[PATCH 1/2] tty: Abstract tty buffer work

[Peter Hurley]

Introduce API functions to restart and cancel tty buffer work, rather
than manipulate buffer work directly.

Signed-off-by: Peter Hurley <pe...@hurleysoftware.com>
---
 drivers/tty/n_tty.c      |  2 +-
 drivers/tty/tty_buffer.c | 10 ++++++++++
 drivers/tty/tty_io.c     |  2 +-
 drivers/tty/tty_port.c   |  2 +-
 include/linux/tty.h      |  2 ++
 5 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index fb8ccbf..1384426 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -201,7 +201,7 @@ static void n_tty_kick_worker(struct tty_struct *tty)
                 */
                WARN_RATELIMIT(test_bit(TTY_LDISC_HALTED, &tty->flags),
                               "scheduling buffer work for halted ldisc\n");
-               queue_work(system_unbound_wq, &tty->port->buf.work);
+               tty_buffer_restart_work(tty->port);
        }
 }
 
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index a660ab1..7cc16db 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -587,3 +587,13 @@ void tty_buffer_set_lock_subclass(struct tty_port *port)
 {
        lockdep_set_subclass(&port->buf.lock, TTY_LOCK_SLAVE);
 }
+
+bool tty_buffer_restart_work(struct tty_port *port)
+{
+       return queue_work(system_unbound_wq, &port->buf.work);
+}
+
+bool tty_buffer_cancel_work(struct tty_port *port)
+{
+       return cancel_work_sync(&port->buf.work);
+}
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 173fdeb..0c41dbc 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1689,7 +1689,7 @@ static void release_tty(struct tty_struct *tty, int idx)
        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);
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index e04a8cf..482f33f 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -130,7 +130,7 @@ EXPORT_SYMBOL(tty_port_free_xmit_buf);
  */
 void tty_port_destroy(struct tty_port *port)
 {
-       cancel_work_sync(&port->buf.work);
+       tty_buffer_cancel_work(port);
        tty_buffer_free_all(port);
 }
 EXPORT_SYMBOL(tty_port_destroy);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 533d7f6..5b04b0a 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -467,6 +467,8 @@ extern void tty_buffer_free_all(struct tty_port *port);
 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
 extern void tty_buffer_init(struct tty_port *port);
 extern void tty_buffer_set_lock_subclass(struct tty_port *port);
+extern bool tty_buffer_restart_work(struct tty_port *port);
+extern bool tty_buffer_cancel_work(struct tty_port *port);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
-- 
2.6.1

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