@@ -1004,6 +1004,11 @@ static void atmel_tx_dma(struct uart_port *port)
desc->callback = atmel_complete_tx_dma;
desc->callback_param = atmel_port;
atmel_port->cookie_tx = dmaengine_submit(desc);
+ if (dma_submit_error(atmel_port->cookie_tx)) {
+ dev_err(port->dev, "dma_submit_error %d\n",
+ atmel_port->cookie_tx);
+ return;
+ }
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -1258,6 +1263,11 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
desc->callback_param = port;
atmel_port->desc_rx = desc;
atmel_port->cookie_rx = dmaengine_submit(desc);
+ if (dma_submit_error(atmel_port->cookie_rx)) {
+ dev_err(port->dev, "dma_submit_error %d\n",
+ atmel_port->cookie_rx);
+ goto chan_err;
+ }
return 0;
The tx_submit() method of struct dma_async_tx_descriptor is entitled to do sanity checks and return errors if encountered. It's not the case for the DMA controller drivers that this client is using (at_h/xdmac), because they currently don't do sanity checks and always return a positive cookie at tx_submit() method. In case the controller drivers will implement sanity checks and return errors, print a message so that the client will be informed that something went wrong at tx_submit() level. Fixes: 08f738be88bb ("serial: at91: add tx dma support") Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Richard Genoud <richard.genoud@gmail.com> --- drivers/tty/serial/atmel_serial.c | 10 ++++++++++ 1 file changed, 10 insertions(+)