serial: pl011: protect attribute read from NULL platform data struct

It's completely feasible that platform data will be empty i.e. when
booting with Device Tree with no device AUXDATA. So we must protect
it's use in these use-cases, or risk a kernel Oops.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
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 8ab70a6209199145f840b9d0cff0b255700f454c..e2774f9ecd59f16915e0647028e643e616b9c4cb 100644 (file)
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -332,7 +332,7 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *
                dmaengine_slave_config(chan, &rx_conf);
                uap->dmarx.chan = chan;
 
-               if (plat->dma_rx_poll_enable) {
+               if (plat && plat->dma_rx_poll_enable) {
                        /* Set poll rate if specified. */
                        if (plat->dma_rx_poll_rate) {
                                uap->dmarx.auto_poll_rate = false;