From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755366AbZHMTCp (ORCPT ); Thu, 13 Aug 2009 15:02:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755346AbZHMTCo (ORCPT ); Thu, 13 Aug 2009 15:02:44 -0400 Received: from www.tglx.de ([62.245.132.106]:50978 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755343AbZHMTCn (ORCPT ); Thu, 13 Aug 2009 15:02:43 -0400 Date: Thu, 13 Aug 2009 21:02:22 +0200 (CEST) From: Thomas Gleixner To: Linus Torvalds cc: Andrew Morton , LKML , Ingo Molnar Subject: [GIT pull] genirq fixes for 2.6.31 Message-ID: User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Linus, Please pull the latest irq-fixes-for-linus git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git irq-fixes-for-linus Thanks, tglx ------------------> Thomas Gleixner (1): genirq: Prevent race between free_irq() and handle_IRQ_event() kernel/irq/handle.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 065205b..4e7f17a 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -403,8 +403,16 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action) */ if (likely(!test_bit(IRQTF_DIED, &action->thread_flags))) { + struct task_struct *tsk = action->thread; + set_bit(IRQTF_RUNTHREAD, &action->thread_flags); - wake_up_process(action->thread); + /* + * Check tsk as we might race against + * free_irq which sets action->thread + * to NULL + */ + if (tsk) + wake_up_process(tsk); } /* Fall through to add to randomness */