serial: move delta_msr_wait into the tty_port

This is used by various drivers not just serial and can be extracted
as commonality

Signed-off-by: Alan Cox <alan@linux.intel.com>

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 9d42e57e197..e16d15343df 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -215,7 +215,8 @@ static int uart_startup(struct uart_state *state, int init_hw)
 static void uart_shutdown(struct uart_state *state)
 {
         struct uart_port *uport = state->uart_port;
-        struct tty_struct *tty = state->port.tty;
+        struct tty_port *port = &state->port;
+        struct tty_struct *tty = port->tty;
 
         /*
          * Set the TTY IO error marker
@@ -223,7 +224,7 @@ static void uart_shutdown(struct uart_state *state)
         if (tty)
                 set_bit(TTY_IO_ERROR, &tty->flags);
 
-        if (test_and_clear_bit(ASYNCB_INITIALIZED, &state->port.flags)) {
+        if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {
                 /*
                  * Turn off DTR and RTS early.
                  */
@@ -237,7 +238,7 @@ static void uart_shutdown(struct uart_state *state)
                  * any outstanding file descriptors should be pointing at
                  * hung_up_tty_fops now.
                  */
-                wake_up_interruptible(&state->delta_msr_wait);
+                wake_up_interruptible(&port->delta_msr_wait);
 
                 /*
                  * Free the IRQ and disable the port.
@@ -1004,11 +1005,15 @@ static int uart_do_autoconfig(struct uart_state *state)
  * - mask passed in arg for lines of interest
  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
  * Caller should use TIOCGICOUNT to see which one it was
+ *
+ * FIXME: This wants extracting into a common all driver implementation
+ * of TIOCMWAIT using tty_port.
  */
 static int
 uart_wait_modem_status(struct uart_state *state, unsigned long arg)
 {
         struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
         DECLARE_WAITQUEUE(wait, current);
         struct uart_icount cprev, cnow;
         int ret;
@@ -1025,7 +1030,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
         uport->ops->enable_ms(uport);
         spin_unlock_irq(&uport->lock);
 
-        add_wait_queue(&state->delta_msr_wait, &wait);
+        add_wait_queue(&port->delta_msr_wait, &wait);
         for (;;) {
                 spin_lock_irq(&uport->lock);
                 memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
@@ -1053,7 +1058,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
         }
 
         current->state = TASK_RUNNING;
-        remove_wait_queue(&state->delta_msr_wait, &wait);
+        remove_wait_queue(&port->delta_msr_wait, &wait);
 
         return ret;
 }
@@ -1430,7 +1435,7 @@ static void uart_hangup(struct tty_struct *tty)
                 clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
                 port->tty = NULL;
                 wake_up_interruptible(&port->open_wait);
-                wake_up_interruptible(&state->delta_msr_wait);
+                wake_up_interruptible(&port->delta_msr_wait);
         }
         mutex_unlock(&port->mutex);
 }
@@ -2378,7 +2383,6 @@ int uart_register_driver(struct uart_driver *drv)
                 tty_port_init(port);
                 port->close_delay     = 500;    /* .5 seconds */
                 port->closing_wait    = 30000;  /* 30 seconds */
-                init_waitqueue_head(&state->delta_msr_wait);
                 tasklet_init(&state->tlet, uart_tasklet_action,
                              (unsigned long)state);
         }