From patchwork Fri Jun 14 16:24:57 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 2722381 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6A150C0AB1 for ; Fri, 14 Jun 2013 16:25:44 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 62B9620322 for ; Fri, 14 Jun 2013 16:25:43 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 28CAB2031C for ; Fri, 14 Jun 2013 16:25:42 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UnWol-0000Z6-91; Fri, 14 Jun 2013 16:25:39 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UnWoi-0003lO-Rl; Fri, 14 Jun 2013 16:25:36 +0000 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UnWog-0003kt-WB for linux-arm-kernel@lists.infradead.org; Fri, 14 Jun 2013 16:25:35 +0000 Received: from e106331-lin.cambridge.arm.com (e106331-lin.cambridge.arm.com [10.1.205.41]) by cam-admin0.cambridge.arm.com (8.12.6/8.12.6) with ESMTP id r5EGP6ki019838; Fri, 14 Jun 2013 17:25:06 +0100 (BST) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] irqchip: gic: fix boot for chained gics Date: Fri, 14 Jun 2013 17:24:57 +0100 Message-Id: <1371227097-3326-1-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.8.1.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130614_122535_282519_84E9912C X-CRM114-Status: GOOD ( 11.91 ) X-Spam-Score: -7.2 (-------) Cc: Mark Rutland , Catalin Marinas , Thomas Gleixner X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP As of c0114709ed: "irqchip: gic: Perform the gic_secondary_init() call via CPU notifier", booting on a platform with chained gics (e.g. Realview EB ARM11MPCore) will result in the gic_cpu_notifier being registered twice, corrupting the cpu notifier list and rendering the platform unbootable. This patch ensures that we only register the notifier for the first gic, allowing platforms with chained gics to boot. At the same time we limit the pointlessly duplicated calls to set_smp_cross_call and set_handle_irq to the first gic registered. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: Thomas Gleixner Reviewed-by: Catalin Marinas --- drivers/irqchip/irq-gic.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index 1760ceb..1a12bdf 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -808,12 +808,13 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start, if (WARN_ON(!gic->domain)) return; + if (gic_nr == 0) { #ifdef CONFIG_SMP - set_smp_cross_call(gic_raise_softirq); - register_cpu_notifier(&gic_cpu_notifier); + set_smp_cross_call(gic_raise_softirq); + register_cpu_notifier(&gic_cpu_notifier); #endif - - set_handle_irq(gic_handle_irq); + set_handle_irq(gic_handle_irq); + } gic_chip.flags |= gic_arch_extn.flags; gic_dist_init(gic);