VF BARs are read-only zeroes according to SRIOV spec, the normal way(writing BARs) of allocating resources wouldn't be applied to VFs. The VFs' resources would be allocated when we enable SR-IOV capability. So we should not try to reassign alignment after we enable VFs. It's meaningless and will release the allocated resources which leads to a bug. Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx> --- drivers/pci/pci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index be8f72c..6ae02de 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4822,6 +4822,10 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) resource_size_t align, size; u16 command; + /* We should never try to reassign VF's alignment */ + if (dev->is_virtfn) + return; + /* check if specified PCI is target device to reassign */ align = pci_specified_resource_alignment(dev); if (!align) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
