Yu Zhao <yu.zhao@xxxxxxxxx> writes:
> +
> +
> +static int sriov_init(struct pci_dev *dev, int pos)
> +{
> + int i;
> + int rc;
> + int nres;
> + u32 pgsz;
> + u16 ctrl, total, offset, stride;
> + struct pci_sriov *iov;
> + struct resource *res;
> + struct pci_dev *pdev;
> +
> + if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
> + dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
> + return -ENODEV;
> +
It would be a good idea to put a might_sleep() here just in
case the msleep happens below and drivers call it incorrectly.
> + pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
> + if (ctrl & PCI_SRIOV_CTRL_VFE) {
> + pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
> + msleep(100);
That's really long. Hopefully that's really needed.
> +
> + pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
> + pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
> + pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
> + pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
> + if (!offset || (total > 1 && !stride))
> + return -EIO;
> +
> + pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
> + i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
> + pgsz &= ~((1 << i) - 1);
> + if (!pgsz)
> + return -EIO;
All the error paths don't seem to undo the config space writes.
How will the devices behave with half initialized context?
-Andi
--
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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