diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 4b120cc361359760a542eaea0825365bba5e6b33..a67defd504387a2fc610be020695323947b60333 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -52,7 +52,7 @@ static suspend_state_t target_state;
/*
* Called after processes are frozen, but before we shutdown devices.
*/
-static int at91_pm_set_target(suspend_state_t state)
+static int at91_pm_begin(suspend_state_t state)
{
target_state = state;
return 0;
@@ -202,11 +202,20 @@ static int at91_pm_enter(suspend_state_t state)
return 0;
}
+/*
+ * Called right prior to thawing processes.
+ */
+static void at91_pm_end(void)
+{
+ target_state = PM_SUSPEND_ON;
+}
+
static struct platform_suspend_ops at91_pm_ops ={
- .valid = at91_pm_valid_state,
- .set_target = at91_pm_set_target,
- .enter = at91_pm_enter,
+ .valid = at91_pm_valid_state,
+ .begin = at91_pm_begin,
+ .enter = at91_pm_enter,
+ .end = at91_pm_end,
};
static int __init at91_pm_init(void)
diff --git a/arch/powerpc/platforms/52xx/lite5200_pm.c b/arch/powerpc/platforms/52xx/lite5200_pm.c
index c0f13e8deb0b482936528761e040fd8fd026e048..41c7fd91e99e5836cbaef5c7d6803334bc37a206 100644
--- a/arch/powerpc/platforms/52xx/lite5200_pm.c
+++ b/arch/powerpc/platforms/52xx/lite5200_pm.c
@@ -31,7 +31,7 @@ static int lite5200_pm_valid(suspend_state_t state)
}
}
-static int lite5200_pm_set_target(suspend_state_t state)
+static int lite5200_pm_begin(suspend_state_t state)
{
if (lite5200_pm_valid(state)) {
lite5200_pm_target_state = state;
@@ -219,12 +219,18 @@ static void lite5200_pm_finish(void)
mpc52xx_pm_finish();
}
+static void lite5200_pm_end(void)
+{
+ lite5200_pm_target_state = PM_SUSPEND_ON;
+}
+
static struct platform_suspend_ops lite5200_pm_ops = {
.valid = lite5200_pm_valid,
- .set_target = lite5200_pm_set_target,
+ .begin = lite5200_pm_begin,
.prepare = lite5200_pm_prepare,
.enter = lite5200_pm_enter,
.finish = lite5200_pm_finish,
+ .end = lite5200_pm_end,
};
int __init lite5200_pm_init(void)
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 96d23b3cfc4e70c1d8cc81d0eeea5264af3114e9..e2e4e617952b1745700075c93510bc3b359f8d7d 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -63,11 +63,11 @@ static u32 acpi_suspend_states[] = {
static int init_8259A_after_S1;
/**
- * acpi_pm_set_target - Set the target system sleep state to the state
+ * acpi_pm_begin - Set the target system sleep state to the state
* associated with given @pm_state, if supported.
*/
-static int acpi_pm_set_target(suspend_state_t pm_state)
+static int acpi_pm_begin(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
int error = 0;
@@ -164,7 +164,7 @@ static int acpi_pm_enter(suspend_state_t pm_state)
}
/**
- * acpi_pm_finish - Finish up suspend sequence.
+ * acpi_pm_finish - Instruct the platform to leave a sleep state.
*
* This is called after we wake back up (or if entering the sleep state
* failed).
@@ -190,6 +190,19 @@ static void acpi_pm_finish(void)
#endif
}
+/**
+ * acpi_pm_end - Finish up suspend sequence.
+ */
+
+static void acpi_pm_end(void)
+{
+ /*
+ * This is necessary in case acpi_pm_finish() is not called during a
+ * failing transition to a sleep state.
