From patchwork Fri Jul 4 08:16:54 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yijing Wang X-Patchwork-Id: 367041 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 B536E14009C for ; Fri, 4 Jul 2014 18:17:15 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751163AbaGDIRO (ORCPT ); Fri, 4 Jul 2014 04:17:14 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:36293 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752424AbaGDIRN (ORCPT ); Fri, 4 Jul 2014 04:17:13 -0400 Received: from 172.24.2.119 (EHLO szxeml452-hub.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BYE19060; Fri, 04 Jul 2014 16:17:06 +0800 (CST) Received: from localhost (10.177.27.212) by szxeml452-hub.china.huawei.com (10.82.67.195) with Microsoft SMTP Server id 14.3.158.1; Fri, 4 Jul 2014 16:16:55 +0800 From: Yijing Wang To: Bjorn Helgaas CC: , Wuyun , Xinwei Hu , Yijing Wang Subject: [PATCH 4/5] PCI/MSI: Retrieve first MSI irq from msi_desc rather than pci_dev Date: Fri, 4 Jul 2014 16:16:54 +0800 Message-ID: <1404461814-9936-1-git-send-email-wangyijing@huawei.com> X-Mailer: git-send-email 1.7.11.msysgit.1 MIME-Version: 1.0 X-Originating-IP: [10.177.27.212] X-CFilter-Loop: Reflected Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Retrieve the first MSi irq to compute the MSI index from struct msi_desc rather than the pci device, avoid a additional memory access. Signed-off-by: Yijing Wang --- drivers/pci/msi.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 86578bb..7f803e9 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -235,7 +235,7 @@ static void msi_set_mask_bit(struct irq_data *data, u32 flag) msix_mask_irq(desc, flag); readl(desc->mask_base); /* Flush write to device */ } else { - unsigned offset = data->irq - desc->dev->irq; + unsigned offset = data->irq - desc->irq; msi_mask_irq(desc, 1 << offset, flag << offset); } }