* Locking: ctrl_lock
*/
-int tty_check_change(struct tty_struct *tty)
+int __tty_check_change(struct tty_struct *tty, int sig)
{
unsigned long flags;
- struct pid *pgrp;
+ struct pid *pgrp, *tty_pgrp;
int ret = 0;
if (current->signal->tty != tty)
pgrp = task_pgrp(current);
spin_lock_irqsave(&tty->ctrl_lock, flags);
-
- if (!tty->pgrp) {
- printk(KERN_WARNING "tty_check_change: tty->pgrp == NULL!\n");
- goto out_unlock;
- }
- if (pgrp == tty->pgrp)
- goto out_unlock;
+ tty_pgrp = tty->pgrp;
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
- if (is_ignored(SIGTTOU))
- goto out_rcuunlock;
- if (is_current_pgrp_orphaned()) {
- ret = -EIO;
- goto out_rcuunlock;
+ if (tty_pgrp && pgrp != tty->pgrp) {
+ if (is_ignored(sig)) {
+ if (sig == SIGTTIN)
+ ret = -EIO;
+ } else if (is_current_pgrp_orphaned())
+ ret = -EIO;
+ else {
+ kill_pgrp(pgrp, sig, 1);
+ set_thread_flag(TIF_SIGPENDING);
+ ret = -ERESTARTSYS;
+ }
}
- kill_pgrp(pgrp, SIGTTOU, 1);
- rcu_read_unlock();
- set_thread_flag(TIF_SIGPENDING);
- ret = -ERESTARTSYS;
- return ret;
-out_unlock:
- spin_unlock_irqrestore(&tty->ctrl_lock, flags);
-out_rcuunlock:
rcu_read_unlock();
+
+ if (!tty_pgrp) {
+ pr_warn("%s: tty_check_change: sig=%d, tty->pgrp == NULL!\n",
+ tty_name(tty), sig);
+ }
+
return ret;
}
+int tty_check_change(struct tty_struct *tty)
+{
+ return __tty_check_change(tty, SIGTTOU);
+}
EXPORT_SYMBOL(tty_check_change);
static ssize_t hung_up_tty_read(struct file *file, char __user *buf,
if (tty) {
mutex_lock(&tty->atomic_write_lock);
tty_lock(tty);
- if (tty->ops->write && tty->count > 0) {
- tty_unlock(tty);
+ if (tty->ops->write && tty->count > 0)
tty->ops->write(tty, msg, strlen(msg));
- } else
- tty_unlock(tty);
+ tty_unlock(tty);
tty_write_unlock(tty);
}
return;
int was_stopped = tty->stopped;
if (tty->ops->send_xchar) {
+ down_read(&tty->termios_rwsem);
tty->ops->send_xchar(tty, ch);
+ up_read(&tty->termios_rwsem);
return 0;
}
if (tty_write_lock(tty, 0) < 0)
return -ERESTARTSYS;
+ down_read(&tty->termios_rwsem);
if (was_stopped)
start_tty(tty);
tty->ops->write(tty, &ch, 1);
if (was_stopped)
stop_tty(tty);
+ up_read(&tty->termios_rwsem);
tty_write_unlock(tty);
return 0;
}
tty->port->itty = NULL;
if (tty->link)
tty->link->port->itty = NULL;
- cancel_work_sync(&tty->port->buf.work);
+ tty_buffer_cancel_work(tty->port);
tty_kref_put(tty->link);
tty_kref_put(tty);
struct pid *pgrp;
pid_t pgrp_nr;
int retval = tty_check_change(real_tty);
- unsigned long flags;
if (retval == -EIO)
return -ENOTTY;
if (session_of_pgrp(pgrp) != task_session(current))
goto out_unlock;
retval = 0;
- spin_lock_irqsave(&tty->ctrl_lock, flags);
+ spin_lock_irq(&tty->ctrl_lock);
put_pid(real_tty->pgrp);
real_tty->pgrp = get_pid(pgrp);
- spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+ spin_unlock_irq(&tty->ctrl_lock);
out_unlock:
rcu_read_unlock();
return retval;