tty: Simplify tty_ldisc_release() interface
Passing the 'other' tty to tty_ldisc_release() only makes sense
for a pty pair; make o_tty function local instead.
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index f5b62b9..cd95508 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1892,7 +1892,7 @@
/*
* Ask the line discipline code to release its structures
*/
- tty_ldisc_release(tty, o_tty);
+ tty_ldisc_release(tty);
/* Wait for pending work before tty destruction commmences */
tty_flush_works(tty);
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 49001fa..1c4d7b6 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -756,18 +756,17 @@
/**
* tty_ldisc_release - release line discipline
- * @tty: tty being shut down
- * @o_tty: pair tty for pty/tty pairs
+ * @tty: tty being shut down (or one end of pty pair)
*
- * Called during the final close of a tty/pty pair in order to shut down
- * the line discpline layer. On exit the ldisc assigned is N_TTY and the
- * ldisc has not been opened.
- *
- * Holding ldisc_sem write lock serializes tty->ldisc changes.
+ * Called during the final close of a tty or a pty pair in order to shut
+ * down the line discpline layer. On exit, each ldisc assigned is N_TTY and
+ * each ldisc has not been opened.
*/
-void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
+void tty_ldisc_release(struct tty_struct *tty)
{
+ struct tty_struct *o_tty = tty->link;
+
/*
* Shutdown this line discipline. As this is the final close,
* it does not race with the set_ldisc code path.