Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758512AbdLVKIR (ORCPT ); Fri, 22 Dec 2017 05:08:17 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:35962 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933310AbdLVI5i (ORCPT ); Fri, 22 Dec 2017 03:57:38 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicholas Piggin , Thomas Gleixner , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 4.9 096/104] cpuidle: fix broadcast control when broadcast can not be entered Date: Fri, 22 Dec 2017 09:47:02 +0100 Message-Id: <20171222084617.041387521@linuxfoundation.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171222084609.262099650@linuxfoundation.org> References: <20171222084609.262099650@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1268 Lines: 39 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nicholas Piggin [ Upstream commit f187851b9b4a76952b1158b86434563dd2031103 ] When failing to enter broadcast timer mode for an idle state that requires it, a new state is selected that does not require broadcast, but the broadcast variable remains set. This causes tick_broadcast_exit to be called despite not having entered broadcast mode. This causes the WARN_ON_ONCE(!irqs_disabled()) to trigger in some cases. It does not appear to cause problems for code today, but seems to violate the interface so should be fixed. Signed-off-by: Nicholas Piggin Reviewed-by: Thomas Gleixner Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/cpuidle/cpuidle.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -189,6 +189,7 @@ int cpuidle_enter_state(struct cpuidle_d return -EBUSY; } target_state = &drv->states[index]; + broadcast = false; } /* Take note of the planned idle state. */