serial: sh-sci: suppress warning for ports without dma channels

If a port has no dma channel defined in the device tree, then
don't attempt to allocate a dma channel for the port.
Also suppress the warning message concerning the failure to allocate
a dma channel.  Continue to emit the warning message if a dma
channel is defined but cannot be allocated.

Signed-off-by: Andy Lowe <andy_lowe@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 41bf9103ed3f06d5488c82dd651cb2e41b4418ee..9fde3df1b3a835c4192695880383fbcbf874e62d 100644 (file)
--- 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) {