From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:60554 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751542AbdLUJik (ORCPT ); Thu, 21 Dec 2017 04:38:40 -0500 Subject: Patch "PCI: Avoid bus reset if bridge itself is broken" has been added to the 4.4-stable tree To: david.daney@cavium.com, alex.williamson@redhat.com, alexander.levin@verizon.com, bhelgaas@google.com, gregkh@linuxfoundation.org, jglauber@cavium.com Cc: , From: Date: Thu, 21 Dec 2017 10:37:10 +0100 Message-ID: <15138490302186@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled PCI: Avoid bus reset if bridge itself is broken to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pci-avoid-bus-reset-if-bridge-itself-is-broken.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Thu Dec 21 10:35:49 CET 2017 From: David Daney Date: Fri, 8 Sep 2017 10:10:31 +0200 Subject: PCI: Avoid bus reset if bridge itself is broken From: David Daney [ Upstream commit 357027786f3523d26f42391aa4c075b8495e5d28 ] When checking to see if a PCI bus can safely be reset, we previously checked to see if any of the children had their PCI_DEV_FLAGS_NO_BUS_RESET flag set. Children marked with that flag are known not to behave well after a bus reset. Some PCIe root port bridges also do not behave well after a bus reset, sometimes causing the devices behind the bridge to become unusable. Add a check for PCI_DEV_FLAGS_NO_BUS_RESET being set in the bridge device to allow these bridges to be flagged, and prevent their secondary buses from being reset. Signed-off-by: David Daney [jglauber@cavium.com: fixed typo] Signed-off-by: Jan Glauber Signed-off-by: Bjorn Helgaas Reviewed-by: Alex Williamson Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/pci/pci.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3850,6 +3850,10 @@ static bool pci_bus_resetable(struct pci { struct pci_dev *dev; + + if (bus->self && (bus->self->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)) + return false; + list_for_each_entry(dev, &bus->devices, bus_list) { if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || (dev->subordinate && !pci_bus_resetable(dev->subordinate))) Patches currently in stable-queue which might be from david.daney@cavium.com are queue-4.4/pci-avoid-bus-reset-if-bridge-itself-is-broken.patch