From patchwork Mon Dec 21 17:44:55 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 559669 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E16E1140332 for ; Tue, 22 Dec 2015 04:47:07 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751598AbbLURpa (ORCPT ); Mon, 21 Dec 2015 12:45:30 -0500 Received: from mga03.intel.com ([134.134.136.65]:25793 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751503AbbLURp1 (ORCPT ); Mon, 21 Dec 2015 12:45:27 -0500 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP; 21 Dec 2015 09:45:26 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,460,1444719600"; d="scan'208";a="876122012" Received: from dcgshare.lm.intel.com ([10.232.118.254]) by orsmga002.jf.intel.com with ESMTP; 21 Dec 2015 09:45:26 -0800 Received: by dcgshare.lm.intel.com (Postfix, from userid 1017) id AEA29E00EB; Mon, 21 Dec 2015 10:45:25 -0700 (MST) From: Keith Busch To: LKML , x86@kernel.org, linux-pci@vger.kernel.org Cc: Jiang Liu , Thomas Gleixner , Dan Williams , Bjorn Helgaas , Bryan Veal , Ingo Molnar , "H. Peter Anvin" , Martin Mares , Jon Derrick , Keith Busch Subject: [PATCHv7 1/6] msi: Relax msi_domain_alloc() to support parentless MSI irqdomains Date: Mon, 21 Dec 2015 10:44:55 -0700 Message-Id: <1450719900-2824-2-git-send-email-keith.busch@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1450719900-2824-1-git-send-email-keith.busch@intel.com> References: <1450719900-2824-1-git-send-email-keith.busch@intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Liu Jiang Previously msi_domain_alloc() assumes MSI irqdomains always have parent irqdomains, but that's not true for the new Intel VMD devices. So relax msi_domain_alloc() to support parentless MSI irqdomains. Signed-off-by: Jiang Liu Signed-off-by: Keith Busch --- kernel/irq/msi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 6b0c0b7..5e15cb4 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -109,9 +109,11 @@ static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, if (irq_find_mapping(domain, hwirq) > 0) return -EEXIST; - ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); - if (ret < 0) - return ret; + if (domain->parent) { + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); + if (ret < 0) + return ret; + } for (i = 0; i < nr_irqs; i++) { ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);