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 4.14-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-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Dec 20 18:17:52 CET 2017
From: David Daney <david.daney@xxxxxxxxxx>
Date: Fri, 8 Sep 2017 10:10:31 +0200
Subject: PCI: Avoid bus reset if bridge itself is broken
From: David Daney <david.daney@xxxxxxxxxx>
[ 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 <david.daney@xxxxxxxxxx>
[jglauber@xxxxxxxxxx: fixed typo]
Signed-off-by: Jan Glauber <jglauber@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/pci.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4356,6 +4356,10 @@ 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@xxxxxxxxxx are
queue-4.14/pci-avoid-bus-reset-if-bridge-itself-is-broken.patch