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SubjectRe: [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 3)
Date
On Monday, 24 of March 2008, Alan Stern wrote:
> On Mon, 24 Mar 2008, Rafael J. Wysocki wrote:
>
> > Hi,
> >
> > This is the 3rd revision of the patch introducing new callbacks for suspend
> > and hibernation. It has been tested on x86-64.
> ...
> > * The registrations of parentless devices are disabled before the first
> > ->prepare() method is called and enabled before the first ->resume() method
> > is called
>
> It would be okay to wait until after the last prepare() method is
> called. I don't know if it makes any difference in the end, however.
>
> > +enum dpm_state {
> > + DPM_ON,
> > + DPM_RESUMING,
> > + DPM_SUSPENDING,
> > + DPM_OFF,
> > + DPM_OFF_IRQ,
> > +};
>
> Can we also have a DPM_PREPARING state, set when ->prepare() is about
> to be called? The PM core wouldn't make use of it but some drivers
> would. (I can't think of any use at all for the analogous
> DPM_COMPLETING state, however.)
>
> > @@ -68,22 +59,30 @@ int device_pm_add(struct device *dev)
> ...
> > + if (dev->parent) {
> > + if (dev->parent->power.status > DPM_RESUMING) {
>
> Clearer to say: if (dev->parent->power.status >= DPM_SUSPENDING) {
>
> ...
> > + } else if (transition_started) {
> > + /*
> > + * We refuse to register parentless devices while a PM
> > + * transition is in progress in order to avoid leaving them
> > + * unhandled down the road
> > + */
>
> Log a warning here? If this ever happened, it would be the sort of
> unexpected regression that people get all excited about.
>
> > + goto Refuse;
> > }
> ...
>
> > +static void dpm_resume(pm_message_t state)
> > +{
> > + struct list_head list;
> > +
> > + INIT_LIST_HEAD(&list);
> > + mutex_lock(&dpm_list_mtx);
> > + transition_started = false;
> > + while (!list_empty(&dpm_list)) {
> > + struct device *dev = to_device(dpm_list.next);
> > +
> > + if (dev->power.status > DPM_SUSPENDING) {
>
> Clearer to say: if (dev->power.status >= DPM_OFF) {
>
> Note that if dev->power.status is equal to DPM_SUSPENDING then you
> don't want to call resume_device(), but you still do want to change
> dev->power.status to DPM_RESUMING so that new children can be
> registered.
>
> > + dev->power.status = DPM_RESUMING;
> > + get_device(dev);
> > + mutex_unlock(&dpm_list_mtx);
> > +
> > + resume_device(dev, state);
> > +
> > + mutex_lock(&dpm_list_mtx);
> > + put_device(dev);
> > + }
> > + if (!list_empty(&dev->power.entry))
> > + list_move_tail(&dev->power.entry, &list);
>
> A little problem here: You refer to dev after calling put_device().
>
> > + }
> > + list_splice(&list, &dpm_list);
>
> This isn't the way I imagined doing it (your extra "list"), but it's
> fine.
>
> ...
> > +static void dpm_complete(pm_message_t state)
> > {
> ...
> > + complete_device(dev, state);
> > +
> > + mutex_lock(&dpm_list_mtx);
> > + put_device(dev);
> > + }
> > + if (!list_empty(&dev->power.entry))
> > + list_move(&dev->power.entry, &list);
>
> Same problem with use-after-put. Also present in dpm_prepare().
>
> > }
> > + list_splice(&list, &dpm_list);
> > mutex_unlock(&dpm_list_mtx);
> > }
>
> ...
> > static int dpm_suspend(pm_message_t state)
> > {
> ...
> > error = suspend_device(dev, state);
> > +
> > mutex_lock(&dpm_list_mtx);
> > + put_device(dev);
> > if (error) {
> > printk(KERN_ERR "Could not suspend device %s: "
> > - "error %d%s\n",
> > - kobject_name(&dev->kobj),
> > - error,
> > - (error == -EAGAIN ?
> > - " (please convert to suspend_late)" :
> > - ""));
> > - dev->power.sleeping = false;
> > + "error %d\n", kobject_name(&dev->kobj), error);
> > + list_splice_init(&dpm_list, &list);
> > break;
> > }
> > - if (!list_empty(&dev->power.entry))
> > - list_move(&dev->power.entry, &dpm_off);
> > + if (!list_empty(&dev->power.entry)) {
> > + dev->power.status = DPM_OFF;
> > + list_move(&dev->power.entry, &list);
> > + }
>
> Use-after-put again.
>
> > }
> > - if (!error)
> > - all_sleeping = true;
> > + list_splice(&list, &dpm_list);
>
> Instead you could eliminate the list_splice_init() above and put here:
>
> list_splice(&list, dpm_list->prev);
>
> This will move the entries from list to the end of dpm_list.
>
> > mutex_unlock(&dpm_list_mtx);
> > + return error;
> > +}

The patch below should address all of your comments above. It also seems to
work.

If it looks good to you, please let me know and I'll repost it in a new thread
along with the platform and PCI patches adapted to it.

Thanks,
Rafael


Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
arch/x86/kernel/apm_32.c | 4
drivers/base/power/main.c | 654 ++++++++++++++++++++++++++++++++++-----------
drivers/base/power/power.h | 2
drivers/base/power/trace.c | 4
include/linux/device.h | 8
include/linux/pm.h | 282 +++++++++++++++++--
kernel/power/disk.c | 14
kernel/power/main.c | 4
8 files changed, 772 insertions(+), 200 deletions(-)
Index: linux-2.6/include/linux/pm.h
===================================================================
--- linux-2.6.orig/include/linux/pm.h
+++ linux-2.6/include/linux/pm.h
@@ -114,7 +114,9 @@ typedef struct pm_message {
int event;
} pm_message_t;

