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vfio/pci: Bypass IGD init in case of -ENODEV

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[ Upstream commit e4eccb853664de7bcf9518fb658f35e748bf1f68 ]

Bypass the IGD initialization when -ENODEV returns,
that should be the case if opregion is not available for IGD
or within discrete graphics device's option ROM,
or host/lpc bridge is not found.

Then use of -ENODEV here means no special device resources found
which needs special care for VFIO, but we still allow other normal
device resource access.

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Xiong Zhang <xiong.y.zhang@intel.com>
Cc: Hang Yuan <hang.yuan@linux.intel.com>
Cc: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Fred Gao <fred.gao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fred Gao 2020-11-03 02:01:20 +08:00 • committed by Greg Kroah-Hartman
commit b66c7cdedd
1 changed files with 1 additions and 1 deletions
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2
drivers/vfio/pci/vfio_pci.c
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@ -334,7 +334,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
pdev->vendor == PCI_VENDOR_ID_INTEL &&
IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
ret = vfio_pci_igd_init(vdev);
if (ret) {
if (ret && ret != -ENODEV) {
pci_warn(pdev, "Failed to setup Intel IGD regions\n");
goto disable_exit;
}