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| author | Andy Lowe <andy_lowe@mentor.com> | 2017-09-22 20:29:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-04 10:17:27 +0200 |
| commit | 7464779fa8551b90d5797d4020b0bdb7e6422eb9 (patch) | |
| tree | c6f593c091d16fe1533e8b315776906f122e3750 /drivers/tty | |
| parent | serial: 8250_mid: Enable HSU on Intel Cedar Fork PCH (diff) | |
| download | linux-7464779fa8551b90d5797d4020b0bdb7e6422eb9.tar.xz linux-7464779fa8551b90d5797d4020b0bdb7e6422eb9.zip | |
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>
Diffstat (limited to 'drivers/tty')
| -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) { |