On Fri, Oct 16, 2015 at 04:16:28PM -0500, Bjorn Helgaas wrote:
> Previously, we read PCI_SRIOV_VF_OFFSET and PCI_SRIOV_VF_STRIDE from the
> SR-IOV capability in pci_iov_set_numvfs() after changing PCI_SRIOV_NUM_VF,
> and we read them again in sriov_enable(). But sriov_init() always calls
> pci_iov_set_numvfs() before a successful return, and it caches the offset
> and stride values, so there's no need to read the capability again in
> sriov_enable().
>
> Remove the PCI_SRIOV_VF_OFFSET and PCI_SRIOV_VF_STRIDE config reads from
> sriov_enable() and use the cached values from the pci_sriov structure.
>
> Signed-off-by: Bjorn Helgaas <[email protected]>
I haven't seen any objections, so I applied this to pci/virtualization for
v4.4.
> ---
> drivers/pci/iov.c | 9 ++-------
> 1 file changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index 0202ab0..9b52ad4 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -230,7 +230,7 @@ static int sriov_enable(struct pci_dev *dev, int
> nr_virtfn)
> int rc;
> int i, j;
> int nres;
> - u16 offset, stride, initial;
> + u16 initial;
> struct resource *res;
> struct pci_dev *pdev;
> struct pci_sriov *iov = dev->sriov;
> @@ -253,9 +253,7 @@ static int sriov_enable(struct pci_dev *dev, int
> nr_virtfn)
> (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
> return -EINVAL;
>
> - 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))
> + if (!iov->offset || (nr_virtfn > 1 && !iov->stride))
> return -EIO;
>
> nres = 0;
> @@ -270,9 +268,6 @@ static int sriov_enable(struct pci_dev *dev, int
> nr_virtfn)
> return -ENOMEM;
> }
>
> - iov->offset = offset;
> - iov->stride = stride;
> -
> bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
> if (bus > dev->bus->busn_res.end) {
> dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range
> of %pR)\n",
>
> --
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