tty_port: If we are opened non blocking we still need to raise the carrier
Original discussion: http://thread.gmane.org/gmane.linux.usb.general/23217/focus=23248 or http://marc.info/?l=linux-usb&m=125553790714133&w=2 The tty_port code inherited a bug common to various drivers it was based upon. If the tty is opened O_NONBLOCK we do not wait for the carrier to be raised but we must still raise our modem lines if appropriate. (There is a second question here about whether we should do so if CLOCAL is set but that can wait) Signed-off-by: NAlan Cox <alan@linux.intel.com> Reported-by: NKarl Hiramoto <karl@hiramoto.org> Tested-by: NKarl Hiramoto <karl@hiramoto.org> Cc: stable <stable@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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