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Date: Tue, 18 Jun 2013 15:00:28 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Aaron Lu <aaron.lu@...el.com>
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 Tuesday, June 18, 2013 05:20:36 PM Aaron Lu wrote:
> 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 :-)
OK, this change can wait. I'll drop [4/4] for now.
Thanks,
Rafael
> > 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) {
> >
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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