From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com ([134.134.136.65]:13895 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753018AbcFBIRX (ORCPT ); Thu, 2 Jun 2016 04:17:23 -0400 From: Mika Westerberg To: Bjorn Helgaas , "Rafael J. Wysocki" Cc: Qipeng Zha , Qi Zheng , Dave Airlie , Mathias Nyman , Greg Kroah-Hartman , Lukas Wunner , Andreas Noever , Peter Wu , Valdis Kletnieks , Mika Westerberg , linux-pci@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v6 4/5] ACPI / hotplug / PCI: Runtime resume bridge before rescan Date: Thu, 2 Jun 2016 11:17:14 +0300 Message-Id: <1464855435-32960-5-git-send-email-mika.westerberg@linux.intel.com> In-Reply-To: <1464855435-32960-1-git-send-email-mika.westerberg@linux.intel.com> References: <1464855435-32960-1-git-send-email-mika.westerberg@linux.intel.com> Sender: linux-pci-owner@vger.kernel.org List-ID: If a PCI bridge (or PCIe port) that is runtime suspended gets an ACPI hotplug event, such as BUS_CHECK we need to make sure it is resumed before devices below the bridge are re-scanned. Otherwise the devices behind the port are not accessible and will be treated as hot-unplugged. To fix this, resume PCI bridges from runtime suspend while rescanning. Signed-off-by: Mika Westerberg --- drivers/pci/hotplug/acpiphp_glue.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index fa49f9143b80..6a33ddcfa20b 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -675,6 +675,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) if (bridge->is_going_away) return; + pm_runtime_get_sync(&bridge->pci_dev->dev); + list_for_each_entry(slot, &bridge->slots, node) { struct pci_bus *bus = slot->bus; struct pci_dev *dev, *tmp; @@ -694,6 +696,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) disable_slot(slot); } } + + pm_runtime_put(&bridge->pci_dev->dev); } /* -- 2.8.1