linux-kernel - Re: [PATCH v1] ACPI: bus: Introduce acpi_bus_for_each

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Date:   Wed, 2 Mar 2022 13:21:49 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] ACPI: bus: Introduce acpi_bus_for_each_dev()

On Tue, Feb 22, 2022 at 08:51:42PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> In order to avoid exposing acpi_bus_type to modules, introduce an
> acpi_bus_for_each_dev() helper for iterating over all ACPI device
> objects and make typec_link_ports() use it instead of the raw
> bus_for_each_dev() along with acpi_bus_type.
> 
> Having done that, drop the acpi_bus_type export.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

FWIW:

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/acpi/bus.c              |    7 ++++++-
>  drivers/usb/typec/port-mapper.c |    2 +-
>  include/acpi/acpi_bus.h         |    2 ++
>  3 files changed, 9 insertions(+), 2 deletions(-)
> 
> Index: linux-pm/drivers/acpi/bus.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/bus.c
> +++ linux-pm/drivers/acpi/bus.c
> @@ -1043,7 +1043,12 @@ struct bus_type acpi_bus_type = {
>  	.remove		= acpi_device_remove,
>  	.uevent		= acpi_device_uevent,
>  };
> -EXPORT_SYMBOL_GPL(acpi_bus_type);
> +
> +int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
> +{
> +	return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
> +}
> +EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
>  
>  /* --------------------------------------------------------------------------
>                               Initialization/Cleanup
> Index: linux-pm/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_bus.h
> +++ linux-pm/include/acpi/acpi_bus.h
> @@ -480,6 +480,8 @@ void acpi_initialize_hp_context(struct a
>  /* acpi_device.dev.bus == &acpi_bus_type */
>  extern struct bus_type acpi_bus_type;
>  
> +int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data);
> +
>  /*
>   * Events
>   * ------
> Index: linux-pm/drivers/usb/typec/port-mapper.c
> ===================================================================
> --- linux-pm.orig/drivers/usb/typec/port-mapper.c
> +++ linux-pm/drivers/usb/typec/port-mapper.c
> @@ -59,7 +59,7 @@ int typec_link_ports(struct typec_port *
>  	if (!has_acpi_companion(&con->dev))
>  		return 0;
>  
> -	bus_for_each_dev(&acpi_bus_type, NULL, &arg, typec_port_match);
> +	acpi_bus_for_each_dev(typec_port_match, &arg);
>  	if (!arg.match)
>  		return 0;
>  
> 
> 

-- 
heikki