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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-08-01 01:31:08 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-08-01 23:39:17 +0200
commit42787ed79638dc7f0f8d5c164caba1e87bfab50f (patch)
tree820e3d26cac6f1e699c4bdd709de7c4d05b17915 /drivers/acpi
parent609488bc979f99f805f34e9a32c1e3b71179d10b (diff)
downloadlinux-42787ed79638dc7f0f8d5c164caba1e87bfab50f.tar.bz2
ACPI: PM: Fix regression in acpi_device_set_power()
Commit f850a48a0799 ("ACPI: PM: Allow transitions to D0 to occur in special cases") overlooked the fact that acpi_power_transition() may change the power.state value for the target device and if that happens, it may confuse acpi_device_set_power() and cause it to omit the _PS0 evaluation which on some systems is necessary to change power states of devices from low-power to D0. Fix that by saving the current value of power.state for the target device before passing it to acpi_power_transition() and using the saved value in a subsequent check. Fixes: f850a48a0799 ("ACPI: PM: Allow transitions to D0 to occur in special cases") Reported-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Reported-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Tested-by: Mario Limonciello <mario.limonciello@dell.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/device_pm.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 28cffaaf9d82..f616b16c1f0b 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -232,13 +232,15 @@ int acpi_device_set_power(struct acpi_device *device, int state)
if (device->power.flags.power_resources)
result = acpi_power_transition(device, target_state);
} else {
+ int cur_state = device->power.state;
+
if (device->power.flags.power_resources) {
result = acpi_power_transition(device, ACPI_STATE_D0);
if (result)
goto end;
}
- if (device->power.state == ACPI_STATE_D0) {
+ if (cur_state == ACPI_STATE_D0) {
int psc;
/* Nothing to do here if _PSC is not present. */