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Don't allow entry to iwctl_siwencodeext if device not open. This fixes a race condition where wpa supplicant/network manager enters the function when the device is already closed. Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com> Cc: stable@vger.kernel.org # 3.8+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>