From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C79FC2B9F4 for ; Mon, 28 Jun 2021 15:22:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 438756197F for ; Mon, 28 Jun 2021 15:22:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238008AbhF1PYO (ORCPT ); Mon, 28 Jun 2021 11:24:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:36516 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235081AbhF1PAU (ORCPT ); Mon, 28 Jun 2021 11:00:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A3D7561D68; Mon, 28 Jun 2021 14:40:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624891253; bh=EJZLGpjTtRR6ym3kna16a+tjc2iTkuIEZ1NUSj3UT6c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KS5IyTOaIzFwbtKP2y/7mgx9p8TEiILiF4yYersT+j2p4GxH+KgkG3Z/qRL3cvc6S EajAbymAYKeLpiJpO8IHGYmrangDD3ynC4KB/aw/UK/sQpnCt9GqWAsLgLaBPzlw+V 6N/4xqiiVOjz7lcArgJH51noEJdREbzE1nP6JcUJoTAauIOYGxo6Kvtz/ZDdoWM/f2 sHia8/Ti0K0iWDfEJ7wSxfJ8qwHryRCPICYE0sARSXQfWn/MSl27tsqJQfqDw0ogMI qYd5GPeh/1uWB/9OeFF+36G8NrPlyifHWm44rtRRPy3vgXyUqS4aGiO6B8mNvtJXlj c9K6w9x3Q+BAQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Rafael J. Wysocki" , Michael , Salvatore Bonaccorso , Sasha Levin Subject: [PATCH 4.9 55/71] Revert "PCI: PM: Do not read power state in pci_enable_device_flags()" Date: Mon, 28 Jun 2021 10:39:47 -0400 Message-Id: <20210628144003.34260-56-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210628144003.34260-1-sashal@kernel.org> References: <20210628144003.34260-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.9.274-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-4.9.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 4.9.274-rc1 X-KernelTest-Deadline: 2021-06-30T14:39+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Rafael J. Wysocki" [ Upstream commit 4d6035f9bf4ea12776322746a216e856dfe46698 ] Revert commit 4514d991d992 ("PCI: PM: Do not read power state in pci_enable_device_flags()") that is reported to cause PCI device initialization issues on some systems. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213481 Link: https://lore.kernel.org/linux-acpi/YNDoGICcg0V8HhpQ@eldamar.lan Reported-by: Michael Reported-by: Salvatore Bonaccorso Fixes: 4514d991d992 ("PCI: PM: Do not read power state in pci_enable_device_flags()") Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/pci/pci.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index acd89fa9820c..e09653c73ab4 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1378,11 +1378,21 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags) int err; int i, bars = 0; - if (atomic_inc_return(&dev->enable_cnt) > 1) { - pci_update_current_state(dev, dev->current_state); - return 0; /* already enabled */ + /* + * Power state could be unknown at this point, either due to a fresh + * boot or a device removal call. So get the current power state + * so that things like MSI message writing will behave as expected + * (e.g. if the device really is in D0 at enable time). + */ + if (dev->pm_cap) { + u16 pmcsr; + pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); + dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); } + if (atomic_inc_return(&dev->enable_cnt) > 1) + return 0; /* already enabled */ + bridge = pci_upstream_bridge(dev); if (bridge) pci_enable_bridge(bridge); -- 2.30.2