This is a note to let you know that I've just added the patch titled

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

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: serial-sh-sci-suppress-warning-for-ports-without-dma-channels.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Dec 6 18:04:41 CET 2017

From: Andy Lowe andy_lowe@mentor.com Date: Fri, 22 Sep 2017 20:29:30 +0200 Subject: serial: sh-sci: suppress warning for ports without dma channels

From: Andy Lowe andy_lowe@mentor.com

[ 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: 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 Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/sh-sci.c | 8 ++++++++ 1 file changed, 8 insertions(+)

--- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1491,6 +1491,14 @@ static void sci_request_dma(struct uart_ 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) {

Patches currently in stable-queue which might be from andy_lowe@mentor.com are

queue-4.14/serial-sh-sci-suppress-warning-for-ports-without-dma-channels.patch