
-
-       sg = host->data->sg + host->sg_idx;
-       host->buffer_bytes_left = sg->length;
-       host->buffer_offset = sg->offset;
+       host->buffer_bytes_left = host->cur_sg->length;
+       host->buffer_offset = host->cur_sg->offset;
        if (host->buffer_bytes_left > host->total_bytes_left)
                host->buffer_bytes_left = host->total_bytes_left;
 }
@@ -666,13 +663,12 @@ mmc_omap_clk_timer(struct timer_list *t)
 static void
 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 {
-       struct scatterlist *sg = host->data->sg + host->sg_idx;
+       struct scatterlist *sg = host->cur_sg;
        int n, nwords;
        void *p;
 
        if (host->buffer_bytes_left == 0) {
-               host->sg_idx++;
-               BUG_ON(host->sg_idx == host->sg_len);
+               host->cur_sg = sg_next(host->cur_sg);
                mmc_omap_sg_to_buf(host);
        }
        n = 64;
@@ -984,7 +980,7 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct 
mmc_request *req)
                }
        }
 
-       host->sg_idx = 0;
+       host->cur_sg = host->data->sg;
        if (use_dma) {
                enum dma_data_direction dma_data_dir;
                struct dma_async_tx_descriptor *tx;
-- 
2.20.1