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PCI: Enable upstream bridges even for VFs on virtual buses 

Previously we enabled the upstream PCI-to-PCI bridge only when
"dev->bus->self != NULL".  In the case of a VF on a virtual bus, where
"bus->self == NULL", we didn't enable the upstream bridge.

This fixes that by enabling the upstream bridge of the PF corresponding to
the VF.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
This commit is contained in:
Bjorn Helgaas 2013-11-06 10:00:51 -07:00
parent c6bde215ac
commit 79272138bd
1 changed files with 8 additions and 5 deletions
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13
drivers/pci/pci.c
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@ -1148,12 +1148,12 @@ int pci_reenable_device(struct pci_dev *dev)
static void pci_enable_bridge(struct pci_dev *dev)
{
struct pci_dev *bridge;
int retval;
if (!dev)
return;
pci_enable_bridge(dev->bus->self);
bridge = pci_upstream_bridge(dev);
if (bridge)
pci_enable_bridge(bridge);
if (pci_is_enabled(dev)) {
if (!dev->is_busmaster)
@ -1170,6 +1170,7 @@ static void pci_enable_bridge(struct pci_dev *dev)
static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
{
struct pci_dev *bridge;
int err;
int i, bars = 0;
@ -1188,7 +1189,9 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
if (atomic_inc_return(&dev->enable_cnt) > 1)
return 0; /* already enabled */
pci_enable_bridge(dev->bus->self);
bridge = pci_upstream_bridge(dev);
if (bridge)
pci_enable_bridge(bridge);
/* only skip sriov related */
for (i = 0; i <= PCI_ROM_RESOURCE; i++)