From c58caaab3bf87a6470c1a4641ea7fa5192e12bdd Mon Sep 17 00:00:00 2001
From: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Date: Fri, 13 Jul 2018 17:01:19 +0200
Subject: [PATCH] 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>
---
drivers/tty/serial/8250/8250_of.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 863e86b9a4240..af8beefe9b5c3 100644
--- 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)) {
--
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