diff options
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 366af832794..a9355ce1c6d 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -603,8 +603,8 @@ static int tty_signal_session_leader(struct tty_struct *tty, int exit_session) * BTM * redirect lock for undoing redirection * file list lock for manipulating list of ttys - * tty_ldisc_lock from called functions - * termios_mutex resetting termios data + * tty_ldiscs_lock from called functions + * termios_rwsem resetting termios data * tasklist_lock to walk task list for hangup event * ->siglock to protect ->signal/->sighand */ @@ -629,6 +629,11 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session) tty_lock(tty); + if (test_bit(TTY_HUPPED, &tty->flags)) { + tty_unlock(tty); + return; + } + /* some functions below drop BTM, so we need this bit */ set_bit(TTY_HUPPING, &tty->flags); @@ -664,7 +669,6 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session) spin_lock_irq(&tty->ctrl_lock); clear_bit(TTY_THROTTLED, &tty->flags); - clear_bit(TTY_PUSH, &tty->flags); clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); put_pid(tty->session); put_pid(tty->pgrp); @@ -1388,8 +1392,7 @@ static int tty_reopen(struct tty_struct *tty) struct tty_driver *driver = tty->driver; if (test_bit(TTY_CLOSING, &tty->flags) || - test_bit(TTY_HUPPING, &tty->flags) || - test_bit(TTY_LDISC_CHANGING, &tty->flags)) + test_bit(TTY_HUPPING, &tty->flags)) return -EIO; if (driver->type == TTY_DRIVER_TYPE_PTY && @@ -1405,7 +1408,7 @@ static int tty_reopen(struct tty_struct *tty) } tty->count++; - WARN_ON(!test_bit(TTY_LDISC, &tty->flags)); + WARN_ON(!tty->ldisc); return 0; } @@ -2202,7 +2205,7 @@ static int tty_fasync(int fd, struct file *filp, int on) * FIXME: does not honour flow control ?? * * Locking: - * Called functions take tty_ldisc_lock + * Called functions take tty_ldiscs_lock * current->signal->tty check is safe without locks * * FIXME: may race normal receive processing @@ -2231,7 +2234,7 @@ static int tiocsti(struct tty_struct *tty, char __user *p) * * Copies the kernel idea of the window size into the user buffer. * - * Locking: tty->termios_mutex is taken to ensure the winsize data + * Locking: tty->winsize_mutex is taken to ensure the winsize data * is consistent. */ @@ -2239,9 +2242,9 @@ static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg) { int err; - mutex_lock(&tty->termios_mutex); + mutex_lock(&tty->winsize_mutex); err = copy_to_user(arg, &tty->winsize, sizeof(*arg)); - mutex_unlock(&tty->termios_mutex); + mutex_unlock(&tty->winsize_mutex); return err ? -EFAULT: 0; } @@ -2262,7 +2265,7 @@ int tty_do_resize(struct tty_struct *tty, struct winsize *ws) unsigned long flags; /* Lock the tty */ - mutex_lock(&tty->termios_mutex); + mutex_lock(&tty->winsize_mutex); if (!memcmp(ws, &tty->winsize, sizeof(*ws))) goto done; /* Get the PID values and reference them so we can @@ -2277,7 +2280,7 @@ int tty_do_resize(struct tty_struct *tty, struct winsize *ws) tty->winsize = *ws; done: - mutex_unlock(&tty->termios_mutex); + mutex_unlock(&tty->winsize_mutex); return 0; } EXPORT_SYMBOL(tty_do_resize); @@ -3016,8 +3019,10 @@ void initialize_tty_struct(struct tty_struct *tty, tty->session = NULL; tty->pgrp = NULL; mutex_init(&tty->legacy_mutex); - mutex_init(&tty->termios_mutex); - mutex_init(&tty->ldisc_mutex); + mutex_init(&tty->throttle_mutex); + init_rwsem(&tty->termios_rwsem); + mutex_init(&tty->winsize_mutex); + init_ldsem(&tty->ldisc_sem); init_waitqueue_head(&tty->write_wait); init_waitqueue_head(&tty->read_wait); INIT_WORK(&tty->hangup_work, do_tty_hangup); |