On Wednesday, January 20, 2016 08:29:26 PM Aleksey Makarov wrote:
> Factor out the code that finds the first physical device
> of a given ACPI device. It is used in several places.
>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
I guess the above doesn't apply any more, does it?
> Signed-off-by: Aleksey Makarov <aleksey.makarov@xxxxxxxxxx>
> ---
> drivers/acpi/acpi_platform.c | 19 ++-----------------
> drivers/acpi/bus.c | 33 ++++++++++++++++++++++-----------
> drivers/acpi/internal.h | 1 +
> 3 files changed, 25 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
> index 296b7a1..c3af108 100644
> --- a/drivers/acpi/acpi_platform.c
> +++ b/drivers/acpi/acpi_platform.c
> @@ -43,7 +43,6 @@ static const struct acpi_device_id forbidden_id_list[] = {
> struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
> {
> struct platform_device *pdev = NULL;
> - struct acpi_device *acpi_parent;
> struct platform_device_info pdevinfo;
> struct resource_entry *rentry;
> struct list_head resource_list;
> @@ -82,22 +81,8 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
> * attached to it, that physical device should be the parent of the
> * platform device we are about to create.
> */
> - pdevinfo.parent = NULL;
> - acpi_parent = adev->parent;
> - if (acpi_parent) {
> - struct acpi_device_physical_node *entry;
> - struct list_head *list;
> -
> - mutex_lock(&acpi_parent->physical_node_lock);
> - list = &acpi_parent->physical_node_list;
> - if (!list_empty(list)) {
> - entry = list_first_entry(list,
> - struct acpi_device_physical_node,
> - node);
> - pdevinfo.parent = entry->dev;
> - }
> - mutex_unlock(&acpi_parent->physical_node_lock);
> - }
> + pdevinfo.parent = adev->parent ?
> + acpi_get_first_physical_node(adev->parent) : NULL;
> pdevinfo.name = dev_name(&adev->dev);
> pdevinfo.id = -1;
> pdevinfo.res = resources;
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index a212cef..832b26d 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -478,24 +478,35 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
> Device Matching
> -------------------------------------------------------------------------- */
>
> -static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
> - const struct device *dev)
> +/**
> + * acpi_device_fix_parent - Get first physical node of an ACPI device
Please fix the function name here.
> + * @adev: ACPI device in question
> + */
> +struct device *acpi_get_first_physical_node(struct acpi_device *adev)
> {
> struct mutex *physical_node_lock = &adev->physical_node_lock;
> + struct device *node = NULL;
>
> mutex_lock(physical_node_lock);
> - if (list_empty(&adev->physical_node_list)) {
> - adev = NULL;
> - } else {
> - const struct acpi_device_physical_node *node;
>
> + if (!list_empty(&adev->physical_node_list))
> node = list_first_entry(&adev->physical_node_list,
> - struct acpi_device_physical_node, node);
> - if (node->dev != dev)
> - adev = NULL;
> - }
> + struct acpi_device_physical_node, node)->dev;
> +
No, you don't have to change all that code.
Exercise: rework this function with as few lines of code changed as you possibly can.
> mutex_unlock(physical_node_lock);
> - return adev;
> +
> + return node;
> +}
> +
> +static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
> + const struct device *dev)
> +{
> + const struct device *node = acpi_get_first_physical_node(adev);
s/node/phys_dev/ ?
> +
> + if (node && node == dev)
> + return adev;
> +
> + return NULL;
return phys_dev && phys_dev == dev ? adev : NULL;
One line of code instead of 4.
> }
>
> /**
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 11d87bf..ee9312ba 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -98,6 +98,7 @@ bool acpi_device_is_present(struct acpi_device *adev);
> bool acpi_device_is_battery(struct acpi_device *adev);
> bool acpi_device_is_first_physical_node(struct acpi_device *adev,
> const struct device *dev);
> +struct device *acpi_get_first_physical_node(struct acpi_device *adev);
>
> /* --------------------------------------------------------------------------
> Device Matching and Notification
>
Thanks,
Rafael
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