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[6/7] mmc: bcm2835: Refactor dma_map_sg handling

Message ID 1541943930-23873-7-git-send-email-stefan.wahren@i2se.com (mailing list archive)
State New, archived
Headers show
Series mmc: Several fixes for bcm2835 driver | expand

Commit Message

Stefan Wahren Nov. 11, 2018, 1:45 p.m. UTC 
There are two variables len within bcm2835_prepare_dma. So rename the result
of dma_map_sg to sg_len. While we are at this add a bail out to simplify the
following change.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/mmc/host/bcm2835.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 2c7589f..c42bdaa 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -464,7 +464,7 @@  static void bcm2835_transfer_pio(struct bcm2835_host *host)
 static
 void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data)
 {
-	int len, dir_data, dir_slave;
+	int sg_len, dir_data, dir_slave;
 	struct dma_async_tx_descriptor *desc = NULL;
 	struct dma_chan *dma_chan;
 
@@ -510,15 +510,13 @@  void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data)
 				     &host->dma_cfg_rx :
 				     &host->dma_cfg_tx);
 
-	len = dma_map_sg(dma_chan->device->dev, data->sg, data->sg_len,
-			 dir_data);
+	sg_len = dma_map_sg(dma_chan->device->dev, data->sg, data->sg_len,
+			    dir_data);
+	if (!sg_len)
+		return;
 
-	if (len > 0) {
-		desc = dmaengine_prep_slave_sg(dma_chan, data->sg,
-					       len, dir_slave,
-					       DMA_PREP_INTERRUPT |
-					       DMA_CTRL_ACK);
-	}
+	desc = dmaengine_prep_slave_sg(dma_chan, data->sg, sg_len, dir_slave,
+				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 
 	if (desc) {
 		desc->callback = bcm2835_dma_complete;