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[v2,4/4] thermal: power_allocator: exit early if there are no cooling devices

Message ID 1439288493-19740-5-git-send-email-javi.merino@arm.com (mailing list archive)
State Superseded, archived
Delegated to: Eduardo Valentin
Headers show

Commit Message

Javi Merino Aug. 11, 2015, 10:21 a.m. UTC 
Don't waste cycles in the power allocator governor's throttle function
if there are no cooling devices and exit early.

This commit doesn't change any functionality, but should provide better
performance for the odd case of a thermal zone with trip points but
without cooling devices.
---
 drivers/thermal/power_allocator.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/thermal/power_allocator.c b/drivers/thermal/power_allocator.c
index 38beea721e18..05a3c2f21fa6 100644
--- a/drivers/thermal/power_allocator.c
+++ b/drivers/thermal/power_allocator.c
@@ -291,6 +291,11 @@  static int allocate_power(struct thermal_zone_device *tz,
 		}
 	}
 
+	if (!num_actors) {
+		ret = -ENODEV;
+		goto unlock;
+	}
+
 	/*
 	 * We need to allocate five arrays of the same size:
 	 * req_power, max_power, granted_power, extra_actor_power and