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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/wusbcore/rh.c b/drivers/usb/wusbcore/rh.c
index 95c6fa3bf6b..407a9fcc89c 100644
--- 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;