linux-kernel - [PATCH] serial: core: Fix serial_base_match() after fixing controller port name

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Date:   Wed,  2 Aug 2023 14:48:43 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        kernel test robot <oliver.sang@...el.com>
Subject: [PATCH] serial: core: Fix serial_base_match() after fixing controller port name

While fixing DEVNAME to be more usable, I broke serial_base_match() as
the ctrl and port prefix for device seemed unnecessary.

Let's fix the issue by checking against dev->type and drv->name.

Fixes: 1ef2c2df1199 ("serial: core: Fix serial core controller port name to show controller id")
Reported-by: kernel test robot <oliver.sang@...el.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/tty/serial/serial_base.h     |  3 +++
 drivers/tty/serial/serial_base_bus.c | 10 ++++++++--
 drivers/tty/serial/serial_ctrl.c     |  2 +-
 drivers/tty/serial/serial_port.c     |  2 +-
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/serial_base.h b/drivers/tty/serial/serial_base.h
--- a/drivers/tty/serial/serial_base.h
+++ b/drivers/tty/serial/serial_base.h
@@ -6,6 +6,9 @@
  * Author: Tony Lindgren <tony@...mide.com>
  */
 
+#define SERIAL_BASE_CTRL_NAME	"ctrl"
+#define SERIAL_BASE_PORT_NAME	"port"
+
 #define to_serial_base_ctrl_device(d) container_of((d), struct serial_ctrl_device, dev)
 #define to_serial_base_port_device(d) container_of((d), struct serial_port_device, dev)
 
diff --git a/drivers/tty/serial/serial_base_bus.c b/drivers/tty/serial/serial_base_bus.c
--- a/drivers/tty/serial/serial_base_bus.c
+++ b/drivers/tty/serial/serial_base_bus.c
@@ -29,9 +29,15 @@ static const struct device_type serial_port_type = {
 
 static int serial_base_match(struct device *dev, struct device_driver *drv)
 {
-	int len = strlen(drv->name);
+	if (dev->type == &serial_ctrl_type &&
+	    !strncmp(SERIAL_BASE_CTRL_NAME, drv->name, 4))
+		return 1;
 
-	return !strncmp(dev_name(dev), drv->name, len);
+	if (dev->type == &serial_port_type &&
+	    !strncmp(SERIAL_BASE_PORT_NAME, drv->name, 4))
+		return 1;
+
+	return 0;
 }
 
 static struct bus_type serial_base_bus_type = {
diff --git a/drivers/tty/serial/serial_ctrl.c b/drivers/tty/serial/serial_ctrl.c
--- a/drivers/tty/serial/serial_ctrl.c
+++ b/drivers/tty/serial/serial_ctrl.c
@@ -47,7 +47,7 @@ void serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port
 }
 
 static struct device_driver serial_ctrl_driver = {
-	.name = "ctrl",
+	.name = SERIAL_BASE_CTRL_NAME,
 	.suppress_bind_attrs = true,
 	.probe = serial_ctrl_probe,
 	.remove = serial_ctrl_remove,
diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c
--- a/drivers/tty/serial/serial_port.c
+++ b/drivers/tty/serial/serial_port.c
@@ -83,7 +83,7 @@ void uart_remove_one_port(struct uart_driver *drv, struct uart_port *port)
 EXPORT_SYMBOL(uart_remove_one_port);
 
 static struct device_driver serial_port_driver = {
-	.name = "port",
+	.name = SERIAL_BASE_PORT_NAME,
 	.suppress_bind_attrs = true,
 	.probe = serial_port_probe,
 	.remove = serial_port_remove,
-- 
2.41.0