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| author | Peter Hurley <peter@hurleysoftware.com> | 2013-03-11 16:44:21 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-18 16:32:46 -0700 |
| commit | 21622939fc452c7fb739464b8e49368c3ceaa0ee (patch) | |
| tree | c96d6a137611e9d976a4d391a48c94f5267db7ff /drivers/tty/tty_ldisc.c | |
| parent | 91debb0383d6564e0dc8ae76181f6daf8e24717a (diff) | |
| download | linux-21622939fc452c7fb739464b8e49368c3ceaa0ee.tar.gz linux-21622939fc452c7fb739464b8e49368c3ceaa0ee.tar.bz2 linux-21622939fc452c7fb739464b8e49368c3ceaa0ee.zip | |
tty: Add diagnostic for halted line discipline
Flip buffer work must not be scheduled by the line discipline
after the line discipline has been halted; issue warning.
Note: drivers can still schedule flip buffer work.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_ldisc.c')
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index d794087c327e..c641321b9404 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -375,6 +375,7 @@ static inline void tty_ldisc_put(struct tty_ldisc *ld) void tty_ldisc_enable(struct tty_struct *tty) { + clear_bit(TTY_LDISC_HALTED, &tty->flags); set_bit(TTY_LDISC, &tty->flags); clear_bit(TTY_LDISC_CHANGING, &tty->flags); wake_up(&tty_ldisc_wait); @@ -513,8 +514,11 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old) static int tty_ldisc_halt(struct tty_struct *tty) { + int scheduled; clear_bit(TTY_LDISC, &tty->flags); - return cancel_work_sync(&tty->port->buf.work); + scheduled = cancel_work_sync(&tty->port->buf.work); + set_bit(TTY_LDISC_HALTED, &tty->flags); + return scheduled; } /** @@ -820,6 +824,7 @@ void tty_ldisc_hangup(struct tty_struct *tty) clear_bit(TTY_LDISC, &tty->flags); tty_unlock(tty); cancel_work_sync(&tty->port->buf.work); + set_bit(TTY_LDISC_HALTED, &tty->flags); mutex_unlock(&tty->ldisc_mutex); retry: tty_lock(tty); |