tty: amba-pl011: don't dereference NULL platform data

When only a TX DMA channel is specified in DT, pl011_dma_probe() falls
back to looking for the optional RX channel in platform data. What it
doesn't do is check whether that platform data actually exists...

Add the missing check to avoid crashing the kernel.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 500232a..3f16927 100644 (file)
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -420,7 +420,7 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
        /* Optionally make use of an RX channel as well */
        chan = dma_request_slave_channel(dev, "rx");
 
-       if (!chan && plat->dma_rx_param) {
+       if (!chan && plat && plat->dma_rx_param) {
                chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param);
 
                if (!chan) {