tty: Introduce some close helpers for ports

Again this is a lot of common code we can unify

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 55 deletions

diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 0ded4ed3da3c..fbd5a5ce2e1c 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -3104,70 +3104,18 @@ static void mgsl_close(struct tty_struct *tty, struct file * filp)
         if (debug_level >= DEBUG_LEVEL_INFO)
                 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
                          __FILE__,__LINE__, info->device_name, info->port.count);
-                         
-        if (!info->port.count)
-                return;
 
-        if (tty_hung_up_p(filp))
+        if (tty_port_close_start(&info->port, tty, filp) == 0)                   
                 goto cleanup;
                         
-        if ((tty->count == 1) && (info->port.count != 1)) {
-                /*
-                 * tty->count is 1 and the tty structure will be freed.
-                 * info->port.count should be one in this case.
-                 * if it's not, correct it so that the port is shutdown.
-                 */
-                printk("mgsl_close: bad refcount; tty->count is 1, "
-                       "info->port.count is %d\n", info->port.count);
-                info->port.count = 1;
-        }
-        
-        info->port.count--;
-        
-        /* if at least one open remaining, leave hardware active */
-        if (info->port.count)
-                goto cleanup;
-        
-        info->port.flags |= ASYNC_CLOSING;
-        
-        /* set tty->closing to notify line discipline to 
-         * only process XON/XOFF characters. Only the N_TTY
-         * discipline appears to use this (ppp does not).
-         */
-        tty->closing = 1;
-        
-        /* wait for transmit data to clear all layers */
-        
-        if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
-                if (debug_level >= DEBUG_LEVEL_INFO)
-                        printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
-                                 __FILE__,__LINE__, info->device_name );
-                tty_wait_until_sent(tty, info->port.closing_wait);
-        }
-                
         if (info->port.flags & ASYNC_INITIALIZED)
                 mgsl_wait_until_sent(tty, info->timeout);
-
         mgsl_flush_buffer(tty);
-
         tty_ldisc_flush(tty);
-                
         shutdown(info);
-        
-        tty->closing = 0;
+
+        tty_port_close_end(&info->port, tty);   
         info->port.tty = NULL;
-        
-        if (info->port.blocked_open) {
-                if (info->port.close_delay) {
-                        msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
-                }
-                wake_up_interruptible(&info->port.open_wait);
-        }
-        
-        info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
-                         
-        wake_up_interruptible(&info->port.close_wait);
-        
 cleanup:                        
         if (debug_level >= DEBUG_LEVEL_INFO)
                 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,