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serial: core: Fix serial core port id, including multiport devices

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We want to fix the serial core port DEVNAME to use a port id of the
hardware specific controller port instance instead of the port->line.

For example, the 8250 driver sets up a number of serial8250 ports
initially that can be inherited by the hardware specific driver. At that
the port->line no longer decribes the port's relation to the serial core
controller instance.

Let's fix the issue by assigning port->port_id for each serial core
controller port instance.

Fixes: 7d695d8376 ("serial: core: Fix serial_base_match() after fixing controller port name")
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230811103648.2826-1-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tony Lindgren 2023-08-11 13:36:45 +03:00 committed by Greg Kroah-Hartman
parent 3d9e6f556e
commit 04c7f60ca4
2 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/tty/serial/serial_base.h
View File

@ -16,6 +16,7 @@ struct device;
struct serial_ctrl_device {
struct device dev;
struct ida port_ida;
};
struct serial_port_device {

28
drivers/tty/serial/serial_base_bus.c
View File

@ -10,6 +10,7 @@
#include <linux/container_of.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/serial_core.h>
#include <linux/slab.h>
@ -112,6 +113,8 @@ struct serial_ctrl_device *serial_base_ctrl_add(struct uart_port *port,
if (!ctrl_dev)
return ERR_PTR(-ENOMEM);
ida_init(&ctrl_dev->port_ida);
err = serial_base_device_init(port, &ctrl_dev->dev,
parent, &serial_ctrl_type,
serial_base_ctrl_release,
@ -142,16 +145,31 @@ struct serial_port_device *serial_base_port_add(struct uart_port *port,
struct serial_ctrl_device *ctrl_dev)
{
struct serial_port_device *port_dev;
int min = 0, max = -1; /* Use -1 for max to apply IDA defaults */
int err;
port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
if (!port_dev)
return ERR_PTR(-ENOMEM);
/* Device driver specified port_id vs automatic assignment? */
if (port->port_id) {
min = port->port_id;
max = port->port_id;
}
err = ida_alloc_range(&ctrl_dev->port_ida, min, max, GFP_KERNEL);
if (err < 0) {
kfree(port_dev);
return ERR_PTR(err);
}
port->port_id = err;
err = serial_base_device_init(port, &port_dev->dev,
&ctrl_dev->dev, &serial_port_type,
serial_base_port_release,
port->ctrl_id, port->line);
port->ctrl_id, port->port_id);
if (err)
goto err_put_device;
@ -165,16 +183,24 @@ struct serial_port_device *serial_base_port_add(struct uart_port *port,
err_put_device:
put_device(&port_dev->dev);
ida_free(&ctrl_dev->port_ida, port->port_id);
return ERR_PTR(err);
}
void serial_base_port_device_remove(struct serial_port_device *port_dev)
{
struct serial_ctrl_device *ctrl_dev;
struct device *parent;
if (!port_dev)
return;
parent = port_dev->dev.parent;
ctrl_dev = to_serial_base_ctrl_device(parent);
device_del(&port_dev->dev);
ida_free(&ctrl_dev->port_ida, port_dev->port->port_id);
put_device(&port_dev->dev);
}