From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753359AbcALUT3 (ORCPT ); Tue, 12 Jan 2016 15:19:29 -0500 Received: from mga11.intel.com ([192.55.52.93]:16365 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753142AbcALUSO (ORCPT ); Tue, 12 Jan 2016 15:18:14 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,285,1449561600"; d="scan'208";a="889155662" From: Keith Busch To: LKML , x86@kernel.org, linux-pci@vger.kernel.org, Thomas Gleixner , Bjorn Helgaas Cc: Dan Williams , Bryan Veal , Jon Derrick , Liu Jiang , Keith Busch Subject: [PATCHv8 1/5] msi: Relax msi_domain_alloc() to support parentless MSI irqdomains Date: Tue, 12 Jan 2016 13:18:06 -0700 Message-Id: <1452629890-17542-2-git-send-email-keith.busch@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1452629890-17542-1-git-send-email-keith.busch@intel.com> References: <1452629890-17542-1-git-send-email-keith.busch@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 15b249e..38e89ce 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); -- 2.6.2.307.g37023ba