linux-kernel - Re: [PATCH 1/3] ACPI: Introduce a new acpi handle to determine HID match.

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Message-ID: <1952961.jiv6kKxT5N@vostro.rjw.lan>
Date:	Fri, 02 Nov 2012 13:23:36 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org, Tang Chen <tangchen@...fujitsu.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/3] ACPI: Introduce a new acpi handle to determine HID match.

On Thursday, October 18, 2012 01:50:09 PM Yinghai Lu wrote:
> From: Tang Chen <tangchen@...fujitsu.com>
> 
> We need to find out if one handle is for root bridge, and install notify
> handler for it to handle pci root bus hot add.
> At that time, root bridge acpi device is not created yet.
> 
> So acpi_match_device_ids() will not work.
> 
> This patch add a function to check if new acpi handle's HID matches a list
> of IDs.  The new api use acpi_device_info instead acpi_device.
> 
> -v2: updated changelog, also check length for string info...
>      change checking sequence by moving string comaring close to for loop.
> 					- Yinghai
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-acpi@...r.kernel.org
> ---
>  drivers/acpi/scan.c     |   33 +++++++++++++++++++++++++++++++++
>  include/acpi/acpi_bus.h |    2 ++
>  2 files changed, 35 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 5dfec09..33ca993 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -312,6 +312,39 @@ int acpi_match_device_ids(struct acpi_device *device,
>  }
>  EXPORT_SYMBOL(acpi_match_device_ids);
>  
> +int acpi_match_object_info_ids(struct acpi_device_info *info,
> +			       const struct acpi_device_id *ids)
> +{
> +	const struct acpi_device_id *id;
> +	char *str;
> +	u32 len;
> +	int i;
> +
> +	len = info->hardware_id.length;
> +	if (len) {
> +		str = info->hardware_id.string;
> +		if (str)
> +			for (id = ids; id->id[0]; id++)
> +				if (!strcmp((char *)id->id, str))
> +					return 0;
> +	}
> +
> +	for (i = 0; i < info->compatible_id_list.count; i++) {
> +		len = info->compatible_id_list.ids[i].length;
> +		if (!len)
> +			continue;
> +		str = info->compatible_id_list.ids[i].string;
> +		if (!str)
> +			continue;
> +		for (id = ids; id->id[0]; id++)
> +			if (!strcmp((char *)id->id, str))
> +				return 0;
> +	}
> +
> +	return -ENOENT;
> +}
> +EXPORT_SYMBOL(acpi_match_object_info_ids);

EXPORT_SYMBOL_GPL, please?

> +
>  static void acpi_free_ids(struct acpi_device *device)
>  {
>  	struct acpi_hardware_id *id, *tmp;
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 608f92f..6ac415c 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -374,6 +374,8 @@ int acpi_bus_start(struct acpi_device *device);
>  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);
> +int acpi_match_object_info_ids(struct acpi_device_info *info,
> +			       const struct acpi_device_id *ids);
>  int acpi_create_dir(struct acpi_device *);
>  void acpi_remove_dir(struct acpi_device *);

I wonder which code path(s) is(are) going to use the new routine?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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