-/*
+/**
+ * struct pm_ops - device PM callbacks
+ *
* Several driver power state transitions are externally visible, affecting
* the state of pending I/O queues and (for drivers that touch hardware)
* interrupts, wakeups, DMA, and other hardware state. There may also be
@@ -122,6 +124,254 @@ typedef struct pm_message {
* to the rest of the driver stack (such as a driver that's ON gating off
* clocks which are not in active use).
*
+ * The externally visible transitions are handled with the help of the following
+ * callbacks included in this structure:
+ *
+ * @prepare: Prepare the device for the upcoming transition, but do NOT change
+ * its hardware state. Prevent new children of the device from being
+ * registered and prevent new calls to the probe method from being made
+ * after @prepare() returns. If @prepare() detects a situation it cannot
+ * handle (e.g. registration of a child already in progress), it may return
+ * -EAGAIN, so that the PM core can execute it once again (e.g. after the
+ * new child has been registered) to recover from the race condition. This
+ * method is executed for all kinds of suspend transitions and is followed
+ * by one of the suspend callbacks: @suspend(), @freeze(), or @poweroff().
+ * The PM core executes @prepare() for all devices before starting to
+ * execute suspend callbacks for any of them, so drivers may assume all of
+ * the other devices to be present and functional while @prepare() is being
+ * executed. However, they may NOT assume anything about the availability
+ * of the user space at that time.
+ *
+ * @complete: Undo the changes made by @prepare(). This method is executed for
+ * all kinds of resume transitions, following one of the resume callbacks:
+ * @resume(), @thaw(), @restore(). Also called if the state transition
+ * fails before the driver's suspend callback (@suspend(), @freeze(),
+ * @poweroff()) can be executed (e.g. if the suspend callback fails for one
+ * of the other devices that the PM core has unsucessfully attempted to
+ * suspend earlier).
+ * The PM core executes @complete() after it has executed the appropriate
+ * resume callback for all devices.
+ *
+ * @suspend: Executed before putting the system into a sleep state in which the
+ * contents of main memory are preserved. Quiesce the device, put it into
+ * a low power state appropriate for the upcoming system state (such as
+ * PCI_D3hot), and enable wakeup events as appropriate.
+ *
+ * @resume: Executed after waking the system up from a sleep state in which the
+ * contents of main memory were preserved. Put the device into the
+ * appropriate state, according to the information saved in memory by the
+ * preceding @suspend(). The driver starts working again, responding to
+ * hardware events and software requests. The hardware may have gone
+ * through a power-off reset, or it may have maintained state from the
+ * previous suspend() which the driver may rely on while resuming. On most
+ * platforms, there are no restrictions on availability of resources like
+ * clocks during @resume().
+ *
+ * @freeze: Hibernation-specific, executed before creating a hibernation image.
+ * Quiesce operations so that a consistent image can be created, but do NOT
+ * otherwise put the device into a low power device state and do NOT emit
+ * system wakeup events. Save in main memory the device settings to be
+ * used by @restore() during the subsequent resume from hibernation or by
+ * the subsequent @thaw(), if the creation of the image or the restoration
+ * of main memory contents from it fails.
+ *
+ * @thaw: Hibernation-specific, executed after creating a hibernation image OR
+ * if the creation of the image fails. Also executed after a failing
+ * attempt to restore the contents of main memory from such an image.
+ * Undo the changes made by the preceding @freeze(), so the device can be
+ * operated in the same way as immediately before the call to @freeze().
+ *
+ * @poweroff: Hibernation-specific, executed after saving a hibernation image.
+ * Quiesce the device, put it into a low power state appropriate for the
+ * upcoming system state (such as PCI_D3hot), and enable wakeup events as
+ * appropriate.
+ *
+ * @restore: Hibernation-specific, executed after restoring the contents of main
+ * memory from a hibernation image. Driver starts working again,
+ * responding to hardware events and software requests. Drivers may NOT
+ * make ANY assumptions about the hardware state right prior to @restore().
+ * On most platforms, there are no restrictions on availability of
+ * resources like clocks during @restore().
+ *
+ * All of the above callbacks, except for @complete(), return error codes.
+ * However, the error codes returned by the resume operations, @resume(),
+ * @thaw(), and @restore(), do not cause the PM core to abort the resume
+ * transition during which they are returned.
+ */
+
+struct pm_ops {
+ int (*prepare)(struct device *dev);
+ void (*complete)(struct device *dev);
+ int (*suspend)(struct device *dev);
+ int (*resume)(struct device *dev);
+ int (*freeze)(struct device *dev);
+ int (*thaw)(struct device *dev);
+ int (*poweroff)(struct device *dev);
+ int (*restore)(struct device *dev);
+};
+
+/**
+ * struct pm_noirq_ops - device PM callbacks executed with interrupts disabled
+ *
+ * The following callbacks included in 'struct pm_noirq_ops' are executed with
+ * interrupts disabled and with the nonboot CPUs switched off:
+ *
+ * @suspend_noirq: Complete the operations of ->suspend() by carrying out any
+ * actions required for suspending the device that need interrupts to be
+ * disabled
+ *
+ * @resume_noirq: Prepare for the execution of ->resume() by carrying out any
+ * actions required for resuming the device that need interrupts to be
+ * disabled
+ *
+ * @freeze_noirq: Complete the operations of ->freeze() by carrying out any
+ * actions required for freezing the device that need interrupts to be
+ * disabled
+ *
+ * @thaw_noirq: Prepare for the execution of ->thaw() by carrying out any
+ * actions required for thawing the device that need interrupts to be
+ * disabled
+ *
+ * @poweroff_noirq: Complete the operations of ->poweroff() by carrying out any
+ * actions required for handling the device that need interrupts to be
+ * disabled
+ *
+ * @restore_noirq: Prepare for the execution of ->restore() by carrying out any
+ * actions required for restoring the operations of the device that need
+ * interrupts to be disabled
+ *
+ * All of the above callbacks, return error codes, but the error codes returned
+ * by the resume operations, @resume_noirq(), @thaw_noirq(), and
+ * @restore_noirq(), do not cause the PM core to abort the resume transition
+ * during which they are returned.
+ */
+
+struct pm_noirq_ops {
+ int (*suspend_noirq)(struct device *dev);
+ int (*resume_noirq)(struct device *dev);
+ int (*freeze_noirq)(struct device *dev);
+ int (*thaw_noirq)(struct device *dev);
+ int (*poweroff_noirq)(struct device *dev);
+ int (*restore_noirq)(struct device *dev);
+};
+
+/**
+ * PM_EVENT_ messages
+ *
+ * The following PM_EVENT_ messages are defined for the internal use of the PM
+ * core, in order to provide a mechanism allowing the high level suspend and
+ * hibernation code to convey the necessary information to the device PM core
+ * code:
+ *
+ * ON No transition.
+ *
+ * FREEZE System is going to hibernate, call ->prepare() and ->freeze()
+ * for all devices.
+ *
+ * SUSPEND System is going to suspend, call ->prepare() and ->suspend()
+ * for all devices.
+ *
+ * HIBERNATE Hibernation image has been saved, call ->prepare() and
+ * ->poweroff() for all devices.
+ *
+ * QUIESCE Contents of main memory are going to be restored from a (loaded)
+ * hibernation image, call ->prepare() and ->freeze() for all
+ * devices.
+ *
+ * RESUME System is resuming, call ->resume() and ->complete() for all
+ * devices.
+ *
+ * THAW Hibernation image has been created, call ->thaw() and
+ * ->complete() for all devices.
+ *
+ * RESTORE Contents of main memory have been restored from a hibernation
+ * image, call ->restore() and ->complete() for all devices.
+ *
+ * RECOVER Creation of a hibernation image or restoration of the main
+ * memory contents from a hibernation image has failed, call
+ * ->thaw() and ->complete() for all devices.
+ */
+
+#define PM_EVENT_ON 0x0000
+#define PM_EVENT_FREEZE 0x0001
+#define PM_EVENT_SUSPEND 0x0002
+#define PM_EVENT_HIBERNATE 0x0004
+#define PM_EVENT_QUIESCE 0x0008
+#define PM_EVENT_RESUME 0x0010
+#define PM_EVENT_THAW 0x0020
+#define PM_EVENT_RESTORE 0x0040
+#define PM_EVENT_RECOVER 0x0080
+
+#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
+
+#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
+#define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
+#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
+#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
+#define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
+#define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
+#define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })
+#define PMSG_RECOVER ((struct pm_message){ .event = PM_EVENT_RECOVER, })
+#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
+
+/**
+ * Device power management states
+ *
+ * These state labels are used internally by the PM core to indicate the current
+ * status of a device with respect to the PM core operations.
+ *
+ * DPM_ON Device is regarded as operational. Set this way
+ * initially and when ->complete() is about to be called.
+ * Also set when ->prepare() fails.
+ *
+ * DPM_PREPARING Device is going to be prepared for a PM transition. Set
+ * when ->prepare() is about to be called.
+ *
+ * DPM_RESUMING Device is going to be resumed. Set when ->resume(),
+ * ->thaw(), or ->restore() is about to be called.
+ *
+ * DPM_SUSPENDING Device has been prepared for a power transition. Set
+ * when ->prepare() has just succeeded.
+ *
+ * DPM_OFF Device is regarded as inactive. Set immediately after
+ * ->suspend(), ->freeze(), or ->poweroff() has succeeded.
+ * Also set when ->resume()_noirq, ->thaw_noirq(), or
+ * ->restore_noirq() is about to be called.
+ *
+ * DPM_OFF_IRQ Device is in a "deep sleep". Set immediately after
+ * ->suspend_noirq(), ->freeze_noirq(), or
+ * ->poweroff_noirq() has just succeeded.
+ */
+
+enum dpm_state {
+ DPM_ON,
+ DPM_PREPARING,
+ DPM_RESUMING,
+ DPM_SUSPENDING,
+ DPM_OFF,
+ DPM_OFF_IRQ,
+};
+
+struct dev_pm_info {
+ pm_message_t power_state;
+ unsigned can_wakeup:1;
+ unsigned should_wakeup:1;
+ enum dpm_state status; /* Owned by the PM core */
+#ifdef CONFIG_PM_SLEEP
+ struct list_head entry;
+#endif
+};
+
+/*
+ * The PM_EVENT_ messages are also used by drivers implementing the legacy
+ * suspend framework, based on the ->suspend() and ->resume() callbacks common
+ * for suspend and hibernation transitions, according to the rules below.
+ */
+
+/* Necessary, because several drivers use PM_EVENT_PRETHAW */
+#define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
+
+/*
* One transition is triggered by resume(), after a suspend() call; the
* message is implicit:
*
@@ -166,35 +416,11 @@ typedef struct pm_message {
* or from system low-power states such as standby or suspend-to-RAM.
*/

