[PATCH] serial: st-asc: Check return value of platform_get_irq() in asc_init_port()

[Yi Yang]

The platform_get_irq() might be failed and return a negative result, there
should be return an error code when platform_get_irq() failed.
Fix it by add check return value of platform_get_irq().

Fixes: c4b058560762 ("serial:st-asc: Add ST ASC driver.")
Signed-off-by: Yi Yang <yiyang13 at huawei.com>
---
 drivers/tty/serial/st-asc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index a821f5d76a26..8321167502dc 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -683,12 +683,16 @@ static int asc_init_port(struct asc_port *ascport,
 	struct resource *res;
 	int ret;
 
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+
 	port->iotype	= UPIO_MEM;
 	port->flags	= UPF_BOOT_AUTOCONF;
 	port->ops	= &asc_uart_ops;
 	port->fifosize	= ASC_FIFO_SIZE;
 	port->dev	= &pdev->dev;
-	port->irq	= platform_get_irq(pdev, 0);
+	port->irq	= ret;
 	port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_ST_ASC_CONSOLE);
 
 	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-- 
2.25.1