linux-kernel - Re: [PATCH] ACPI / scan: Make it clear that acpi_bus

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Date:	Fri, 25 Jan 2013 09:43:32 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Toshi Kani <toshi.kani@...com>, Jiang Liu <liuj97@...il.com>
Subject: Re: [PATCH] ACPI / scan: Make it clear that acpi_bus_trim() cannot
 fail

2013/01/25 7:56, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Since acpi_bus_trim() cannot fail, change its definition to a void
> function, so that its callers don't check the return value in vain
> and update the callers.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---

Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

>
> On top of current linux-pm.git/linux-next.
>
> Thanks,
> Rafael
>
> ---
>   drivers/acpi/dock.c                |    8 ++------
>   drivers/acpi/scan.c                |   12 +++---------
>   drivers/pci/hotplug/acpiphp_glue.c |   10 +++-------
>   include/acpi/acpi_bus.h            |    2 +-
>   4 files changed, 9 insertions(+), 23 deletions(-)
>
> Index: linux-pm/drivers/acpi/scan.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/scan.c
> +++ linux-pm/drivers/acpi/scan.c
> @@ -127,13 +127,8 @@ void acpi_bus_hot_remove_device(void *co
>   	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>   		"Hot-removing device %s...\n", dev_name(&device->dev)));
>
> -	if (acpi_bus_trim(device)) {
> -		printk(KERN_ERR PREFIX
> -				"Removing device failed\n");
> -		goto err_out;
> -	}
> -
> -	/* device has been freed */
> +	acpi_bus_trim(device);
> +	/* Device node has been released. */
>   	device = NULL;
>
>   	/* power off device */
> @@ -1656,7 +1651,7 @@ static acpi_status acpi_bus_remove(acpi_
>   	return AE_OK;
>   }
>
> -int acpi_bus_trim(struct acpi_device *start)
> +void acpi_bus_trim(struct acpi_device *start)
>   {
>   	/*
>   	 * Execute acpi_bus_device_detach() as a post-order callback to detach
> @@ -1672,7 +1667,6 @@ int acpi_bus_trim(struct acpi_device *st
>   	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
>   			    acpi_bus_remove, NULL, NULL);
>   	acpi_bus_remove(start->handle, 0, NULL, NULL);
> -	return 0;
>   }
>   EXPORT_SYMBOL_GPL(acpi_bus_trim);
>
> Index: linux-pm/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_bus.h
> +++ linux-pm/include/acpi/acpi_bus.h
> @@ -386,7 +386,7 @@ int acpi_bus_register_driver(struct acpi
>   void acpi_bus_unregister_driver(struct acpi_driver *driver);
>   int acpi_bus_scan(acpi_handle handle);
>   void acpi_bus_hot_remove_device(void *context);
> -int acpi_bus_trim(struct acpi_device *start);
> +void acpi_bus_trim(struct acpi_device *start);
>   acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
>   int acpi_match_device_ids(struct acpi_device *device,
>   			  const struct acpi_device_id *ids);
> Index: linux-pm/drivers/acpi/dock.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/dock.c
> +++ linux-pm/drivers/acpi/dock.c
> @@ -336,13 +336,9 @@ static struct acpi_device * dock_create_
>   static void dock_remove_acpi_device(acpi_handle handle)
>   {
>   	struct acpi_device *device;
> -	int ret;
>
> -	if (!acpi_bus_get_device(handle, &device)) {
> -		ret = acpi_bus_trim(device);
> -		if (ret)
> -			pr_debug("error removing bus, %x\n", -ret);
> -	}
> +	if (!acpi_bus_get_device(handle, &device))
> +		acpi_bus_trim(device);
>   }
>
>   /**
> Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
> +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> @@ -742,8 +742,7 @@ static int acpiphp_bus_add(struct acpiph
>   		/* this shouldn't be in here, so remove
>   		 * the bus then re-add it...
>   		 */
> -		ret_val = acpi_bus_trim(device);
> -		dbg("acpi_bus_trim return %x\n", ret_val);
> +		acpi_bus_trim(device);
>   	}
>
>   	ret_val = acpi_bus_scan(func->handle);
> @@ -772,11 +771,8 @@ static int acpiphp_bus_trim(acpi_handle
>   		return retval;
>   	}
>
> -	retval = acpi_bus_trim(device);
> -	if (retval)
> -		err("cannot remove from acpi list\n");
> -
> -	return retval;
> +	acpi_bus_trim(device);
> +	return 0;
>   }
>
>   static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
>
> --
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>


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