On Thu, Oct 29, 2015 at 05:23:22PM -0500, Bjorn Helgaas wrote:
>From: Alexander Duyck <[email protected]>
>
>Per sec 3.3.3.1 of the SR-IOV spec, r1.1, we must allow 1.0s after clearing
>VF Enable before reading any field in the SR-IOV Extended Capability.
>
>Wait 1 second before calling pci_iov_set_numvfs(), which reads
>PCI_SRIOV_VF_OFFSET and PCI_SRIOV_VF_STRIDE after it sets PCI_SRIOV_NUM_VF.
>
>[bhelgaas: split to separate patch for reviewability, add spec reference]
>Signed-off-by: Alexander Duyck <[email protected]>
>Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Wei Yang <[email protected]>
>---
> drivers/pci/iov.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
>index fada98d..24428d5 100644
>--- a/drivers/pci/iov.c
>+++ b/drivers/pci/iov.c
>@@ -339,13 +339,13 @@ failed:
> iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
> pci_cfg_access_lock(dev);
> pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
>- pci_iov_set_numvfs(dev, 0);
> ssleep(1);
> pci_cfg_access_unlock(dev);
>
> if (iov->link != dev->devfn)
> sysfs_remove_link(&dev->dev.kobj, "dep_link");
>
>+ pci_iov_set_numvfs(dev, 0);
> return rc;
> }
>
--
Richard Yang
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