wusb: return -ENOTCONN when resetting a port with no connected device

If reading the device descriptor fails during hub_port_init() fails,
then the port is disabled, disconnecting the device.  The port is then
reset at the start of the next init attempt but there is no device to
reset.

Signed-off-by: David Vrabel <david.vrabel@csr.com>

diff --git a/drivers/usb/wusbcore/devconnect.c b/drivers/usb/wusbcore/devconnect.c
index e2e7e4b..8e18141 100644 (file)
--- a/drivers/usb/wusbcore/devconnect.c
+++ b/drivers/usb/wusbcore/devconnect.c
@@ -386,6 +386,7 @@ static void __wusbhc_dev_disconnect(struct wusbhc *wusbhc,
                          | USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED);
        port->change |= USB_PORT_STAT_C_CONNECTION | USB_PORT_STAT_C_ENABLE;
        if (wusb_dev) {
+               dev_dbg(wusbhc->dev, "disconnecting device from port %d\n", wusb_dev->port_idx);
                if (!list_empty(&wusb_dev->cack_node))
                        list_del_init(&wusb_dev->cack_node);
                /* For the one in cack_add() */

diff --git a/drivers/usb/wusbcore/rh.c b/drivers/usb/wusbcore/rh.c
index 95c6fa3..407a9fc 100644 (file)
--- a/drivers/usb/wusbcore/rh.c
+++ b/drivers/usb/wusbcore/rh.c
@@ -100,6 +100,9 @@ static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
        struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
        struct wusb_dev *wusb_dev = port->wusb_dev;
 
+       if (wusb_dev == NULL)
+               return -ENOTCONN;
+
        port->status |= USB_PORT_STAT_RESET;
        port->change |= USB_PORT_STAT_C_RESET;