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-rw-r--r--drivers/mmc/host/atmel-mci.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 7b603e4b41db..5e10d3663ab5 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -576,6 +576,7 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
struct scatterlist *sg;
unsigned int i;
enum dma_data_direction direction;
+ unsigned int sglen;
/*
* We don't do DMA on "complex" transfers, i.e. with
@@ -605,11 +606,14 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
else
direction = DMA_TO_DEVICE;
+ sglen = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, direction);
+ if (sglen != data->sg_len)
+ goto unmap_exit;
desc = chan->device->device_prep_slave_sg(chan,
data->sg, data->sg_len, direction,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc)
- return -ENOMEM;
+ goto unmap_exit;
host->dma.data_desc = desc;
desc->callback = atmci_dma_complete;
@@ -620,6 +624,9 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
chan->device->device_issue_pending(chan);
return 0;
+unmap_exit:
+ dma_unmap_sg(&host->pdev->dev, data->sg, sglen, direction);
+ return -ENOMEM;
}
#else /* CONFIG_MMC_ATMELMCI_DMA */