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[3/3] thermal: power_allocator: exit early if there are no cooling devices

Message ID 1439222692-3535-4-git-send-email-javi.merino@arm.com (mailing list archive)
State Superseded, archived
Headers show

Commit Message

Javi Merino Aug. 10, 2015, 4:04 p.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(+)
diff mbox

Patch

diff --git a/drivers/thermal/power_allocator.c b/drivers/thermal/power_allocator.c
index cb3183ec364f..58128ce11ec9 100644
--- a/drivers/thermal/power_allocator.c
+++ b/drivers/thermal/power_allocator.c
@@ -287,6 +287,11 @@  static int allocate_power(struct thermal_zone_device *tz,
 		}
 	}
 
+	if (!num_actors) {
+		ret = -ENODEV;
+		goto unlock;
+	}
+
 	/*
 	 * We need to allocate three arrays of the same size:
 	 * req_power, max_power and granted_power.  They are going to