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

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Message-ID: <496b56e1-1cc3-dfa3-d628-aeab62b9e60f@kernel.org>
Date:   Thu, 3 Aug 2023 07:13:33 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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: Re: [PATCH] serial: core: Fix serial_base_match() after fixing
 controller port name

On 02. 08. 23, 13:48, Tony Lindgren wrote:
> While fixing DEVNAME to be more usable, I broke serial_base_match() as
> the ctrl and port prefix for device seemed unnecessary.

It's not completely clear to me what you are actually fixing. Please 
elaborate in more detail.

> 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>

Then we are missing a Link here.

> 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"

Could you make those char[] instead? The compiler/linker will hopefully 
(will it?) de-dup the occurrences, but the arrays would look cleaner and 
safer from this POV.

>   #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,

-- 
js
suse labs