diff options
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 41bf9103ed3f..9fde3df1b3a8 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1506,6 +1506,14 @@ static void sci_request_dma(struct uart_port *port) return; s->cookie_tx = -EINVAL; + + /* + * Don't request a dma channel if no channel was specified + * in the device tree. + */ + if (!of_find_property(port->dev->of_node, "dmas", NULL)) + return; + chan = sci_request_dma_chan(port, DMA_MEM_TO_DEV); dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan); if (chan) { |