TTY: simserial, use tty_port_hangup

Convert shutdown to be tty_port_operations->shutdown. Then we can use
tty_port_hangup. (And we have to use tty_port_close.)

This means we no longer touch ASYNC_INITIALIZED, TTY_IO_ERROR. Also we
do not need to do any peculiar TTY logic in the file now.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 57 deletions

diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index e9c5fb7b923d..323c9325e570 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -388,17 +388,11 @@ static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
  * This routine will shutdown a serial port; interrupts are disabled, and
  * DTR is dropped if the hangup on close termio flag is on.
  */
-static void shutdown(struct tty_struct *tty, struct serial_state *info)
+static void shutdown(struct tty_port *port)
 {
-        unsigned long   flags;
-
-        if (!(info->port.flags & ASYNC_INITIALIZED))
-                return;
-
-#ifdef SIMSERIAL_DEBUG
-        printk("Shutting down serial port %d (irq %d)...\n", info->line,
-               info->irq);
-#endif
+        struct serial_state *info = container_of(port, struct serial_state,
+                        port);
+        unsigned long flags;
 
         local_irq_save(flags);
         {
@@ -409,70 +403,25 @@ static void shutdown(struct tty_struct *tty, struct serial_state *info)
                         free_page((unsigned long) info->xmit.buf);
                         info->xmit.buf = NULL;
                 }
-
-                set_bit(TTY_IO_ERROR, &tty->flags);
-
-                info->port.flags &= ~ASYNC_INITIALIZED;
         }
         local_irq_restore(flags);
 }
 
-/*
- * ------------------------------------------------------------
- * rs_close()
- *
- * This routine is called when the serial port gets closed.  First, we
- * wait for the last remaining data to be sent.  Then, we unlink its
- * async structure from the interrupt chain if necessary, and we free
- * that IRQ if nothing is left in the chain.
- * ------------------------------------------------------------
- */
 static void rs_close(struct tty_struct *tty, struct file * filp)
 {
         struct serial_state *info = tty->driver_data;
-        struct tty_port *port = &info->port;
-
-        if (!info)
-                return;
-
-        if (tty_port_close_start(port, tty, filp) == 0)
-                return;
-
-        /*
-         * Now we wait for the transmit buffer to clear; and we notify
-         * the line discipline to only process XON/XOFF characters.
-         */
-        shutdown(tty, info);
-        rs_flush_buffer(tty);
 
-        tty_port_close_end(port, tty);
-        tty_port_tty_set(port, NULL);
+        tty_port_close(&info->port, tty, filp);
 }
 
-/*
- * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
 static void rs_hangup(struct tty_struct *tty)
 {
         struct serial_state *info = tty->driver_data;
-        struct tty_port *port = &info->port;
-
-#ifdef SIMSERIAL_DEBUG
-        printk("rs_hangup: called\n");
-#endif
 
         rs_flush_buffer(tty);
-        if (port->flags & ASYNC_CLOSING)
-                return;
-        shutdown(tty, info);
-
-        port->count = 0;
-        port->flags &= ~ASYNC_NORMAL_ACTIVE;
-        tty_port_tty_set(port, NULL);
-        wake_up_interruptible(&port->open_wait);
+        tty_port_hangup(&info->port);
 }
 
-
 static int activate(struct tty_port *port, struct tty_struct *tty)
 {
         struct serial_state *state = container_of(port, struct serial_state,
@@ -615,6 +564,7 @@ static const struct tty_operations hp_ops = {
 
 static const struct tty_port_operations hp_port_ops = {
         .activate = activate,
+        .shutdown = shutdown,
 };
 
 /*