-#define PM_EVENT_ON 0
-#define PM_EVENT_FREEZE 1
-#define PM_EVENT_SUSPEND 2
-#define PM_EVENT_HIBERNATE 4
-#define PM_EVENT_PRETHAW 8
-
-#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
-
-#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
-#define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
-#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
-#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
-#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
-
-struct dev_pm_info {
- pm_message_t power_state;
- unsigned can_wakeup:1;
- unsigned should_wakeup:1;
- bool sleeping:1; /* Owned by the PM core */
-#ifdef CONFIG_PM_SLEEP
- struct list_head entry;
-#endif
-};
+#ifdef CONFIG_PM_SLEEP
+extern void device_power_up(pm_message_t state);
+extern void device_resume(pm_message_t state);

extern int device_power_down(pm_message_t state);
-extern void device_power_up(void);
-extern void device_resume(void);
-
-#ifdef CONFIG_PM_SLEEP
extern int device_suspend(pm_message_t state);
extern int device_prepare_suspend(pm_message_t state);

Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ linux-2.6/drivers/base/power/main.c
@@ -12,11 +12,9 @@
* and add it to the list of power-controlled devices. sysfs entries for
* controlling device power management will also be added.
*
- * A different set of lists than the global subsystem list are used to
- * keep track of power info because we use different lists to hold
- * devices based on what stage of the power management process they
- * are in. The power domain dependencies may also differ from the
- * ancestral dependencies that the subsystem list maintains.
+ * A separate list is used for keeping track of power info, because the power
+ * domain dependencies may differ from the ancestral dependencies that the
+ * subsystem list maintains.
*/

#include <linux/device.h>
@@ -30,31 +28,24 @@
#include "power.h"

