linux-kernel - [PATCH v1 1/1] serial: liteuart: Don't mix devm_*() with non-devm

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Date:   Mon, 23 Jan 2023 21:17:41 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gabriel Somlo <gsomlo@...il.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Karol Gugala <kgugala@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Joel Stanley <joel@....id.au>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] serial: liteuart: Don't mix devm_*() with non-devm_*() calls

In the probe we need to call all devm_*() first followed by
non-devm_*() calls. This is due to reversed clean up that
may happen in a wrong order otherwise. The driver currently
allocates xarray before calling
devm_platform_get_and_ioremap_resource(). While it's not an
issue in this certain case, it's still better to be pedantic.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/tty/serial/liteuart.c | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
index 192ad681de35..562892395570 100644
--- a/drivers/tty/serial/liteuart.c
+++ b/drivers/tty/serial/liteuart.c
@@ -286,37 +286,35 @@ static int liteuart_probe(struct platform_device *pdev)
 	struct xa_limit limit;
 	int dev_id, ret;
 
-	/* look for aliases; auto-enumerate for free index if not found */
-	dev_id = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (dev_id < 0)
-		limit = XA_LIMIT(0, CONFIG_SERIAL_LITEUART_MAX_PORTS);
-	else
-		limit = XA_LIMIT(dev_id, dev_id);
-
 	uart = devm_kzalloc(&pdev->dev, sizeof(struct liteuart_port), GFP_KERNEL);
 	if (!uart)
 		return -ENOMEM;
 
-	ret = xa_alloc(&liteuart_array, &dev_id, uart, limit, GFP_KERNEL);
-	if (ret)
-		return ret;
-
-	uart->id = dev_id;
 	port = &uart->port;
 
 	/* get membase */
 	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
-	if (IS_ERR(port->membase)) {
-		ret = PTR_ERR(port->membase);
-		goto err_erase_id;
-	}
+	if (IS_ERR(port->membase))
+		return PTR_ERR(port->membase);
 
 	ret = platform_get_irq_optional(pdev, 0);
 	if (ret < 0 && ret != -ENXIO)
-		goto err_erase_id;
+		return ret;
 	if (ret > 0)
 		port->irq = ret;
 
+	/* look for aliases; auto-enumerate for free index if not found */
+	dev_id = of_alias_get_id(pdev->dev.of_node, "serial");
+	if (dev_id < 0)
+		limit = XA_LIMIT(0, CONFIG_SERIAL_LITEUART_MAX_PORTS);
+	else
+		limit = XA_LIMIT(dev_id, dev_id);
+
+	ret = xa_alloc(&liteuart_array, &dev_id, uart, limit, GFP_KERNEL);
+	if (ret)
+		return ret;
+
+	uart->id = dev_id;
 	/* values not from device tree */
 	port->dev = &pdev->dev;
 	port->iotype = UPIO_MEM;
-- 
2.39.0