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| author | Jan Glauber <jglauber@cavium.com> | 2017-09-08 10:10:33 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-10-11 13:29:09 -0500 |
| commit | 33ba90aa4d4432b884fc0ed57ba9dc12eb8fa288 (patch) | |
| tree | 22311f96722e3388a71eb6577506363e86e80e26 /drivers | |
| parent | 357027786f3523d26f42391aa4c075b8495e5d28 (diff) | |
| download | linux-33ba90aa4d4432b884fc0ed57ba9dc12eb8fa288.tar.gz linux-33ba90aa4d4432b884fc0ed57ba9dc12eb8fa288.tar.bz2 linux-33ba90aa4d4432b884fc0ed57ba9dc12eb8fa288.zip | |
PCI: Avoid slot reset if bridge itself is broken
When checking to see if a PCI slot can safely be reset, we previously
checked to see if any of the children had their PCI_DEV_FLAGS_NO_BUS_RESET
flag set.
Some PCIe root port bridges do not behave well after a slot reset, and may
cause the device in the slot to become unusable.
Add a check for PCI_DEV_FLAGS_NO_BUS_RESET being set in the bridge device
to prevent the slot from being reset.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/pci.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 74f1c57ab93b..3e0557bb02c8 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4424,6 +4424,10 @@ static bool pci_slot_resetable(struct pci_slot *slot) { struct pci_dev *dev; + if (slot->bus->self && + (slot->bus->self->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)) + return false; + list_for_each_entry(dev, &slot->bus->devices, bus_list) { if (!dev->slot || dev->slot != slot) continue; |