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mmc: bcm2835: Properly handle dmaengine_prep_slave_sg

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In case dmaengine_prep_slave_sg fails we need to call dma_unmap_sg.

Signed-off-by: Stefan Wahren <[email protected]>
Acked-by: Eric Anholt <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
This commit is contained in:
Stefan Wahren authored and Ulf Hansson committed 2018-12-17 08:26:24 +01:00
1 parent 6dc6f26190
commit 2f5da67835
1 file changed
+9 -6
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drivers/mmc/host/bcm2835.c
+9 -6
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@@ -507,13 +507,16 @@ void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data)
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;
desc->callback_param = host;
host->dma_desc = desc;
host->dma_chan = dma_chan;
host->dma_dir = dir_data;
if (!desc) {
dma_unmap_sg(dma_chan->device->dev, data->sg, sg_len, dir_data);
return;
}
desc->callback = bcm2835_dma_complete;
desc->callback_param = host;
host->dma_desc = desc;
host->dma_chan = dma_chan;
host->dma_dir = dir_data;
}
static void bcm2835_start_dma(struct bcm2835_host *host)