vxge: fix crash of VF when unloading PF
Calling pci_disable_sriov when unloading a SR-IOV physical function driver from a host when a guest is using a virtual function from that device can cause a host crash or VM crash. The crash is caused by the virtual config space no longer being present when PF is removed (due to the pci_disable_sriov). This can be avoided by not calling pci_disable_sriov to disable the PCI space when shutting down the PF. Each function in the X3100 operates independently and in this case will operate properly in the absence of the PF. Also, added improved logic in the detection of SR-IOV initialization. Signed-off-by: Jon Mason <jon.mason@exar.com> Signed-off-by: Ram Vepa <ram.vepa@exar.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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528f727279
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1 changed files with 18 additions and 7 deletions
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@ -4182,6 +4182,20 @@ static int vxge_probe_fw_update(struct vxgedev *vdev)
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return ret;
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}
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static int __devinit is_sriov_initialized(struct pci_dev *pdev)
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{
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int pos;
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u16 ctrl;
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pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
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if (pos) {
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pci_read_config_word(pdev, pos + PCI_SRIOV_CTRL, &ctrl);
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if (ctrl & PCI_SRIOV_CTRL_VFE)
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return 1;
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}
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return 0;
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}
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/**
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* vxge_probe
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* @pdev : structure containing the PCI related information of the device.
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@ -4370,14 +4384,13 @@ vxge_probe(struct pci_dev *pdev, const struct pci_device_id *pre)
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num_vfs = vxge_get_num_vfs(function_mode) - 1;
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/* Enable SRIOV mode, if firmware has SRIOV support and if it is a PF */
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if (is_sriov(function_mode) && (max_config_dev > 1) &&
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(ll_config->intr_type != INTA) &&
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(is_privileged == VXGE_HW_OK)) {
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ret = pci_enable_sriov(pdev, ((max_config_dev - 1) < num_vfs)
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? (max_config_dev - 1) : num_vfs);
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if (is_sriov(function_mode) && !is_sriov_initialized(pdev) &&
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(ll_config->intr_type != INTA)) {
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ret = pci_enable_sriov(pdev, num_vfs);
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if (ret)
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vxge_debug_ll_config(VXGE_ERR,
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"Failed in enabling SRIOV mode: %d\n", ret);
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/* No need to fail out, as an error here is non-fatal */
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}
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/*
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@ -4673,8 +4686,6 @@ static void __devexit vxge_remove(struct pci_dev *pdev)
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iounmap(vdev->bar0);
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pci_disable_sriov(pdev);
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/* we are safe to free it now */
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free_netdev(dev);
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