/*
- * The entries in the dpm_active list are in a depth first order, simply
+ * The entries in the dpm_list list are in a depth first order, simply
* because children are guaranteed to be discovered after parents, and
* are inserted at the back of the list on discovery.
*
- * All the other lists are kept in the same order, for consistency.
- * However the lists aren't always traversed in the same order.
- * Semaphores must be acquired from the top (i.e., front) down
- * and released in the opposite order. Devices must be suspended
- * from the bottom (i.e., end) up and resumed in the opposite order.
- * That way no parent will be suspended while it still has an active
- * child.
- *
* Since device_pm_add() may be called with a device semaphore held,
* we must never try to acquire a device semaphore while holding
* dpm_list_mutex.
*/

-LIST_HEAD(dpm_active);
-static LIST_HEAD(dpm_off);
-static LIST_HEAD(dpm_off_irq);
+LIST_HEAD(dpm_list);

static DEFINE_MUTEX(dpm_list_mtx);

-/* 'true' if all devices have been suspended, protected by dpm_list_mtx */
-static bool all_sleeping;
+/*
+ * Set once the preparation of devices for a PM transition has started, reset
+ * before starting to resume devices. Protected by dpm_list_mtx.
+ */
+static bool transition_started;

/**
* device_pm_add - add a device to the list of active devices
@@ -68,22 +59,30 @@ int device_pm_add(struct device *dev)
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
mutex_lock(&dpm_list_mtx);
- if ((dev->parent && dev->parent->power.sleeping) || all_sleeping) {
- if (dev->parent->power.sleeping)
- dev_warn(dev,
- "parent %s is sleeping, will not add\n",
+ if (dev->parent) {
+ if (dev->parent->power.status >= DPM_SUSPENDING) {
+ dev_warn(dev, "parent %s is sleeping, will not add\n",
dev->parent->bus_id);
- else
- dev_warn(dev, "devices are sleeping, will not add\n");
- WARN_ON(true);
- error = -EBUSY;
- } else {
- error = dpm_sysfs_add(dev);
- if (!error)
- list_add_tail(&dev->power.entry, &dpm_active);
+ goto Refuse;
+ }
+ } else if (transition_started) {
+ /*
+ * We refuse to register parentless devices while a PM
+ * transition is in progress in order to avoid leaving them
+ * unhandled down the road
+ */
+ goto Refuse;
}
+ error = dpm_sysfs_add(dev);
+ if (!error)
+ list_add_tail(&dev->power.entry, &dpm_list);
+ End:
mutex_unlock(&dpm_list_mtx);
return error;
+ Refuse:
+ WARN_ON(true);
+ error = -EBUSY;
+ goto End;
}

/**
@@ -103,73 +102,230 @@ void device_pm_remove(struct device *dev
mutex_unlock(&dpm_list_mtx);
}

+/**
+ * pm_op - execute the PM operation appropiate for given PM event
+ * @dev: Device.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
+ */
+static int pm_op(struct device *dev, struct pm_ops *ops, pm_message_t state)
+{
+ int error = 0;
+
+ switch (state.event) {
+#ifdef CONFIG_SUSPEND
+ case PM_EVENT_SUSPEND:
+ if (ops->suspend) {
+ error = ops->suspend(dev);
+ suspend_report_result(ops->suspend, error);
+ }
+ break;
+ case PM_EVENT_RESUME:
+ if (ops->resume) {
+ error = ops->resume(dev);
+ suspend_report_result(ops->resume, error);
+ }
+ break;
+#endif /* CONFIG_SUSPEND */
+#ifdef CONFIG_HIBERNATION
+ case PM_EVENT_FREEZE:
+ case PM_EVENT_QUIESCE:
+ if (ops->freeze) {
+ error = ops->freeze(dev);
+ suspend_report_result(ops->freeze, error);
+ }
+ break;
+ case PM_EVENT_HIBERNATE:
+ if (ops->poweroff) {
+ error = ops->poweroff(dev);
+ suspend_report_result(ops->poweroff, error);
+ }
+ break;
+ case PM_EVENT_THAW:
+ case PM_EVENT_RECOVER:
+ if (ops->thaw) {
+ error = ops->thaw(dev);
+ suspend_report_result(ops->thaw, error);
+ }
+ break;
+ case PM_EVENT_RESTORE:
+ if (ops->restore) {
+ error = ops->restore(dev);
+ suspend_report_result(ops->restore, error);
+ }
+ break;
+#endif /* CONFIG_HIBERNATION */
+ default:
+ error = -EINVAL;
+ }
+ return error;
+}
+
+/**
+ * pm_noirq_op - execute the PM operation appropiate for given PM event
+ * @dev: Device.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
+ *
+ * The operation is executed with interrupts disabled by the only remaining
+ * functional CPU in the system.
+ */
+static int pm_noirq_op(struct device *dev, struct pm_noirq_ops *ops,
+ pm_message_t state)
+{
+ int error = 0;
+
+ switch (state.event) {
+#ifdef CONFIG_SUSPEND
+ case PM_EVENT_SUSPEND:
+ if (ops->suspend_noirq) {
+ error = ops->suspend_noirq(dev);
+ suspend_report_result(ops->suspend_noirq, error);
+ }
+ break;
+ case PM_EVENT_RESUME:
+ if (ops->resume_noirq) {
+ error = ops->resume_noirq(dev);
+ suspend_report_result(ops->resume_noirq, error);
+ }
+ break;
+#endif /* CONFIG_SUSPEND */
+#ifdef CONFIG_HIBERNATION
+ case PM_EVENT_FREEZE:
+ case PM_EVENT_QUIESCE:
+ if (ops->freeze_noirq) {
+ error = ops->freeze_noirq(dev);
+ suspend_report_result(ops->freeze_noirq, error);
+ }
+ break;
+ case PM_EVENT_HIBERNATE:
+ if (ops->poweroff_noirq) {
+ error = ops->poweroff_noirq(dev);
+ suspend_report_result(ops->poweroff_noirq, error);
+ }
+ break;
+ case PM_EVENT_THAW:
+ case PM_EVENT_RECOVER:
+ if (ops->thaw_noirq) {
+ error = ops->thaw_noirq(dev);
+ suspend_report_result(ops->thaw_noirq, error);
+ }
+ break;
+ case PM_EVENT_RESTORE:
+ if (ops->restore_noirq) {
+ error = ops->restore_noirq(dev);
+ suspend_report_result(ops->restore_noirq, error);
+ }
+ break;
+#endif /* CONFIG_HIBERNATION */
+ default:
+ error = -EINVAL;
+ }
+ return error;
+}
+
+static char *pm_verb(int event)
+{
+ switch (event) {
+ case PM_EVENT_SUSPEND:
+ return "suspend";
+ case PM_EVENT_RESUME:
+ return "resume";
+ case PM_EVENT_FREEZE:
+ return "freeze";
+ case PM_EVENT_QUIESCE:
+ return "quiesce";
+ case PM_EVENT_HIBERNATE:
+ return "hibernate";
+ case PM_EVENT_THAW:
+ return "thaw";
+ case PM_EVENT_RESTORE:
+ return "restore";
+ default:
+ return "(unknown PM event)";
+ }
+}
+
+static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info)
+{
+ dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
+ ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
+ ", may wakeup" : "");
+}
+
/*------------------------- Resume routines -------------------------*/

