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-rw-r--r--drivers/tty/tty_ldisc.c41
1 files changed, 25 insertions, 16 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 173a900..ba8be39 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -894,6 +894,23 @@ int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
tty_ldisc_enable(tty);
return 0;
}
+
+static void tty_ldisc_kill(struct tty_struct *tty)
+{
+ mutex_lock(&tty->ldisc_mutex);
+ /*
+ * Now kill off the ldisc
+ */
+ tty_ldisc_close(tty, tty->ldisc);
+ tty_ldisc_put(tty->ldisc);
+ /* Force an oops if we mess this up */
+ tty->ldisc = NULL;
+
+ /* Ensure the next open requests the N_TTY ldisc */
+ tty_set_termios_ldisc(tty, N_TTY);
+ mutex_unlock(&tty->ldisc_mutex);
+}
+
/**
* tty_ldisc_release - release line discipline
* @tty: tty being shut down
@@ -912,27 +929,19 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
* race with the set_ldisc code path.
*/
- tty_unlock(tty);
+ tty_unlock_pair(tty, o_tty);
tty_ldisc_halt(tty);
tty_ldisc_flush_works(tty);
- tty_lock(tty);
-
- mutex_lock(&tty->ldisc_mutex);
- /*
- * Now kill off the ldisc
- */
- tty_ldisc_close(tty, tty->ldisc);
- tty_ldisc_put(tty->ldisc);
- /* Force an oops if we mess this up */
- tty->ldisc = NULL;
+ if (o_tty) {
+ tty_ldisc_halt(o_tty);
+ tty_ldisc_flush_works(o_tty);
+ }
+ tty_lock_pair(tty, o_tty);
- /* Ensure the next open requests the N_TTY ldisc */
- tty_set_termios_ldisc(tty, N_TTY);
- mutex_unlock(&tty->ldisc_mutex);
- /* This will need doing differently if we need to lock */
+ tty_ldisc_kill(tty);
if (o_tty)
- tty_ldisc_release(o_tty, NULL);
+ tty_ldisc_kill(o_tty);
/* And the memory resources remaining (buffers, termios) will be
disposed of when the kref hits zero */
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