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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 <andriy.shevchenko@linux.intel.com>
[Jarkko: Avoid leaking TX descriptors in case RX descriptor allocation
fails. Noted by Robert Jarzmik <robert.jarzmik@free.fr>.
Unmap also buffers in case of failure.]
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Andy Shevchenko 2016-03-24 15:35:42 +02:00 committed by Mark Brown
parent f55532a0c0
commit 7d1f1bf699
2 changed files with 18 additions and 3 deletions
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13
drivers/spi/spi-pxa2xx-dma.c
View File

@ -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)

8
drivers/spi/spi-pxa2xx.c
View File

@ -928,6 +928,7 @@ static void pump_transfers(unsigned long data)
u32 dma_thresh = drv_data->cur_chip->dma_threshold;
u32 dma_burst = drv_data->cur_chip->dma_burst_size;
u32 change_mask = pxa2xx_spi_get_ssrc1_change_mask(drv_data);
int err;
/* Get current state information */
message = drv_data->cur_msg;
@ -1047,7 +1048,12 @@ static void pump_transfers(unsigned long data)
/* Ensure we have the correct interrupt handler */
drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
pxa2xx_spi_dma_prepare(drv_data, dma_burst);
err = pxa2xx_spi_dma_prepare(drv_data, dma_burst);
if (err) {
message->status = err;
giveback(drv_data);
return;
}
/* Clear status and start DMA engine */
cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1;