diff options
| author | Peter Hurley <[email protected]> | 2013-03-11 16:44:40 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2013-03-18 16:48:42 -0700 |
| commit | ebc9baed42e42f9b51cf61672b7afb72f068d523 (patch) | |
| tree | 2438eccbfddbfde6ff8a388f2dcf049913b4db8e /include/linux | |
| parent | 8842dda2366d3d0c97646102768831f9b0ffd712 (diff) | |
tty: Separate release semantics of ldisc reference
tty_ldisc_ref()/tty_ldisc_unref() have usage semantics
equivalent to down_read_trylock()/up_read(). Only
callers of tty_ldisc_put() are performing the additional
operations necessary for proper ldisc teardown, and then only
after ensuring no outstanding 'read lock' remains.
Thus, tty_ldisc_unref() should never be the last reference;
WARN if it is. Conversely, tty_ldisc_put() should never be
destructing if the use count != 1.
Signed-off-by: Peter Hurley <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions