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Commit 25aafb30 authored by Andy Lowe's avatar Andy Lowe Committed by Greg Kroah-Hartman
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serial: sh-sci: suppress warning for ports without dma channels 




[ Upstream commit 7464779fa8551b90d5797d4020b0bdb7e6422eb9 ]

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: default avatarAndy Lowe <andy_lowe@mentor.com>
Signed-off-by: default avatarEugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent dddd2bd9

drivers/tty/serial/sh-sci.c

+8 −0
Original line number Diff line number Diff line
@@ -1491,6 +1491,14 @@ 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) {