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Date: Tue, 18 Jun 2013 17:20:36 +0800
From: Aaron Lu <aaron.lu@...el.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
CC: ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
Lan Tianyu <tianyu.lan@...el.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 4/4] ACPI / PM: Drop two functions that are not used any
more
On 06/14/2013 08:33 PM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Two functions defined in device_pm.c, acpi_dev_pm_add_dependent()
> and acpi_dev_pm_remove_dependent(), have no callers and may be
> dropped, so drop them.
Please hold on for a moment, I would like to discuss the ATA ACPI
binding with you and Tejun, the current binding with SCSI device tree
doesn't buy us anything but introduced some nasty consequences. I think
we should bind ACPI handle with ATA port/device, I have a draft patch
for this and will send out soon. If we go binding with ATA port/device,
then the two functions will be needed :-)
Thanks,
Aaron
>
> Moreover, they are the only functions adding entries to and removing
> entries from the power_dependent list in struct acpi_device, so drop
> that list and the loop walking it in acpi_power_resume_dependent()
> too.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> drivers/acpi/device_pm.c | 56 -----------------------------------------------
> drivers/acpi/power.c | 3 --
> drivers/acpi/scan.c | 1
> include/acpi/acpi_bus.h | 7 -----
> 4 files changed, 67 deletions(-)
>
> Index: linux-pm/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_bus.h
> +++ linux-pm/include/acpi/acpi_bus.h
> @@ -308,7 +308,6 @@ struct acpi_device {
> struct list_head physical_node_list;
> struct mutex physical_node_lock;
> DECLARE_BITMAP(physical_node_id_bitmap, ACPI_MAX_PHYSICAL_NODE);
> - struct list_head power_dependent;
> void (*remove)(struct acpi_device *);
> };
>
> @@ -461,8 +460,6 @@ acpi_status acpi_add_pm_notifier(struct
> acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
> acpi_notify_handler handler);
> int acpi_pm_device_sleep_state(struct device *, int *, int);
> -void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev);
> -void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev);
> #else
> static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
> acpi_notify_handler handler,
> @@ -482,10 +479,6 @@ static inline int acpi_pm_device_sleep_s
>
> return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3) ? m : ACPI_STATE_D0;
> }
> -static inline void acpi_dev_pm_add_dependent(acpi_handle handle,
> - struct device *depdev) {}
> -static inline void acpi_dev_pm_remove_dependent(acpi_handle handle,
> - struct device *depdev) {}
> #endif
>
> #ifdef CONFIG_PM_RUNTIME
> Index: linux-pm/drivers/acpi/device_pm.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/device_pm.c
> +++ linux-pm/drivers/acpi/device_pm.c
> @@ -994,60 +994,4 @@ void acpi_dev_pm_detach(struct device *d
> }
> }
> EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);
> -
> -/**
> - * acpi_dev_pm_add_dependent - Add physical device depending for PM.
> - * @handle: Handle of ACPI device node.
> - * @depdev: Device depending on that node for PM.
> - */
> -void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev)
> -{
> - struct acpi_device_physical_node *dep;
> - struct acpi_device *adev;
> -
> - if (!depdev || acpi_bus_get_device(handle, &adev))
> - return;
> -
> - mutex_lock(&adev->physical_node_lock);
> -
> - list_for_each_entry(dep, &adev->power_dependent, node)
> - if (dep->dev == depdev)
> - goto out;
> -
> - dep = kzalloc(sizeof(*dep), GFP_KERNEL);
> - if (dep) {
> - dep->dev = depdev;
> - list_add_tail(&dep->node, &adev->power_dependent);
> - }
> -
> - out:
> - mutex_unlock(&adev->physical_node_lock);
> -}
> -EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent);
> -
> -/**
> - * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
> - * @handle: Handle of ACPI device node.
> - * @depdev: Device depending on that node for PM.
> - */
> -void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev)
> -{
> - struct acpi_device_physical_node *dep;
> - struct acpi_device *adev;
> -
> - if (!depdev || acpi_bus_get_device(handle, &adev))
> - return;
> -
> - mutex_lock(&adev->physical_node_lock);
> -
> - list_for_each_entry(dep, &adev->power_dependent, node)
> - if (dep->dev == depdev) {
> - list_del(&dep->node);
> - kfree(dep);
> - break;
> - }
> -
> - mutex_unlock(&adev->physical_node_lock);
> -}
> -EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent);
> #endif /* CONFIG_PM */
> Index: linux-pm/drivers/acpi/power.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/power.c
> +++ linux-pm/drivers/acpi/power.c
> @@ -253,9 +253,6 @@ static void acpi_power_resume_dependent(
> list_for_each_entry(pn, &adev->physical_node_list, node)
> pm_request_resume(pn->dev);
>
> - list_for_each_entry(pn, &adev->power_dependent, node)
> - pm_request_resume(pn->dev);
> -
> mutex_unlock(&adev->physical_node_lock);
> }
>
> Index: linux-pm/drivers/acpi/scan.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/scan.c
> +++ linux-pm/drivers/acpi/scan.c
> @@ -1018,7 +1018,6 @@ int acpi_device_add(struct acpi_device *
> INIT_LIST_HEAD(&device->wakeup_list);
> INIT_LIST_HEAD(&device->physical_node_list);
> mutex_init(&device->physical_node_lock);
> - INIT_LIST_HEAD(&device->power_dependent);
>
> new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
> if (!new_bus_id) {
>
--
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