linux-kernel - Re: [PATCH v8 15/22] ACPI, PCI: Simplify handle_root_bridge

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Date:	Sun, 13 Jan 2013 00:42 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v8 15/22] ACPI, PCI: Simplify handle_root_bridge_removal()

On Friday, January 11, 2013 02:40:42 PM Yinghai Lu wrote:
> Tang Chen found handle_root_bridge_removal is very similiar to
> acpi_bus_hot_remove_device().
> Only difference is that it call trim two times.
> 
> Change to handle_root_bridge_removal to call trim one time and then
> use acpi_bus_hot_remove_device.

Please fold these changes into your previous patches instead of adding a new
one to modify them.

Thanks,
Rafael


> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/acpi/pci_root.c |   49 ++++++++---------------------------------------
>  1 file changed, 8 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 697ec65..8a0e2e2 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -745,56 +745,23 @@ static void handle_root_bridge_insertion(acpi_handle handle)
>  		printk(KERN_ERR "cannot add bridge to acpi list\n");
>  }
>  
> -static int acpi_root_evaluate_object(acpi_handle handle, char *cmd, int val)
> -{
> -	acpi_status status;
> -	struct acpi_object_list arg_list;
> -	union acpi_object arg;
> -
> -	arg_list.count = 1;
> -	arg_list.pointer = &arg;
> -	arg.type = ACPI_TYPE_INTEGER;
> -	arg.integer.value = val;
> -
> -	status = acpi_evaluate_object(handle, cmd, &arg_list, NULL);
> -	if (ACPI_FAILURE(status)) {
> -		pr_warn("%s: %s to %d failed\n",
> -				 __func__, cmd, val);
> -		return -1;
> -	}
> -
> -	return 0;
> -}
> -
>  static void handle_root_bridge_removal(struct acpi_device *device)
>  {
>  	int ret_val;
> -	u32 flags = 0;
> -	acpi_handle dummy_handle;
> -	acpi_handle handle = device->handle;
> +	struct acpi_eject_event *ej_event;
> +
> +	ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
> +	if (!ej_event)
> +		return;
>  
> -	if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &dummy_handle)))
> -		flags |= ROOT_BRIDGE_HAS_EJ0;
> -	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &dummy_handle)))
> -		flags |= ROOT_BRIDGE_HAS_PS3;
> +	ej_event->device = device;
> +	ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
>  
>  	/* remove pci devices at first */
>  	ret_val = acpi_bus_trim(device, 0);
>  	printk(KERN_DEBUG "acpi_bus_trim stop return %x\n", ret_val);
>  
> -	/* remove acpi devices */
> -	ret_val = acpi_bus_trim(device, 1);
> -	printk(KERN_DEBUG "acpi_bus_trim remove return %x\n", ret_val);
> -
> -	if (flags & ROOT_BRIDGE_HAS_PS3) {
> -		acpi_status status;
> -
> -		status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
> -		if (ACPI_FAILURE(status))
> -			pr_warn("%s: _PS3 failed\n", __func__);
> -	}
> -	if (flags & ROOT_BRIDGE_HAS_EJ0)
> -		acpi_root_evaluate_object(handle, "_EJ0", 1);
> +	acpi_bus_hot_remove_device(ej_event);
>  }
>  
>  static void _handle_hotplug_event_root(struct work_struct *work)
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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