From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936275AbXHLPq0 (ORCPT ); Sun, 12 Aug 2007 11:46:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S935278AbXHLPoh (ORCPT ); Sun, 12 Aug 2007 11:44:37 -0400 Received: from www.osadl.org ([213.239.205.134]:50309 "EHLO mail.tglx.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934221AbXHLPog (ORCPT ); Sun, 12 Aug 2007 11:44:36 -0400 Message-Id: <20070812152303.130044485@inhelltoy.tec.linutronix.de> References: <20070812152213.551812576@inhelltoy.tec.linutronix.de> User-Agent: quilt/0.46-1 Date: Sun, 12 Aug 2007 15:46:35 -0000 From: Thomas Gleixner To: Andrew Morton Cc: Linus Torvalds , LKML , Ingo Molnar , Stable Team , Benjamin Herrenschmidt , Jean-Baptiste Vignaud , "marcin.slusarz" , Jarek Poplawski Subject: [patch 2/3] genirq: suppress resend of level interrupts Content-Disposition: inline; filename=genirq-do-suppress-resend-of-level-type-interrupts.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Level type interrupts are resent by the interrupt hardware when they are still active at irq_enable(). Suppress the resend mechanism for interrupts marked as level. Signed-off-by: Thomas Gleixner --- kernel/irq/resend.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) Index: linux-2.6/kernel/irq/resend.c =================================================================== --- linux-2.6.orig/kernel/irq/resend.c 2007-08-12 17:18:04.000000000 +0200 +++ linux-2.6/kernel/irq/resend.c 2007-08-12 17:18:04.000000000 +0200 @@ -62,7 +62,12 @@ void check_irq_resend(struct irq_desc *d */ desc->chip->enable(irq); - if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { + /* + * We do not resend level type interrupts. Level type + * interrupts are resent by hardware when they are still + * active. + */ + if ((status & (IRQ_LEVEL | IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY; if (!desc->chip || !desc->chip->retrigger || --