/**
- * resume_device_early - Power on one device (early resume).
+ * resume_device_noirq - Power on one device (early resume).
* @dev: Device.
+ * @state: PM transition of the system being carried out.
*
* Must be called with interrupts disabled.
*/
-static int resume_device_early(struct device *dev)
+static int resume_device_noirq(struct device *dev, pm_message_t state)
{
int error = 0;

TRACE_DEVICE(dev);
TRACE_RESUME(0);

- if (dev->bus && dev->bus->resume_early) {
- dev_dbg(dev, "EARLY resume\n");
+ if (!dev->bus)
+ goto End;
+
+ if (dev->bus->pm_noirq) {
+ pm_dev_dbg(dev, state, "EARLY ");
+ error = pm_noirq_op(dev, dev->bus->pm_noirq, state);
+ } else if (dev->bus->resume_early) {
+ pm_dev_dbg(dev, state, "legacy EARLY ");
error = dev->bus->resume_early(dev);
}
-
+ End:
TRACE_RESUME(error);
return error;
}

/**
* dpm_power_up - Power on all regular (non-sysdev) devices.
+ * @state: PM transition of the system being carried out.
*
- * Walk the dpm_off_irq list and power each device up. This
- * is used for devices that required they be powered down with
- * interrupts disabled. As devices are powered on, they are moved
- * to the dpm_off list.
+ * Execute the appropriate "noirq resume" callback for all devices marked
+ * as DPM_OFF_IRQ.
*
* Must be called with interrupts disabled and only one CPU running.
*/
-static void dpm_power_up(void)
+static void dpm_power_up(pm_message_t state)
{
+ struct device *dev;

- while (!list_empty(&dpm_off_irq)) {
- struct list_head *entry = dpm_off_irq.next;
- struct device *dev = to_device(entry);
-
- list_move_tail(entry, &dpm_off);
- resume_device_early(dev);
- }
+ list_for_each_entry(dev, &dpm_list, power.entry)
+ if (dev->power.status > DPM_OFF) {
+ dev->power.status = DPM_OFF;
+ resume_device_noirq(dev, state);
+ }
}

/**
* device_power_up - Turn on all devices that need special attention.
+ * @state: PM transition of the system being carried out.
*
* Power on system devices, then devices that required we shut them down
* with interrupts disabled.
*
* Must be called with interrupts disabled.
*/
-void device_power_up(void)
+void device_power_up(pm_message_t state)
{
sysdev_resume();
- dpm_power_up();
+ dpm_power_up(state);
}
EXPORT_SYMBOL_GPL(device_power_up);

/**
* resume_device - Restore state for one device.
* @dev: Device.
- *
+ * @state: PM transition of the system being carried out.
*/
-static int resume_device(struct device *dev)
+static int resume_device(struct device *dev, pm_message_t state)
{
int error = 0;

@@ -178,21 +334,40 @@ static int resume_device(struct device *

down(&dev->sem);

- if (dev->bus && dev->bus->resume) {
- dev_dbg(dev,"resuming\n");
- error = dev->bus->resume(dev);
+ if (dev->bus) {
+ if (dev->bus->pm) {
+ pm_dev_dbg(dev, state, "");
+ error = pm_op(dev, dev->bus->pm, state);
+ } else if (dev->bus->resume) {
+ pm_dev_dbg(dev, state, "legacy ");
+ error = dev->bus->resume(dev);
+ }
+ if (error)
+ goto End;
}

- if (!error && dev->type && dev->type->resume) {
- dev_dbg(dev,"resuming\n");
- error = dev->type->resume(dev);
+ if (dev->type) {
+ if (dev->type->pm) {
+ pm_dev_dbg(dev, state, "type ");
+ error = pm_op(dev, dev->type->pm, state);
+ } else if (dev->type->resume) {
+ pm_dev_dbg(dev, state, "legacy type ");
+ error = dev->type->resume(dev);
+ }
+ if (error)
+ goto End;
}

- if (!error && dev->class && dev->class->resume) {
- dev_dbg(dev,"class resume\n");
- error = dev->class->resume(dev);
+ if (dev->class) {
+ if (dev->class->pm) {
+ pm_dev_dbg(dev, state, "class ");
+ error = pm_op(dev, dev->class->pm, state);
+ } else if (dev->class->resume) {
+ pm_dev_dbg(dev, state, "legacy class ");
+ error = dev->class->resume(dev);
+ }
}
-
+ End:
up(&dev->sem);

TRACE_RESUME(error);
@@ -201,78 +376,157 @@ static int resume_device(struct device *

