3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <redacted>

commit 694c6301e515bad574af74b6552134c4d9dcb334 upstream.

Fix regression introduced by commit 507ca9bc047666 ([PATCH] USB: add
ability for usb-serial drivers to determine if their write urb is
currently being used.) which inverted the logic in write_room so that it
returns zero when the write urb is actually free.

Signed-off-by: Johan Hovold <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/usb/serial/omninet.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/omninet.c
+++ b/drivers/usb/serial/omninet.c

@@ -315,7 +315,7 @@ static int omninet_write_room(struct tty
 	int room = 0; /* Default: no room */
 
 	/* FIXME: no consistent locking for write_urb_busy */
-	if (wport->write_urb_busy)
+	if (!wport->write_urb_busy)
 		room = wport->bulk_out_size - OMNINET_HEADERLEN;
 
 	dbg("%s - returns %d", __func__, room);