+ */
+ acpi_target_sleep_state = ACPI_STATE_S0;
+}
+
static int acpi_pm_state_valid(suspend_state_t pm_state)
{
u32 acpi_state;
@@ -208,10 +221,11 @@ static int acpi_pm_state_valid(suspend_state_t pm_state)
static struct platform_suspend_ops acpi_pm_ops = {
.valid = acpi_pm_state_valid,
- .set_target = acpi_pm_set_target,
+ .begin = acpi_pm_begin,
.prepare = acpi_pm_prepare,
.enter = acpi_pm_enter,
.finish = acpi_pm_finish,
+ .end = acpi_pm_end,
};
/*
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 51283e0745b36bcf1fa9878a3597777b67a2c154..a0b1dbb5919fb72de7f8bf4a2c973bf0d218b7fd 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -38,18 +38,16 @@ typedef int __bitwise suspend_state_t;
* There is the %suspend_valid_only_mem function available that can be
* assigned to this if the platform only supports mem sleep.
*
- * @set_target: Tell the platform which system sleep state is going to be
- * entered.
- * @set_target() is executed right prior to suspending devices. The
- * information conveyed to the platform code by @set_target() should be
- * disregarded by the platform as soon as @finish() is executed and if
- * @prepare() fails. If @set_target() fails (ie. returns nonzero),
+ * @begin: Initialise a transition to given system sleep state.
+ * @begin() is executed right prior to suspending devices. The information
+ * conveyed to the platform code by @begin() should be disregarded by it as
+ * soon as @end() is executed. If @begin() fails (ie. returns nonzero),
* @prepare(), @enter() and @finish() will not be called by the PM core.
* This callback is optional. However, if it is implemented, the argument
- * passed to @enter() is meaningless and should be ignored.
+ * passed to @enter() is redundant and should be ignored.
*
* @prepare: Prepare the platform for entering the system sleep state indicated
- * by @set_target().
+ * by @begin().
* @prepare() is called right after devices have been suspended (ie. the
* appropriate .suspend() method has been executed for each device) and
* before the nonboot CPUs are disabled (it is executed with IRQs enabled).
@@ -57,8 +55,8 @@ typedef int __bitwise suspend_state_t;
* error code otherwise, in which case the system cannot enter the desired
* sleep state (@enter() and @finish() will not be called in that case).
*
- * @enter: Enter the system sleep state indicated by @set_target() or
- * represented by the argument if @set_target() is not implemented.
+ * @enter: Enter the system sleep state indicated by @begin() or represented by
+ * the argument if @begin() is not implemented.
* This callback is mandatory. It returns 0 on success or a negative
* error code otherwise, in which case the system cannot enter the desired
* sleep state.
@@ -69,13 +67,22 @@ typedef int __bitwise suspend_state_t;
* This callback is optional, but should be implemented by the platforms
* that implement @prepare(). If implemented, it is always called after
* @enter() (even if @enter() fails).
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ * the platform that the system has returned to the working state or
+ * the transition to the sleep state has been aborted.
+ * This callback is optional, but should be implemented by the platforms
+ * that implement @begin(), but platforms implementing @begin() should
+ * also provide a @end() which cleans up transitions aborted before
+ * @enter().
*/
struct platform_suspend_ops {
int (*valid)(suspend_state_t state);
- int (*set_target)(suspend_state_t state);
+ int (*begin)(suspend_state_t state);
int (*prepare)(void);
int (*enter)(suspend_state_t state);
void (*finish)(void);
+ void (*end)(void);
};
#ifdef CONFIG_SUSPEND
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 050a6077ea454225f7908c11dd170c094ded16e0..d9bba452764b4c95f055bfc0a1280bb3b9484af3 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -258,10 +258,10 @@ int suspend_devices_and_enter(suspend_state_t state)
if (!suspend_ops)
return -ENOSYS;
- if (suspend_ops->set_target) {
- error = suspend_ops->set_target(state);
+ if (suspend_ops->begin) {
+ error = suspend_ops->begin(state);
if (error)
- return error;
+ goto Close;
}
suspend_console();
error = device_suspend(PMSG_SUSPEND);
@@ -294,6 +294,9 @@ int suspend_devices_and_enter(suspend_state_t state)
device_resume();
Resume_console:
resume_console();
+ Close:
+ if (suspend_ops->end)
+ suspend_ops->end();
return error;
}