Function cleanup_partial_bind

crates/openshell-vfio/src/bind.rs:125–138

Best-effort rollback of partial bind state. Clears `driver_override` and re-probes so the kernel re-attaches the host driver. Used on failure paths in [`bind_device_to_vfio`] after `driver_override` has been pinned to `vfio-pci` but the bind did not complete; without this the device is left with `driver_override=vfio-pci` and would silently re-bind to vfio-pci on the next probe event.

(sysfs: &SysfsRoot, bdf: &str)

/// with `driver_override=vfio-pci` and would silently re-bind to vfio-pci on
/// the next probe event.
fn cleanup_partial_bind(sysfs: &SysfsRoot, bdf: &str) {
    let device = sysfs.pci_device_ref(bdf);
    if device.driver_override_path().exists()
        && let Err(err) = device.clear_driver_override()
    {
        tracing::warn!(bdf, %err, "failed to clear driver_override during bind rollback");
    }
    let probe = sysfs.drivers_probe();
    if probe.exists()
        && let Err(err) = write_sysfs(&probe, bdf)
    {
        tracing::warn!(bdf, %err, "failed to re-probe during bind rollback");
    }
}

/// Bind a single PCI device to `vfio-pci`. Skips devices already bound.
pub(crate) fn bind_device_to_vfio(sysfs: &SysfsRoot, bdf: &str) -> Result<bool, VfioError> {