Do not allow the interrupt handler or another CPU to change the value between when we get the initial value and when we write the modified value. Also includes a minor formatting fix where braces were not aligned, and remove 'inline' from t4_framer_in and t4_framer_out definitions. Signed-off-by: Shaun Ruffell <sruffell@digium.com> Acked-by: Russ Meyerriecks <rmeyerriecks@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9931 a0bf4364-ded3-4de4-8d8a-66a801d63aff