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spi/s3c64xx: Check for errors in dmaengine prepare_transfer()

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Don't silently ignore errors, report them.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-04-18 18:12:00 +01:00
parent 563b444e33
commit fb9d044efb
1 changed files with 25 additions and 1 deletions
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26
drivers/spi/spi-s3c64xx.c
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@ -421,6 +421,7 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
dma_filter_fn filter = sdd->cntrlr_info->filter;
struct device *dev = &sdd->pdev->dev;
dma_cap_mask_t mask;
int ret;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
@ -428,11 +429,34 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
/* Acquire DMA channels */
sdd->rx_dma.ch = dma_request_slave_channel_compat(mask, filter,
(void*)sdd->rx_dma.dmach, dev, "rx");
if (!sdd->rx_dma.ch) {
dev_err(dev, "Failed to get RX DMA channel\n");
ret = -EBUSY;
goto out;
}
sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter,
(void*)sdd->tx_dma.dmach, dev, "tx");
pm_runtime_get_sync(&sdd->pdev->dev);
if (!sdd->tx_dma.ch) {
dev_err(dev, "Failed to get TX DMA channel\n");
ret = -EBUSY;
goto out_rx;
}
ret = pm_runtime_get_sync(&sdd->pdev->dev);
if (ret != 0) {
dev_err(dev, "Failed to enable device: %d\n", ret);
goto out_tx;
}
return 0;
out_tx:
dma_release_channel(sdd->tx_dma.ch);
out_rx:
dma_release_channel(sdd->rx_dma.ch);
out:
return ret;
}
static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)