/**
* dpm_resume - Resume every device.
+ * @state: PM transition of the system being carried out.
*
- * Resume the devices that have either not gone through
- * the late suspend, or that did go through it but also
- * went through the early resume.
+ * Execute the appropriate "resume" callback for all devices the status of
+ * which indicates that they are inactive.
+ */
+static void dpm_resume(pm_message_t state)
+{
+ struct list_head list;
+
+ INIT_LIST_HEAD(&list);
+ mutex_lock(&dpm_list_mtx);
+ transition_started = false;
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.next);
+
+ get_device(dev);
+ if (dev->power.status >= DPM_OFF) {
+ dev->power.status = DPM_RESUMING;
+ mutex_unlock(&dpm_list_mtx);
+
+ resume_device(dev, state);
+
+ mutex_lock(&dpm_list_mtx);
+ } else if (dev->power.status == DPM_SUSPENDING) {
+ /* Allow new children of the device to be registered */
+ dev->power.status = DPM_RESUMING;
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move_tail(&dev->power.entry, &list);
+ put_device(dev);
+ }
+ list_splice(&list, &dpm_list);
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/**
+ * complete_device - Complete a PM transition for given device
+ * @dev: Device.
+ * @state: PM transition of the system being carried out.
+ */
+static void complete_device(struct device *dev, pm_message_t state)
+{
+ down(&dev->sem);
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->complete) {
+ pm_dev_dbg(dev, state, "completing ");
+ dev->bus->pm->complete(dev);
+ }
+
+ if (dev->type && dev->type->pm && dev->type->pm->complete) {
+ pm_dev_dbg(dev, state, "completing type ");
+ dev->type->pm->complete(dev);
+ }
+
+ if (dev->class && dev->class->pm && dev->class->pm->complete) {
+ pm_dev_dbg(dev, state, "completing class ");
+ dev->class->pm->complete(dev);
+ }
+
+ up(&dev->sem);
+}
+
+/**
+ * dpm_complete - Complete a PM transition for all devices.
+ * @state: PM transition of the system being carried out.
*
- * Take devices from the dpm_off_list, resume them,
- * and put them on the dpm_locked list.
+ * Execute the ->complete() callbacks for all devices that are not marked
+ * as DPM_ON.
*/
-static void dpm_resume(void)
+static void dpm_complete(pm_message_t state)
{
+ struct list_head list;
+
+ INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
- all_sleeping = false;
- while(!list_empty(&dpm_off)) {
- struct list_head *entry = dpm_off.next;
- struct device *dev = to_device(entry);
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.prev);

- list_move_tail(entry, &dpm_active);
- dev->power.sleeping = false;
- mutex_unlock(&dpm_list_mtx);
- resume_device(dev);
- mutex_lock(&dpm_list_mtx);
+ get_device(dev);
+ if (dev->power.status > DPM_ON) {
+ dev->power.status = DPM_ON;
+ mutex_unlock(&dpm_list_mtx);
+
+ complete_device(dev, state);
+
+ mutex_lock(&dpm_list_mtx);
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move(&dev->power.entry, &list);
+ put_device(dev);
}
+ list_splice(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx);
}

/**
* device_resume - Restore state of each device in system.
+ * @state: PM transition of the system being carried out.
*
* Resume all the devices, unlock them all, and allow new
* devices to be registered once again.
*/
-void device_resume(void)
+void device_resume(pm_message_t state)
{
might_sleep();
- dpm_resume();
+ dpm_resume(state);
+ dpm_complete(state);
}
EXPORT_SYMBOL_GPL(device_resume);


/*------------------------- Suspend routines -------------------------*/

-static inline char *suspend_verb(u32 event)
+/**
+ * resume_event - return a PM message representing the resume event
+ * corresponding to given sleep state.
+ * @sleep_state: PM message representing a sleep state.
+ */
+static pm_message_t resume_event(pm_message_t sleep_state)
{
- switch (event) {
- case PM_EVENT_SUSPEND: return "suspend";
- case PM_EVENT_FREEZE: return "freeze";
- case PM_EVENT_PRETHAW: return "prethaw";
- default: return "(unknown suspend event)";
+ switch (sleep_state.event) {
+ case PM_EVENT_SUSPEND:
+ return PMSG_RESUME;
+ case PM_EVENT_FREEZE:
+ case PM_EVENT_QUIESCE:
+ return PMSG_RECOVER;
+ case PM_EVENT_HIBERNATE:
+ return PMSG_RESTORE;
}
-}
-
-static void
-suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
-{
- dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
- ((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
- ", may wakeup" : "");
+ return PMSG_ON;
}

/**
- * suspend_device_late - Shut down one device (late suspend).
+ * suspend_device_noirq - Shut down one device (late suspend).
* @dev: Device.
- * @state: Power state device is entering.
+ * @state: PM transition of the system being carried out.
*
* This is called with interrupts off and only a single CPU running.
*/
-static int suspend_device_late(struct device *dev, pm_message_t state)
+static int suspend_device_noirq(struct device *dev, pm_message_t state)
{
int error = 0;

- if (dev->bus && dev->bus->suspend_late) {
- suspend_device_dbg(dev, state, "LATE ");
+ if (!dev->bus)
+ return 0;
+
+ if (dev->bus->pm_noirq) {
+ pm_dev_dbg(dev, state, "LATE ");
+ error = pm_noirq_op(dev, dev->bus->pm_noirq, state);
+ } else if (dev->bus->suspend_late) {
+ pm_dev_dbg(dev, state, "legacy LATE ");
error = dev->bus->suspend_late(dev, state);
suspend_report_result(dev->bus->suspend_late, error);
}
@@ -281,37 +535,32 @@ static int suspend_device_late(struct de

/**
* device_power_down - Shut down special devices.
- * @state: Power state to enter.
+ * @state: PM transition of the system being carried out.
*
- * Power down devices that require interrupts to be disabled
- * and move them from the dpm_off list to the dpm_off_irq list.
+ * Power down devices that require interrupts to be disabled.
* Then power down system devices.
*
* Must be called with interrupts disabled and only one CPU running.
*/
int device_power_down(pm_message_t state)
{
+ struct device *dev;
int error = 0;

- while (!list_empty(&dpm_off)) {
- struct list_head *entry = dpm_off.prev;
- struct device *dev = to_device(entry);
-
- error = suspend_device_late(dev, state);
+ list_for_each_entry_reverse(dev, &dpm_list, power.entry) {
+ error = suspend_device_noirq(dev, state);
if (error) {
printk(KERN_ERR "Could not power down device %s: "
"error %d\n",
kobject_name(&dev->kobj), error);
break;
}
- if (!list_empty(&dev->power.entry))
- list_move(&dev->power.entry, &dpm_off_irq);
+ dev->power.status = DPM_OFF_IRQ;
}
-
if (!error)
error = sysdev_suspend(state);
if (error)
- dpm_power_up();
+ dpm_power_up(resume_event(state));
return error;
}
EXPORT_SYMBOL_GPL(device_power_down);
@@ -319,7 +568,7 @@ EXPORT_SYMBOL_GPL(device_power_down);
/**
* suspend_device - Save state of one device.
* @dev: Device.
- * @state: Power state device is entering.
+ * @state: PM transition of the system being carried out.
*/
static int suspend_device(struct device *dev, pm_message_t state)
{
@@ -327,29 +576,43 @@ static int suspend_device(struct device

down(&dev->sem);

