From: Rafael J. Wysocki <rjw@xxxxxxx> Commit 3e384ee6c687cb397581ee8f9440fc8220cfac80 (ACPI / PM: Fix reference counting of power resources) introduced a regression by causing fan power resources to be turned on and reference counted unnecessarily during resume, so on some boxes fans are always on after resume. Fix the problem by checking if the current device state is different from the new state before reference counting and turning on power resources in acpi_power_transition(). Addresses https://bugzilla.kernel.org/show_bug.cgi?id=22932 . Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> Reported-and-tested-by: Maciej Rutecki <maciej.rutecki@xxxxxxxxx> Signed-off-by: Len Brown <len.brown@xxxxxxxxx> --- drivers/acpi/power.c | 8 +++----- 1 files changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 67dedee..792a830 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -465,10 +465,12 @@ int acpi_power_transition(struct acpi_device *device, int state) struct acpi_handle_list *tl = NULL; /* Target Resources */ int i = 0; - if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) return -EINVAL; + if (device->power.state == state) + return 0; + if ((device->power.state < ACPI_STATE_D0) || (device->power.state > ACPI_STATE_D3)) return -ENODEV; @@ -488,10 +490,6 @@ int acpi_power_transition(struct acpi_device *device, int state) goto end; } - if (device->power.state == state) { - goto end; - } - /* * Then we dereference all power resources used in the current list. */ -- 1.7.3.3.480.g2f76a -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
