From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756833AbbHZN1k (ORCPT ); Wed, 26 Aug 2015 09:27:40 -0400 Received: from foss.arm.com ([217.140.101.70]:45142 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756794AbbHZN12 (ORCPT ); Wed, 26 Aug 2015 09:27:28 -0400 From: Javi Merino To: linux-pm@vger.kernel.org Cc: dmitry.torokhov@gmail.com, cywang@chromium.org, linux-kernel@vger.kernel.org, punit.agrawal@arm.com, djkurtz@chromium.org, edubezval@gmail.com, Javi Merino , Zhang Rui Subject: [PATCH v4 5/5] thermal: power_allocator: exit early if there are no cooling devices Date: Wed, 26 Aug 2015 14:26:44 +0100 Message-Id: <1440595604-27197-6-git-send-email-javi.merino@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1440595604-27197-1-git-send-email-javi.merino@arm.com> References: <1439833008-26440-1-git-send-email-javi.merino@arm.com> <1440595604-27197-1-git-send-email-javi.merino@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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. Cc: Zhang Rui Cc: Eduardo Valentin Signed-off-by: Javi Merino --- 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 85ce0aac9a41..e6fdcf24ba88 100644 --- a/drivers/thermal/power_allocator.c +++ b/drivers/thermal/power_allocator.c @@ -348,6 +348,11 @@ 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 -- 1.9.1