epoll keyed wakeups: make tty use keyed wakeups

Introduce keyed event wakeups inside the TTY code.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Cc: William Lee Irwin III <wli@movementarian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 224f271d8cbe06868d69ce415339efa30f110d55..33dac94922a79c1a86b98ea6bc1037d6ef506222 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -464,7 +464,7 @@ void tty_wakeup(struct tty_struct *tty)
                        tty_ldisc_deref(ld);
                }
        }
-       wake_up_interruptible(&tty->write_wait);
+       wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
 }
 
 EXPORT_SYMBOL_GPL(tty_wakeup);
@@ -587,8 +587,8 @@ static void do_tty_hangup(struct work_struct *work)
         * FIXME: Once we trust the LDISC code better we can wait here for
         * ldisc completion and fix the driver call race
         */
-       wake_up_interruptible(&tty->write_wait);
-       wake_up_interruptible(&tty->read_wait);
+       wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+       wake_up_interruptible_poll(&tty->read_wait, POLLIN);
        /*
         * Shutdown the current line discipline, and reset it to
         * N_TTY.
@@ -879,7 +879,7 @@ void stop_tty(struct tty_struct *tty)
        if (tty->link && tty->link->packet) {
                tty->ctrl_status &= ~TIOCPKT_START;
                tty->ctrl_status |= TIOCPKT_STOP;
-               wake_up_interruptible(&tty->link->read_wait);
+               wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
        }
        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
        if (tty->ops->stop)
@@ -913,7 +913,7 @@ void start_tty(struct tty_struct *tty)
        if (tty->link && tty->link->packet) {
                tty->ctrl_status &= ~TIOCPKT_STOP;
                tty->ctrl_status |= TIOCPKT_START;
-               wake_up_interruptible(&tty->link->read_wait);
+               wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
        }
        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
        if (tty->ops->start)
@@ -970,7 +970,7 @@ static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
 void tty_write_unlock(struct tty_struct *tty)
 {
        mutex_unlock(&tty->atomic_write_lock);
-       wake_up_interruptible(&tty->write_wait);
+       wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
 }
 
 int tty_write_lock(struct tty_struct *tty, int ndelay)
@@ -1623,21 +1623,21 @@ void tty_release_dev(struct file *filp)
 
                if (tty_closing) {
                        if (waitqueue_active(&tty->read_wait)) {
-                               wake_up(&tty->read_wait);
+                               wake_up_poll(&tty->read_wait, POLLIN);
                                do_sleep++;
                        }
                        if (waitqueue_active(&tty->write_wait)) {
-                               wake_up(&tty->write_wait);
+                               wake_up_poll(&tty->write_wait, POLLOUT);
                                do_sleep++;
                        }
                }
                if (o_tty_closing) {
                        if (waitqueue_active(&o_tty->read_wait)) {
-                               wake_up(&o_tty->read_wait);
+                               wake_up_poll(&o_tty->read_wait, POLLIN);
                                do_sleep++;
                        }
                        if (waitqueue_active(&o_tty->write_wait)) {
-                               wake_up(&o_tty->write_wait);
+                               wake_up_poll(&o_tty->write_wait, POLLOUT);
                                do_sleep++;
                        }
                }