Commit 7464779f authored Sep 22, 2017 by Andy Lowe Committed by Greg Kroah-Hartman Oct 04, 2017

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>

parent daf3930c

drivers/tty/serial/sh-sci.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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) {

Admin message