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authorYijing Wang <wangyijing@huawei.com>2013-07-24 09:26:12 (GMT)
committerBjorn Helgaas <bhelgaas@google.com>2013-07-30 16:35:39 (GMT)
commit19b6984e972f2aca82d3756f826ded68e0a8fef8 (patch)
tree7fd9c7284c4a5c74b17330feafc9a5914c9517cc /drivers
parent07f9b61c3915e8eb156cb4461b3946736356ad02 (diff)
downloadlinux-19b6984e972f2aca82d3756f826ded68e0a8fef8.tar.xz
PCI: Update NumVFs register when disabling SR-IOV
Currently, we only update NumVFs register during sriov_enable(). This register should also be updated during sriov_disable() and when sriov_enable() fails. Otherwise, we will get the stale "Number of VFs" info from lspci. [bhelgaas: changelog] Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/iov.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index de4034e..e73bdae 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -286,7 +286,6 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
(!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
return -EINVAL;
- pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
if (!offset || (nr_virtfn > 1 && !stride))
@@ -334,6 +333,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
return rc;
}
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
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);
@@ -368,6 +368,7 @@ 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_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0);
ssleep(1);
pci_cfg_access_unlock(dev);
@@ -401,6 +402,7 @@ static void sriov_disable(struct pci_dev *dev)
sysfs_remove_link(&dev->dev.kobj, "dep_link");
iov->num_VFs = 0;
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0);
}
static int sriov_init(struct pci_dev *dev, int pos)