diff options
Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
| -rw-r--r-- | drivers/spi/spi-s3c64xx.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 6d6537d09d4f..5000586cb98d 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -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) |