- if (dev->power.power_state.event) {
- dev_dbg(dev, "PM: suspend %d-->%d\n",
- dev->power.power_state.event, state.event);
- }
-
- if (dev->class && dev->class->suspend) {
- suspend_device_dbg(dev, state, "class ");
- error = dev->class->suspend(dev, state);
- suspend_report_result(dev->class->suspend, error);
+ if (dev->class) {
+ if (dev->class->pm) {
+ pm_dev_dbg(dev, state, "class ");
+ error = pm_op(dev, dev->class->pm, state);
+ } else if (dev->class->suspend) {
+ pm_dev_dbg(dev, state, "legacy class ");
+ error = dev->class->suspend(dev, state);
+ suspend_report_result(dev->class->suspend, error);
+ }
+ if (error)
+ goto End;
}

- if (!error && dev->type && dev->type->suspend) {
- suspend_device_dbg(dev, state, "type ");
- error = dev->type->suspend(dev, state);
- suspend_report_result(dev->type->suspend, error);
+ if (dev->type) {
+ if (dev->type->pm) {
+ pm_dev_dbg(dev, state, "type ");
+ error = pm_op(dev, dev->type->pm, state);
+ } else if (dev->type->suspend) {
+ pm_dev_dbg(dev, state, "legacy type ");
+ error = dev->type->suspend(dev, state);
+ suspend_report_result(dev->type->suspend, error);
+ }
+ if (error)
+ goto End;
}

- if (!error && dev->bus && dev->bus->suspend) {
- suspend_device_dbg(dev, state, "");
- error = dev->bus->suspend(dev, state);
- suspend_report_result(dev->bus->suspend, error);
+ if (dev->bus) {
+ if (dev->bus->pm) {
+ pm_dev_dbg(dev, state, "");
+ error = pm_op(dev, dev->bus->pm, state);
+ } else if (dev->bus->suspend) {
+ pm_dev_dbg(dev, state, "legacy ");
+ error = dev->bus->suspend(dev, state);
+ suspend_report_result(dev->bus->suspend, error);
+ }
}
-
+ End:
up(&dev->sem);

return error;
@@ -357,67 +620,142 @@ static int suspend_device(struct device

/**
* dpm_suspend - Suspend every device.
- * @state: Power state to put each device in.
+ * @state: PM transition of the system being carried out.
*
- * Walk the dpm_locked list. Suspend each device and move it
- * to the dpm_off list.
- *
- * (For historical reasons, if it returns -EAGAIN, that used to mean
- * that the device would be called again with interrupts disabled.
- * These days, we use the "suspend_late()" callback for that, so we
- * print a warning and consider it an error).
+ * Execute the appropriate "suspend" callbacks for all devices.
*/
static int dpm_suspend(pm_message_t state)
{
+ struct list_head list;
int error = 0;

+ INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_active)) {
- struct list_head *entry = dpm_active.prev;
- struct device *dev = to_device(entry);
-
- WARN_ON(dev->parent && dev->parent->power.sleeping);
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.prev);

- dev->power.sleeping = true;
+ get_device(dev);
mutex_unlock(&dpm_list_mtx);
+
error = suspend_device(dev, state);
+
mutex_lock(&dpm_list_mtx);
if (error) {
printk(KERN_ERR "Could not suspend device %s: "
- "error %d%s\n",
- kobject_name(&dev->kobj),
- error,
- (error == -EAGAIN ?
- " (please convert to suspend_late)" :
- ""));
- dev->power.sleeping = false;
+ "error %d\n", kobject_name(&dev->kobj), error);
+ put_device(dev);
break;
}
+ dev->power.status = DPM_OFF;
if (!list_empty(&dev->power.entry))
- list_move(&dev->power.entry, &dpm_off);
+ list_move(&dev->power.entry, &list);
+ put_device(dev);
}
- if (!error)
- all_sleeping = true;
+ list_splice(&list, dpm_list.prev);
mutex_unlock(&dpm_list_mtx);
+ return error;
+}
+
+/**
+ * prepare_device - Execute the ->prepare() callback(s) for given device.
+ * @dev: Device.
+ * @state: PM transition of the system being carried out.
+ */
+static int prepare_device(struct device *dev, pm_message_t state)
+{
+ int error = 0;
+
+ down(&dev->sem);
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) {
+ pm_dev_dbg(dev, state, "preparing ");
+ error = dev->bus->pm->prepare(dev);
+ suspend_report_result(dev->bus->pm->prepare, error);
+ if (error)
+ goto End;
+ }
+
+ if (dev->type && dev->type->pm && dev->type->pm->prepare) {
+ pm_dev_dbg(dev, state, "preparing type ");
+ error = dev->type->pm->prepare(dev);
+ suspend_report_result(dev->type->pm->prepare, error);
+ if (error)
+ goto End;
+ }
+
+ if (dev->class && dev->class->pm && dev->class->pm->prepare) {
+ pm_dev_dbg(dev, state, "preparing class ");
+ error = dev->class->pm->prepare(dev);
+ suspend_report_result(dev->class->pm->prepare, error);
+ }
+ End:
+ up(&dev->sem);
+
+ return error;
+}
+
+/**
+ * dpm_prepare - Prepare all devices for a PM transition.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the ->prepare() callback for all devices.
+ */
+static int dpm_prepare(pm_message_t state)
+{
+ struct list_head list;
+ int error = 0;
+
+ INIT_LIST_HEAD(&list);
+ mutex_lock(&dpm_list_mtx);
+ transition_started = true;
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.next);
+
+ get_device(dev);
+ dev->power.status = DPM_PREPARING;
+ mutex_unlock(&dpm_list_mtx);

