linux-kernel - [PATCH V2] tty: serial: lpuart: fix lpuart32

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Message-Id: <20200929091920.22612-1-peng.fan@nxp.com>
Date:   Tue, 29 Sep 2020 17:19:20 +0800
From:   Peng Fan <peng.fan@....com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        andrew.smirnov@...il.com
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com, Peng Fan <peng.fan@....com>
Subject: [PATCH V2] tty: serial: lpuart: fix lpuart32_write usage

The 2nd and 3rd parameter were wrongly used, and cause kernel abort when
doing kgdb debug.

Fixes: 1da17d7cf8e2c4("tty: serial: fsl_lpuart: Use appropriate lpuart32_* I/O funcs")
Signed-off-by: Peng Fan <peng.fan@....com>
---

V2:
 Fix poll init

 drivers/tty/serial/fsl_lpuart.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 5a5a22d77841..645bbb24b433 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -649,26 +649,24 @@ static int lpuart32_poll_init(struct uart_port *port)
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	/* Disable Rx & Tx */
-	lpuart32_write(&sport->port, UARTCTRL, 0);
+	lpuart32_write(&sport->port, 0, UARTCTRL);
 
 	temp = lpuart32_read(&sport->port, UARTFIFO);
 
 	/* Enable Rx and Tx FIFO */
-	lpuart32_write(&sport->port, UARTFIFO,
-		       temp | UARTFIFO_RXFE | UARTFIFO_TXFE);
+	lpuart32_write(&sport->port, temp | UARTFIFO_RXFE | UARTFIFO_TXFE, UARTFIFO);
 
 	/* flush Tx and Rx FIFO */
-	lpuart32_write(&sport->port, UARTFIFO,
-		       UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH);
+	lpuart32_write(&sport->port, UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH, UARTFIFO);
 
 	/* explicitly clear RDRF */
 	if (lpuart32_read(&sport->port, UARTSTAT) & UARTSTAT_RDRF) {
 		lpuart32_read(&sport->port, UARTDATA);
-		lpuart32_write(&sport->port, UARTFIFO, UARTFIFO_RXUF);
+		lpuart32_write(&sport->port, UARTFIFO_RXUF, UARTFIFO);
 	}
 
 	/* Enable Rx and Tx */
-	lpuart32_write(&sport->port, UARTCTRL, UARTCTRL_RE | UARTCTRL_TE);
+	lpuart32_write(&sport->port, UARTCTRL_RE | UARTCTRL_TE, UARTCTRL);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 
 	return 0;
@@ -677,7 +675,7 @@ static int lpuart32_poll_init(struct uart_port *port)
 static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c)
 {
 	lpuart32_wait_bit_set(port, UARTSTAT, UARTSTAT_TDRE);
-	lpuart32_write(port, UARTDATA, c);
+	lpuart32_write(port, c, UARTDATA);
 }
 
 static int lpuart32_poll_get_char(struct uart_port *port)
-- 
2.28.0