usb: Use hub port data to determine whether a port is removable
Hubs have a flag to indicate whether a given port carries removable devices
or not. This is not strictly accurate in that some built-in devices
will be flagged as removable, but followup patches will make use of platform
data to make this more reliable.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index a0613d8..2d773cb 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1838,6 +1838,37 @@
return err;
}
+static void set_usb_port_removable(struct usb_device *udev)
+{
+ struct usb_device *hdev = udev->parent;
+ struct usb_hub *hub;
+ u8 port = udev->portnum;
+ u16 wHubCharacteristics;
+ bool removable = true;
+
+ if (!hdev)
+ return;
+
+ hub = hdev_to_hub(udev->parent);
+
+ wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
+
+ if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
+ return;
+
+ if (hub_is_superspeed(hdev)) {
+ if (hub->descriptor->u.ss.DeviceRemovable & (1 << port))
+ removable = false;
+ } else {
+ if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
+ removable = false;
+ }
+
+ if (removable)
+ udev->removable = USB_DEVICE_REMOVABLE;
+ else
+ udev->removable = USB_DEVICE_FIXED;
+}
/**
* usb_new_device - perform initial device setup (usbcore-internal)
@@ -1896,6 +1927,15 @@
announce_device(udev);
device_enable_async_suspend(&udev->dev);
+
+ /*
+ * check whether the hub marks this port as non-removable. Do it
+ * now so that platform-specific data can override it in
+ * device_add()
+ */
+ if (udev->parent)
+ set_usb_port_removable(udev);
+
/* Register the device. The device driver is responsible
* for configuring the device and invoking the add-device
* notifier chain (used by usbfs and possibly others).