PM / QoS: Fix writing 'auto' to pm_qos_latency_tolerance_us

If it was already 'auto', then writing 'auto' again would
incorrectly fail.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index 7f3646e459cbacd399c6ac7520dd1e37aa2bcb10..6a1f2c7e01eacd04bd197065c15361636c7de291 100644 (file)
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -856,7 +856,10 @@ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
                struct dev_pm_qos_request *req;
 
                if (val < 0) {
-                       ret = -EINVAL;
+                       if (val == PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT)
+                               ret = 0;
+                       else
+                               ret = -EINVAL;
                        goto out;
                }
                req = kzalloc(sizeof(*req), GFP_KERNEL);