linux-kernel - Re: [PATCH] Fix a hard coding style when determining if a device is a container.

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Date:	Fri, 12 Oct 2012 19:10:46 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	<bhelgaas@...gle.com>, <lenb@...nel.org>, <yinghai@...nel.org>,
	<izumi.taku@...fujitsu.com>, <jiang.liu@...wei.com>,
	<linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix a hard coding style when determining if a device
 is a container.

Hi Tang,

2012/10/12 15:55, Tang Chen wrote:
> "ACPI0004","PNP0A05" and "PNP0A06" are all defined in array
> container_device_ids[], so use it, but not the hard coding style.

The idea is good.

> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> ---
>   drivers/acpi/container.c |   10 +++++++---
>   1 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
> index 1f9f7d7..448c0e2 100644
> --- a/drivers/acpi/container.c
> +++ b/drivers/acpi/container.c
> @@ -217,6 +217,7 @@ container_walk_namespace_cb(acpi_handle handle,
>   {
>   	char *hid = NULL;
>   	struct acpi_device_info *info;
> +	struct acpi_device_id *container_id;
>   	acpi_status status;
>   	int *action = context;
>   
> @@ -232,10 +233,13 @@ container_walk_namespace_cb(acpi_handle handle,
>   		goto end;
>   	}
>   
> -	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
> -	    strcmp(hid, "PNP0A06")) {
> -		goto end;
> +	for (container_id = container_device_ids;
> +	     container_id->id[0]; container_id++) {
> +		if (!strcmp((char *)container_id->id, hid))
> +			break;
>   	}
> +	if (!container_id->id[0])
> +		goto end;

How about prepare is_container_device() function and check whether
the device is the container device or not as below?

	if (is_container_device())
		goto end;

Thanks,
Yasuaki Ishimatsu

>   
>   	switch (*action) {
>   	case INSTALL_NOTIFY_HANDLER:
> 


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