+ error = prepare_device(dev, state);
+
+ mutex_lock(&dpm_list_mtx);
+ if (error) {
+ dev->power.status = DPM_ON;
+ if (error == -EAGAIN) {
+ put_device(dev);
+ continue;
+ }
+ printk(KERN_ERR "Could not prepare device %s "
+ "for suspend: error %d\n",
+ kobject_name(&dev->kobj), error);
+ put_device(dev);
+ break;
+ }
+ dev->power.status = DPM_SUSPENDING;
+ if (!list_empty(&dev->power.entry))
+ list_move_tail(&dev->power.entry, &list);
+ put_device(dev);
+ }
+ list_splice(&list, &dpm_list);
+ mutex_unlock(&dpm_list_mtx);
return error;
}

/**
* device_suspend - Save state and stop all devices in system.
- * @state: new power management state
+ * @state: PM transition of the system being carried out.
*
- * Prevent new devices from being registered, then lock all devices
- * and suspend them.
+ * Prepare and suspend all devices.
*/
int device_suspend(pm_message_t state)
{
int error;

might_sleep();
- error = dpm_suspend(state);
+ error = dpm_prepare(state);
+ if (!error)
+ error = dpm_suspend(state);
if (error)
- device_resume();
+ device_resume(resume_event(state));
return error;
}
EXPORT_SYMBOL_GPL(device_suspend);
Index: linux-2.6/include/linux/device.h
===================================================================
--- linux-2.6.orig/include/linux/device.h
+++ linux-2.6/include/linux/device.h
@@ -69,6 +69,9 @@ struct bus_type {
int (*resume_early)(struct device *dev);
int (*resume)(struct device *dev);

+ struct pm_ops *pm;
+ struct pm_noirq_ops *pm_noirq;
+
struct bus_type_private *p;
};

@@ -202,6 +205,8 @@ struct class {

int (*suspend)(struct device *dev, pm_message_t state);
int (*resume)(struct device *dev);
+
+ struct pm_ops *pm;
};

extern int __must_check class_register(struct class *class);
@@ -345,8 +350,11 @@ struct device_type {
struct attribute_group **groups;
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
void (*release)(struct device *dev);
+
int (*suspend)(struct device *dev, pm_message_t state);
int (*resume)(struct device *dev);
+
+ struct pm_ops *pm;
};

/* interface for exporting device attributes */
Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -224,7 +224,7 @@ static int create_image(int platform_mod
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
- device_power_up();
+ device_power_up(in_suspend ? PMSG_RECOVER : PMSG_RESTORE);
Enable_irqs:
local_irq_enable();
return error;
@@ -280,7 +280,7 @@ int hibernation_snapshot(int platform_mo
Finish:
platform_finish(platform_mode);
Resume_devices:
- device_resume();
+ device_resume(in_suspend ? PMSG_RECOVER : PMSG_RESTORE);
Resume_console:
resume_console();
Close:
@@ -301,7 +301,7 @@ static int resume_target_kernel(void)
int error;

local_irq_disable();
- error = device_power_down(PMSG_PRETHAW);
+ error = device_power_down(PMSG_QUIESCE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
"aborting resume\n");
@@ -329,7 +329,7 @@ static int resume_target_kernel(void)
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
- device_power_up();
+ device_power_up(PMSG_THAW);
Enable_irqs:
local_irq_enable();
return error;
@@ -350,7 +350,7 @@ int hibernation_restore(int platform_mod

pm_prepare_console();
suspend_console();
- error = device_suspend(PMSG_PRETHAW);
+ error = device_suspend(PMSG_QUIESCE);
if (error)
goto Finish;

@@ -362,7 +362,7 @@ int hibernation_restore(int platform_mod
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
- device_resume();
+ device_resume(PMSG_RECOVER);
Finish:
resume_console();
pm_restore_console();
@@ -419,7 +419,7 @@ int hibernation_platform_enter(void)
Finish:
hibernation_ops->finish();
Resume_devices:
- device_resume();
+ device_resume(PMSG_RESTORE);
Resume_console:
resume_console();
Close:
Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/kernel/power/main.c
@@ -239,7 +239,7 @@ static int suspend_enter(suspend_state_t
if (!suspend_test(TEST_CORE))
error = suspend_ops->enter(state);

- device_power_up();
+ device_power_up(PMSG_RESUME);
Done:
arch_suspend_enable_irqs();
BUG_ON(irqs_disabled());
@@ -291,7 +291,7 @@ int suspend_devices_and_enter(suspend_st
if (suspend_ops->finish)
suspend_ops->finish();
Resume_devices:
- device_resume();
+ device_resume(PMSG_RESUME);
Resume_console:
resume_console();
Close:
Index: linux-2.6/arch/x86/kernel/apm_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apm_32.c
+++ linux-2.6/arch/x86/kernel/apm_32.c
@@ -1208,9 +1208,9 @@ static int suspend(int vetoable)
if (err != APM_SUCCESS)
apm_error("suspend", err);
err = (err == APM_SUCCESS) ? 0 : -EIO;
- device_power_up();
+ device_power_up(PMSG_RESUME);
local_irq_enable();
- device_resume();
+ device_resume(PMSG_RESUME);
queue_event(APM_NORMAL_RESUME, NULL);
out:
spin_lock(&user_list_lock);
Index: linux-2.6/drivers/base/power/power.h
===================================================================
--- linux-2.6.orig/drivers/base/power/power.h
+++ linux-2.6/drivers/base/power/power.h
@@ -4,7 +4,7 @@
* main.c
*/

-extern struct list_head dpm_active; /* The active device list */
+extern struct list_head dpm_list; /* The active device list */

static inline struct device *to_device(struct list_head *entry)
{
Index: linux-2.6/drivers/base/power/trace.c
===================================================================
--- linux-2.6.orig/drivers/base/power/trace.c
+++ linux-2.6/drivers/base/power/trace.c
@@ -188,9 +188,9 @@ static int show_file_hash(unsigned int v
static int show_dev_hash(unsigned int value)
{
int match = 0;
- struct list_head * entry = dpm_active.prev;
+ struct list_head *entry = dpm_list.prev;

- while (entry != &dpm_active) {
+ while (entry != &dpm_list) {
struct device * dev = to_device(entry);
unsigned int hash = hash_string(DEVSEED, dev->bus_id, DEVHASH);
if (hash == value) {

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