serial: 8250: of: Defer probe on missing IRQ

If the IRQ controller is not yet probed do not proceed with irq=0,
try to defer the probe.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 863e86b..af8beef 100644 (file)
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -144,6 +144,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
                port->line = ret;
 
        port->irq = irq_of_parse_and_map(np, 0);
+       if (!port->irq) {
+               ret = -EPROBE_DEFER;
+               goto err_unprepare;
+       }
 
        info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
        if (IS_ERR(info->rst)) {