> static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
> {
> +#if defined(CONFIG_DMADEV_PL330)
> + dma_cap_mask_t mask;
> + dma_cap_zero(mask);
> + dma_cap_set(DMA_SLAVE, mask);
> + sdd->rx_chan =
> + dma_request_channel(mask, rxfilter, (void *)sdd);
> + if (!sdd->rx_chan) {
> + dev_err(&sdd->pdev->dev, "cannot get RxDMA\n");
> + return 0;
> + }
> + sdd->tx_chan =
> + dma_request_channel(mask, txfilter, (void *)sdd);
> + if (!sdd->tx_chan) {
> + dev_err(&sdd->pdev->dev, "cannot get TxDMA\n");
> + return 0;
> + }
> +#else
When acquiring tx_chan is failed, you must release a rx_chan before
error return.
If not, the rx_chan is always busy because it was allocated in the
previous attempt.
--
Best Regards,
Chanho Park
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