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authorLv Zheng <lv.zheng@intel.com>2012-11-16 01:46:28 (GMT)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-16 01:46:28 (GMT)
commitddc150f7a33ae0c9cb16eaac3641abc00f56316f (patch)
treed1b2cdfee5e7055e1dfa18d4fbb3dc16f22576ee /drivers/acpi
parent5133375bb46a0d6c3fba07097caed7aa5e629ccd (diff)
downloadlinux-ddc150f7a33ae0c9cb16eaac3641abc00f56316f.tar.xz
ACPI / PM: Add check preventing transitioning to non-D0 state from D3.
No power transitioning from D3 state up to a non-D0 state is allowed so make acpi_device_set_power() fail and complain if such a transition is attempted. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/bus.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 07a20ee..1f0d457 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -306,6 +306,12 @@ int acpi_device_set_power(struct acpi_device *device, int state)
* a lower-powered state.
*/
if (state < device->power.state) {
+ if (device->power.state >= ACPI_STATE_D3_HOT &&
+ state != ACPI_STATE_D0) {
+ printk(KERN_WARNING PREFIX
+ "Cannot transition to non-D0 state from D3\n");
+ return -ENODEV;
+ }
if (device->power.flags.power_resources) {
result = acpi_power_transition(device, state);
if (result)