linux-kernel - [PATCH V3 6/6] tty: serial: meson: Change request_irq to devm_request_irq and move devm_request_irq to meson_uart

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Date:   Thu, 30 Dec 2021 18:21:10 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Vyacheslav <adeep@...ina.in>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Yu Tu <yu.tu@...ogic.com>
Subject: [PATCH V3 6/6] tty: serial: meson: Change request_irq to devm_request_irq and move devm_request_irq to meson_uart_probe()

Because an interrupt error occurs when the user opens /dev/ttyAML* but
don't close it, and then opens the same port again. This problem is
encountered in actual projects.

Signed-off-by: Yu Tu <yu.tu@...ogic.com>
---
 drivers/tty/serial/meson_uart.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 45e41f20cba3..0dd3f5b35768 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -135,8 +135,6 @@ static void meson_uart_shutdown(struct uart_port *port)
 	unsigned long flags;
 	u32 val;
 
-	free_irq(port->irq, port);
-
 	spin_lock_irqsave(&port->lock, flags);
 
 	val = readl(port->membase + AML_UART_CONTROL);
@@ -284,7 +282,6 @@ static void meson_uart_reset(struct uart_port *port)
 static int meson_uart_startup(struct uart_port *port)
 {
 	u32 val;
-	int ret;
 
 	meson_uart_reset(port);
 
@@ -298,10 +295,7 @@ static int meson_uart_startup(struct uart_port *port)
 	val = (AML_UART_RECV_IRQ(1) | AML_UART_XMIT_IRQ(port->fifosize / 2));
 	writel(val, port->membase + AML_UART_MISC);
 
-	ret = request_irq(port->irq, meson_uart_interrupt, 0,
-			  port->name, port);
-
-	return ret;
+	return 0;
 }
 
 static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
@@ -908,6 +902,14 @@ static int meson_uart_probe(struct platform_device *pdev)
 	meson_ports[pdev->id] = port;
 	platform_set_drvdata(pdev, port);
 
+	ret = devm_request_irq(&pdev->dev, port->irq, meson_uart_interrupt,
+			       0, dev_name(&pdev->dev), port);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request uart irq: %d\n",
+			ret);
+		return ret;
+	}
+
 	/* reset port before registering (and possibly registering console) */
 	meson_uart_reset(port);
 
-- 
2.33.1