linux-kernel - [PATCH 1/3] serial: sprd: check the right port and membase

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Date:   Mon, 26 Aug 2019 15:29:27 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...aro.org>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH 1/3] serial: sprd: check the right port and membase

From: Chunyan Zhang <chunyan.zhang@...soc.com>

When calling sprd_console_setup(), sprd_uart_port probably is NULL,
we should check that first instead of checking its items directly.

Also we should check membase to avoid accessing uart device before
its initialization finished.

Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
Signed-off-by: Chunyan Zhang <zhang.lyra@...il.com>
---
 drivers/tty/serial/sprd_serial.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 73d71a4e6c0c..a3be4e2dd019 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -975,7 +975,7 @@ static void sprd_console_write(struct console *co, const char *s,
 
 static int __init sprd_console_setup(struct console *co, char *options)
 {
-	struct uart_port *port;
+	struct sprd_uart_port *sprd_uart_port;
 	int baud = 115200;
 	int bits = 8;
 	int parity = 'n';
@@ -984,15 +984,17 @@ static int __init sprd_console_setup(struct console *co, char *options)
 	if (co->index >= UART_NR_MAX || co->index < 0)
 		co->index = 0;
 
-	port = &sprd_port[co->index]->port;
-	if (port == NULL) {
+	sprd_uart_port = sprd_port[co->index];
+	if (!sprd_uart_port || !sprd_uart_port->port.membase) {
 		pr_info("serial port %d not yet initialized\n", co->index);
 		return -ENODEV;
 	}
+
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
-	return uart_set_options(port, co, baud, parity, bits, flow);
+	return uart_set_options(&sprd_uart_port->port, co, baud,
+				parity, bits, flow);
 }
 
 static struct uart_driver sprd_uart_driver;
-- 
2.20.1