From patchwork Thu Mar 19 18:58:06 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 6051951 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 2F8A69F2A9 for ; Thu, 19 Mar 2015 18:59:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5FA602051A for ; Thu, 19 Mar 2015 18:59:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7743D2050E for ; Thu, 19 Mar 2015 18:59:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751528AbbCSS6R (ORCPT ); Thu, 19 Mar 2015 14:58:17 -0400 Received: from mail.kernel.org ([198.145.29.136]:53862 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751281AbbCSS6N (ORCPT ); Thu, 19 Mar 2015 14:58:13 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7C11220528; Thu, 19 Mar 2015 18:58:12 +0000 (UTC) Received: from redhat.com (bzq-109-65-174-5.red.bezeqint.net [109.65.174.5]) (using TLSv1.2 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D8C5F2050E; Thu, 19 Mar 2015 18:58:08 +0000 (UTC) Date: Thu, 19 Mar 2015 19:58:06 +0100 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org, Bjorn Helgaas , linux-pci@vger.kernel.org, Fam Zheng , Yinghai Lu , Ulrich Obergfell , Rusty Russell Subject: [PATCH v2 2/4] pci: don't disable msi/msix at shutdown Message-ID: <1426786724-22241-3-git-send-email-mst@redhat.com> References: <1426786724-22241-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1426786724-22241-1-git-send-email-mst@redhat.com> X-Mailer: git-send-email 2.0.0.545.gd9cabeb X-Mutt-Fcc: =sent X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_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 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This partially reverts commit d52877c7b1afb8c37ebe17e2005040b79cb618b0: "pci/irq: let pci_device_shutdown to call pci_msi_shutdown v2" It's un-necessary now that we disable msi at start, and it actually turns out to cause problems: some device drivers don't register a level interrupt handler when they detect msi/msix capability, switching off msi while device is going causes device to assert a level interrupt which is never de-asserted, causing a kernel hang. In particular, this was observed with virtio. Cc: Yinghai Lu Cc: Ulrich Obergfell Cc: Rusty Russell Reported-by: Fam Zheng Signed-off-by: Michael S. Tsirkin --- drivers/pci/pci-driver.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 2ebd2a8..c7566f1 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -456,8 +456,6 @@ static void pci_device_shutdown(struct device *dev) if (drv && drv->shutdown) drv->shutdown(pci_dev); - pci_msi_shutdown(pci_dev); - pci_msix_shutdown(pci_dev); #ifdef CONFIG_KEXEC /*