[04/11] mmc: omap: handle chained sglists
diff mbox series

Message ID 20190114095804.27978-5-hch@lst.de
State New
Headers show
Series
  • [01/11] mmc: davinci: handle highmem pages
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Commit Message

Christoph Hellwig Jan. 14, 2019, 9:57 a.m. UTC
Use the proper sg_next() helper to move to the next scatterlist element
to support chained scatterlists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/mmc/host/omap.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

Patch
diff mbox series

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 0377ac6194a0..248707aba2df 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -148,7 +148,7 @@  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;
@@ -646,11 +646,8 @@  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;
 }
@@ -667,13 +664,12 @@  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;
@@ -985,7 +981,7 @@  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;