tree 1612dd60ae378dfb1369001c2eed60265797f1c0
parent bc5a5e3f45d047844830233fb95b19a95c864a0f
author Peter Hurley <peter@hurleysoftware.com> 1371302062 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1374622980 -0700

n_tty: Remove read_cnt

Storing the read_cnt creates an unnecessary shared variable
between the single-producer (n_tty_receive_buf()) and the
single-consumer (n_tty_read()).

Compute read_cnt from head & tail instead of storing.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>