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Commit 92bfbf71 authored by Matthew Garrett's avatar Matthew Garrett Committed by Greg Kroah-Hartman
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usb: Prefer firmware values when determining whether a port is removable 



Windows appears to pay more attention to the ACPI values than any hub
configuration, so prefer the firmware's opinion on whether a port is
fixed or removable before falling back to the hub values.

Signed-off-by: default avatarMatthew Garrett <mjg59@coreos.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5ebe6afa

drivers/usb/core/hub.c

+17 −15
Original line number Diff line number Diff line
@@ -2350,6 +2350,23 @@ static void set_usb_port_removable(struct usb_device *udev) 


	hub = usb_hub_to_struct_hub(udev->parent);



	/*

	 * If the platform firmware has provided information about a port,

	 * use that to determine whether it's removable.

	 */

	switch (hub->ports[udev->portnum - 1]->connect_type) {

	case USB_PORT_CONNECT_TYPE_HOT_PLUG:

		udev->removable = USB_DEVICE_REMOVABLE;

		return;

	case USB_PORT_CONNECT_TYPE_HARD_WIRED:

		udev->removable = USB_DEVICE_FIXED;

		return;

	}



	/*

	 * Otherwise, check whether the hub knows whether a port is removable

	 * or not

	 */

	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);



	if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
@@ -2369,21 +2386,6 @@ static void set_usb_port_removable(struct usb_device *udev) 
	else

		udev->removable = USB_DEVICE_FIXED;



	/*

	 * Platform firmware may have populated an alternative value for

	 * removable.  If the parent port has a known connect_type use

	 * that instead.

	 */

	switch (hub->ports[udev->portnum - 1]->connect_type) {

	case USB_PORT_CONNECT_TYPE_HOT_PLUG:

		udev->removable = USB_DEVICE_REMOVABLE;

		break;

	case USB_PORT_CONNECT_TYPE_HARD_WIRED:

		udev->removable = USB_DEVICE_FIXED;

		break;

	default: /* use what was set above */

		break;

	}

}



/**