linux-kernel - Re: [PATCH v3] Fix a hard coding style when determining if a device is a container.

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Date:	Wed, 24 Oct 2012 15:03:52 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	yinghai@...nel.org, lenb@...nel.org, jiang.liu@...wei.com,
	izumi.taku@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Fix a hard coding style when determining if a device
 is a container.

On Wed, Oct 24, 2012 at 12:11 AM, Tang Chen <tangchen@...fujitsu.com> wrote:
> "ACPI0004","PNP0A05" and "PNP0A06" are all defined in array
> container_device_ids[], so use it, but not the hard coding style.
>
> Also, introduce a new api is_container_device() to determine if a
> device is a container device.
>
> change log v2 -> v3:
>
> 1. change the is_container_device()'s return value type from int to bool.

No need to keep this level of detail in the permanent git changelogs.

> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/acpi/container.c |   17 ++++++++++++++---
>  1 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
> index 1f9f7d7..69e2d6b 100644
> --- a/drivers/acpi/container.c
> +++ b/drivers/acpi/container.c
> @@ -92,6 +92,19 @@ static int is_device_present(acpi_handle handle)
>         return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
>  }
>
> +static bool is_container_device(const char *hid)
> +{
> +       const struct acpi_device_id *container_id;
> +
> +       for (container_id = container_device_ids;
> +            container_id->id[0]; container_id++) {
> +               if (!strcmp((char *)container_id->id, hid))
> +                       return true;
> +       }
> +
> +       return false;
> +}
> +
>  /*******************************************************************/
>  static int acpi_container_add(struct acpi_device *device)
>  {
> @@ -232,10 +245,8 @@ container_walk_namespace_cb(acpi_handle handle,
>                 goto end;
>         }
>
> -       if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
> -           strcmp(hid, "PNP0A06")) {
> +       if (!is_container_device(hid))
>                 goto end;
> -       }
>
>         switch (*action) {
>         case INSTALL_NOTIFY_HANDLER:
> --
> 1.7.1
>
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