From 7d1f1bf699efc9b0f0e92c910dc667a4511943f5 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Thu, 24 Mar 2016 15:35:42 +0200 Subject: spi: pxa2xx: handle error of pxa2xx_spi_dma_prepare() If by some reason pxa2xx_spi_dma_prepare() fails we have not to ignore its error. In such case we abort the transfer and return the error to upper level. Signed-off-by: Andy Shevchenko [Jarkko: Avoid leaking TX descriptors in case RX descriptor allocation fails. Noted by Robert Jarzmik . Unmap also buffers in case of failure.] Signed-off-by: Jarkko Nikula Acked-by: Robert Jarzmik Signed-off-by: Mark Brown --- drivers/spi/spi-pxa2xx-dma.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'drivers/spi/spi-pxa2xx-dma.c') diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c index 365fc22c3572..b1883d228103 100644 --- a/drivers/spi/spi-pxa2xx-dma.c +++ b/drivers/spi/spi-pxa2xx-dma.c @@ -267,19 +267,22 @@ irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data) int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst) { struct dma_async_tx_descriptor *tx_desc, *rx_desc; + int err = 0; tx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_MEM_TO_DEV); if (!tx_desc) { dev_err(&drv_data->pdev->dev, "failed to get DMA TX descriptor\n"); - return -EBUSY; + err = -EBUSY; + goto err_tx; } rx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_DEV_TO_MEM); if (!rx_desc) { dev_err(&drv_data->pdev->dev, "failed to get DMA RX descriptor\n"); - return -EBUSY; + err = -EBUSY; + goto err_rx; } /* We are ready when RX completes */ @@ -289,6 +292,12 @@ int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst) dmaengine_submit(rx_desc); dmaengine_submit(tx_desc); return 0; + +err_rx: + dmaengine_terminate_async(drv_data->tx_chan); +err_tx: + pxa2xx_spi_unmap_dma_buffers(drv_data); + return err; } void pxa2xx_spi_dma_start(struct driver_data *drv_data) -- cgit v1.2.3