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Date: Sat, 10 Nov 2012 23:26:56 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, lenb@...nel.org,
linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] ACPI / platform: use ACPI device name instead of _HID._UID
On Tuesday, November 06, 2012 02:12:51 PM Mika Westerberg wrote:
> Using _UID makes the ACPI platform bus code to depend on BIOS to get it
> right. If it doesn't we fail to create the platform device as the name
> should be unique.
>
> The ACPI core already makes an unique name when it first creates the ACPI
> device so we can use that same name as the platform device name instead of
> trusting that the BIOS sets the _UIDs correctly.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Applied to linux-pm.git/linux-next.
Thanks,
Rafael
> ---
> This was suggested by Bjorn Helgaas in another thread. The patch applies on
> top of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git
> linux-next.
>
> drivers/acpi/acpi_platform.c | 62 +++++++++++++++---------------------------
> 1 file changed, 22 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
> index a5a2346..dbb31d6 100644
> --- a/drivers/acpi/acpi_platform.c
> +++ b/drivers/acpi/acpi_platform.c
> @@ -120,25 +120,6 @@ static acpi_status acpi_platform_add_resources(struct acpi_resource *res,
> return AE_OK;
> }
>
> -static acpi_status acpi_platform_get_device_uid(struct acpi_device *adev,
> - int *uid)
> -{
> - struct acpi_device_info *info;
> - acpi_status status;
> -
> - status = acpi_get_object_info(adev->handle, &info);
> - if (ACPI_FAILURE(status))
> - return status;
> -
> - status = AE_NOT_EXIST;
> - if ((info->valid & ACPI_VALID_UID) &&
> - !kstrtoint(info->unique_id.string, 0, uid))
> - status = AE_OK;
> -
> - kfree(info);
> - return status;
> -}
> -
> /**
> * acpi_create_platform_device - Create platform device for ACPI device node
> * @adev: ACPI device node to create a platform device for.
> @@ -156,19 +137,12 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
> struct device *parent = NULL;
> struct resource_info ri;
> acpi_status status;
> - int devid;
>
> /* If the ACPI node already has a physical device attached, skip it. */
> if (adev->physical_node_count)
> return NULL;
>
> - /* Use the UID of the device as the new platform device id if found. */
> - status = acpi_platform_get_device_uid(adev, &devid);
> - if (ACPI_FAILURE(status))
> - devid = -1;
> -
> memset(&ri, 0, sizeof(ri));
> -
> /* First, count the resources. */
> status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
> acpi_platform_count_resources, &ri);
> @@ -214,8 +188,8 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
> }
> mutex_unlock(&acpi_parent->physical_node_lock);
> }
> - pdev = platform_device_register_resndata(parent, acpi_device_hid(adev),
> - devid, ri.res, ri.n, NULL, 0);
> + pdev = platform_device_register_resndata(parent, dev_name(&adev->dev),
> + -1, ri.res, ri.n, NULL, 0);
> if (IS_ERR(pdev)) {
> dev_err(&adev->dev, "platform device creation failed: %ld\n",
> PTR_ERR(pdev));
> @@ -245,17 +219,7 @@ static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
> if (adev->physical_node_count)
> return AE_OK;
>
> - if (!strcmp(pdev->name, acpi_device_hid(adev))) {
> - int devid;
> -
> - /* Check that both name and UID match if it exists */
> - status = acpi_platform_get_device_uid(adev, &devid);
> - if (ACPI_FAILURE(status))
> - devid = -1;
> -
> - if (pdev->id != devid)
> - return AE_OK;
> -
> + if (!strcmp(dev_name(&pdev->dev), dev_name(&adev->dev))) {
> *(acpi_handle *)return_value = handle;
> return AE_CTRL_TERMINATE;
> }
> @@ -266,10 +230,28 @@ static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
> static int acpi_platform_find_device(struct device *dev, acpi_handle *handle)
> {
> struct platform_device *pdev = to_platform_device(dev);
> + char *name, *tmp, *hid;
> +
> + /*
> + * The platform device is named using the ACPI device name
> + * _HID:INSTANCE so we strip the INSTANCE out in order to find the
> + * correct device using its _HID.
> + */
> + name = kstrdup(dev_name(dev), GFP_KERNEL);
> + if (!name)
> + return -ENOMEM;
> +
> + tmp = name;
> + hid = strsep(&tmp, ":");
> + if (!hid) {
> + kfree(name);
> + return -ENODEV;
> + }
>
> *handle = NULL;
> - acpi_get_devices(pdev->name, acpi_platform_match, pdev, handle);
> + acpi_get_devices(hid, acpi_platform_match, pdev, handle);
>
> + kfree(name);
> return *handle ? 0 : -ENODEV;
> }
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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