From 32a00d274e877eab3ea7ab196b75c9be5170d25e Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 25 Nov 2010 00:05:17 +0100 Subject: [PATCH] ACPI / PM: Prevent acpi_power_get_inferred_state() from making changes acpi_power_get_inferred_state() should not update device->power.state behind the back of its caller, so make it return the state via a pointer instead. Signed-off-by: Rafael J. Wysocki Signed-off-by: Len Brown --- drivers/acpi/bus.c | 3 ++- drivers/acpi/internal.h | 2 +- drivers/acpi/power.c | 12 ++++-------- 3 files changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index d68bd61072bb..a9fe8e6bc40e 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -222,7 +222,8 @@ int acpi_bus_get_power(acpi_handle handle, int *state) * indirectly (via power resources). */ if (device->power.flags.power_resources) { - result = acpi_power_get_inferred_state(device); + result = acpi_power_get_inferred_state(device, + &device->power.state); if (result) return result; } else if (device->power.flags.explicit_get) { diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index a212bfeddf8c..2cc01489dccf 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -41,7 +41,7 @@ static inline int acpi_debugfs_init(void) { return 0; } int acpi_power_init(void); int acpi_device_sleep_wake(struct acpi_device *dev, int enable, int sleep_state, int dev_state); -int acpi_power_get_inferred_state(struct acpi_device *device); +int acpi_power_get_inferred_state(struct acpi_device *device, int *state); int acpi_power_transition(struct acpi_device *device, int state); extern int acpi_power_nocheck; diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 4c9c2fb5d98f..9bd1b6044b55 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -423,19 +423,16 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev) Device Power Management -------------------------------------------------------------------------- */ -int acpi_power_get_inferred_state(struct acpi_device *device) +int acpi_power_get_inferred_state(struct acpi_device *device, int *state) { int result = 0; struct acpi_handle_list *list = NULL; int list_state = 0; int i = 0; - - if (!device) + if (!device || !state) return -EINVAL; - device->power.state = ACPI_STATE_UNKNOWN; - /* * We know a device's inferred power state when all the resources * required for a given D-state are 'on'. @@ -450,13 +447,12 @@ int acpi_power_get_inferred_state(struct acpi_device *device) return result; if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { - device->power.state = i; + *state = i; return 0; } } - device->power.state = ACPI_STATE_D3; - + *state = ACPI_STATE_D3; return 0; } -- GitLab