diff options
| author | Stefan Wahren <stefan.wahren@i2se.com> | 2018-11-11 21:23:58 +0100 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-12-17 08:26:24 +0100 |
| commit | 6dc6f2619017109e45550accc120f823fdc31c3e (patch) | |
| tree | 76d1dc5b735e35aed0c4f7fe5b48e5498618a029 /drivers/mmc/host/bcm2835.c | |
| parent | 37fefadee8bb665ae337a15aa635dabff9f66ade (diff) | |
| download | linux-stable-6dc6f2619017109e45550accc120f823fdc31c3e.tar.gz linux-stable-6dc6f2619017109e45550accc120f823fdc31c3e.tar.bz2 linux-stable-6dc6f2619017109e45550accc120f823fdc31c3e.zip | |
mmc: bcm2835: Refactor dma_map_sg handling
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>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/bcm2835.c')
| -rw-r--r-- | drivers/mmc/host/bcm2835.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index a7961c391de6..7733dbd57073 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -453,7 +453,7 @@ 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; @@ -499,15 +499,13 @@ 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; |