Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754631AbbHJQF2 (ORCPT ); Mon, 10 Aug 2015 12:05:28 -0400 Received: from foss.arm.com ([217.140.101.70]:50408 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754327AbbHJQFX (ORCPT ); Mon, 10 Aug 2015 12:05:23 -0400 From: Javi Merino To: linux-pm@vger.kernel.org Cc: dmitry.torokhov@gmail.com, linux-kernel@vger.kernel.org, punit.agrawal@arm.com, 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> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439222692-3535-1-git-send-email-javi.merino@arm.com> References: <20150806083045.GB2640@e104805> <1439222692-3535-1-git-send-email-javi.merino@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1103 Lines: 34 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/