isicom: Split the close hardware bits out

Start to extract and build a model for a common tty_port_close()

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

1 files changed, 14 insertions, 11 deletions

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 4f1f4cd670da..08f574333a57 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -952,19 +952,12 @@ static void isicom_flush_buffer(struct tty_struct *tty)
         tty_wakeup(tty);
 }
 
-static void isicom_close(struct tty_struct *tty, struct file *filp)
+static void isicom_close_port(struct tty_port *port)
 {
-        struct isi_port *ip = tty->driver_data;
-        struct tty_port *port = &ip->port;
-        struct isi_board *card;
+        struct isi_port *ip = container_of(port, struct isi_port, port);
+        struct isi_board *card = ip->card;
         unsigned long flags;
 
-        BUG_ON(!ip);
-
-        card = ip->card;
-        if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
-                return;
-
         /* indicate to the card that no more data can be received
            on this port */
         spin_lock_irqsave(&card->card_lock, flags);
@@ -974,9 +967,19 @@ static void isicom_close(struct tty_struct *tty, struct file *filp)
         }
         isicom_shutdown_port(ip);
         spin_unlock_irqrestore(&card->card_lock, flags);
+}
 
+static void isicom_close(struct tty_struct *tty, struct file *filp)
+{
+        struct isi_port *ip = tty->driver_data;
+        struct tty_port *port = &ip->port;
+        if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
+                return;
+
+        if (tty_port_close_start(port, tty, filp) == 0)
+                return;
+        isicom_close_port(port);
         isicom_flush_buffer(tty);
-        
         tty_port_close_end(port, tty);
 }