From mboxrd@z Thu Jan 1 00:00:00 1970 From: Javi Merino Subject: [PATCH 3/3] thermal: power_allocator: exit early if there are no cooling devices Date: Mon, 10 Aug 2015 17:04:52 +0100 Message-ID: <1439222692-3535-4-git-send-email-javi.merino@arm.com> References: <20150806083045.GB2640@e104805> <1439222692-3535-1-git-send-email-javi.merino@arm.com> Return-path: In-Reply-To: <1439222692-3535-1-git-send-email-javi.merino@arm.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-pm@vger.kernel.org Cc: dmitry.torokhov@gmail.com, linux-kernel@vger.kernel.org, punit.agrawal@arm.com, Javi Merino List-Id: linux-pm@vger.kernel.org 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 --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 -- 1.9.1