linux-kernel - Re: [PATCH 1/16] ACPI: Separate adding ACPI device objects from probing ACPI drivers

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Message-ID: <20130111200046.GB13897@intel.com>
Date:	Fri, 11 Jan 2013 22:00:46 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing0307@...il.com>,
	Jiang Liu <liuj97@...il.com>
Subject: Re: [PATCH 1/16] ACPI: Separate adding ACPI device objects from
 probing ACPI drivers

(Sorry to jump in late but I noticed one problem with this series while
testing).

On Thu, Dec 20, 2012 at 02:47:47AM +0100, Rafael J. Wysocki wrote:
> +static acpi_status acpi_bus_probe_start(acpi_handle handle, u32 lvl,
> +					void *context, void **not_used)
> +{
> +	struct acpi_bus_ops *ops = context;
> +	acpi_status status = AE_OK;
> +	struct acpi_device *device;
> +	unsigned long long sta_not_used;
> +	int type_not_used;
> +
> +	/*
> +	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
> +	 * namespace walks prematurely.
> +	 */
> +	if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
> +		return AE_OK;
> +
> +	if (acpi_bus_get_device(handle, &device))
> +		return AE_CTRL_DEPTH;
> +
> +	if (ops->acpi_op_add) {
> +		if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
> +			/* This is a known good platform device. */
> +			acpi_create_platform_device(device);
> +		} else if (device_attach(&device->dev)) {

device_attach() returns 1 if it succeeds to attach device to a driver. In
that case we should continue and not return AE_CTRL_DEPTH, right?

> +			status = AE_CTRL_DEPTH;
> +		}
> +	} else if (ops->acpi_op_start) {
> +		if (ACPI_FAILURE(acpi_start_single_object(device)))
> +			status = AE_CTRL_DEPTH;
> +	}
> +	return status;
> +}
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