Make port_chain return Vec not Option<Vec>

src/enumeration.rs

@@ -51,7 +51,7 @@ pub struct DeviceInfo {
 
     pub(crate) bus_id: String,
     pub(crate) device_address: u8,
-    pub(crate) port_chain: Option<Vec<u8>>,
+    pub(crate) port_chain: Vec<u8>,
 
     pub(crate) vendor_id: u16,
     pub(crate) product_id: u16,
@@ -141,8 +141,8 @@ impl DeviceInfo {
     ///
     /// Since USB SuperSpeed is a separate topology from USB 2.0 speeds, a
     /// physical port may be identified differently depending on speed.
-    pub fn port_chain(&self) -> Option<&[u8]> {
-        self.port_chain.as_deref()
+    pub fn port_chain(&self) -> &[u8] {
+        &self.port_chain
     }
 
     /// *(Windows-only)* Driver associated with the device as a whole

src/platform/linux_usbfs/enumeration.rs

@@ -132,7 +132,8 @@ pub fn probe_device(path: SysfsPath) -> Result<DeviceInfo, SysfsError> {
         p.split('.')
             .map(|v| v.parse::<u8>().ok())
             .collect::<Option<Vec<u8>>>()
-    });
+    }).unwrap_or_default();
+
     Ok(DeviceInfo {
         busnum,
         bus_id: format!("{busnum:03}"),

src/platform/macos_iokit/enumeration.rs

@@ -57,7 +57,7 @@ pub(crate) fn probe_device(device: IoService) -> Option<DeviceInfo> {
         location_id,
         bus_id: format!("{:02x}", (location_id >> 24) as u8),
         device_address: get_integer_property(&device, "USB Address")? as u8,
-        port_chain: Some(parse_location_id(location_id)),
+        port_chain: parse_location_id(location_id),
         vendor_id: get_integer_property(&device, "idVendor")? as u16,
         product_id: get_integer_property(&device, "idProduct")? as u16,
         device_version: get_integer_property(&device, "bcdDevice")? as u16,

src/platform/windows_winusb/enumeration.rs

@@ -109,7 +109,7 @@ pub fn probe_device(devinst: DevInst) -> Option<DeviceInfo> {
         parent_instance_id,
         devinst,
         port_number,
-        port_chain: Some(port_chain),
+        port_chain,
         driver: Some(driver).filter(|s| !s.is_empty()),
         bus_id,
         device_address: info.address,