From: Ke Zhang <m202171830@hust.edu.cn>
Date: Fri, 28 Apr 2023 03:16:36 +0000 (+0800)
Subject: serial: arc_uart: fix of_iomap leak in `arc_serial_probe`
X-Git-Tag: baikal/aarch64/sdk5.10~98
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=1082f88ec37c84dbb6c7038c38886e9ae8707dc9;p=kernel.git

serial: arc_uart: fix of_iomap leak in `arc_serial_probe`

[ Upstream commit 8ab5fc55d7f65d58a3c3aeadf11bdf60267cd2bd ]

Smatch reports:

drivers/tty/serial/arc_uart.c:631 arc_serial_probe() warn:
'port->membase' from of_iomap() not released on lines: 631.

In arc_serial_probe(), if uart_add_one_port() fails,
port->membase is not released, which would cause a resource leak.

To fix this, I replace of_iomap with devm_platform_ioremap_resource.

Fixes: 3ac9e08d7b50 ("serial/arc: inline the probe helper")
Signed-off-by: Ke Zhang <m202171830@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Link: https://lore.kernel.org/r/20230428031636.44642-1-m202171830@hust.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index d904a3a345e74..dd4be3c8c049c 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -613,10 +613,11 @@ static int arc_serial_probe(struct platform_device *pdev)
 	}
 	uart->baud = val;
 
-	port->membase = of_iomap(np, 0);
-	if (!port->membase)
+	port->membase = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(port->membase)) {
 		/* No point of dev_err since UART itself is hosed here */
-		return -ENXIO;
+		return PTR_ERR(port->membase);
+	}
 
 	port->irq = irq_of_parse_and_map(np, 0);