linux-kernel - [PATCH] serial: st-asc: Fix to check return value of platform_get_irq() in asc_init

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Message-ID: <tencent_1FBC566A2B186CCC634D4109F54D62F2C605@qq.com>
Date:   Sun, 23 Jul 2023 12:28:47 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     patrice.chotard@...s.st.com
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Zhang Shurong <zhang_shurong@...mail.com>
Subject: [PATCH] serial: st-asc: Fix to check return value of platform_get_irq() in asc_init_port()

The platform_get_irq might be failed and return a negative result. So
there should have an error handling code.

Fixed this by adding an error handling code.

Fixes: c4b058560762 ("serial:st-asc: Add ST ASC driver.")
Signed-off-by: Zhang Shurong <zhang_shurong@...mail.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 aa471c9c24d9..2f1807fa9bdb 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -688,9 +688,13 @@ static int asc_init_port(struct asc_port *ascport,
 	port->ops	= &asc_uart_ops;
 	port->fifosize	= ASC_FIFO_SIZE;
 	port->dev	= &pdev->dev;
-	port->irq	= platform_get_irq(pdev, 0);
 	port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_ST_ASC_CONSOLE);
 
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+	port->irq = ret;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	port->membase = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(port->membase))
-- 
2.41.0