On Aug 10, 2023 at 09:57:34 +0300, Tony Lindgren wrote:
> 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: 7d695d83767c ("serial: core: Fix serial_base_match() after fixing controller port name")
> Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
Please can you provide the base commit? I am unable to cleanly apply
this patch on commit: 21ef7b1e17d0 (tag: next-20230809, linux-next/master) Add linux-next specific files for 20230809
> drivers/tty/serial/serial_base.h | 1 +
> drivers/tty/serial/serial_base_bus.c | 28 +++++++++++++++++++++++++++-
> 2 files changed, 28 insertions(+), 1 deletion(-)
>
[...]
>
> struct serial_port_device {
> 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
> @@ -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;
> + unsigned int min = 0, max = ~0U;
> 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);
> }
>
> --
> 2.41.0
>
This is the issue I faced:
➜ patch -p1 < patches/20230810_tony_serial_core_fix_serial_core_port_id_including_multiport_devices.mbx
patching file drivers/tty/serial/serial_base.h
patching file drivers/tty/serial/serial_base_bus.c
Hunk #3 FAILED at 145.
1 out of 4 hunks FAILED -- saving rejects to file
drivers/tty/serial/serial_base_bus.c.rej
Perhaps this patch needs a rebase?
--
Best regards,
Dhruva Gole <d-gole@xxxxxx>
