TTY: synclink, add tty install

This has two outcomes:
* we give the TTY layer a tty_port
* we do not find the info structure every time open is called on that
  tty

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 991bae8..666aa14 100644 (file)
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -3362,6 +3362,29 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
        
 }      /* end of block_til_ready() */
 
+static int mgsl_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+       struct mgsl_struct *info;
+       int line = tty->index;
+
+       /* verify range of specified line number */
+       if (line >= mgsl_device_count) {
+               printk("%s(%d):mgsl_open with invalid line #%d.\n",
+                       __FILE__, __LINE__, line);
+               return -ENODEV;
+       }
+
+       /* find the info structure for the specified line */
+       info = mgsl_device_list;
+       while (info && info->line != line)
+               info = info->next_device;
+       if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
+               return -ENODEV;
+       tty->driver_data = info;
+
+       return tty_port_install(&info->port, driver, tty);
+}
+
 /* mgsl_open()
  *
  *     Called when a port is opened.  Init and enable port.
@@ -3374,26 +3397,10 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
  */
 static int mgsl_open(struct tty_struct *tty, struct file * filp)
 {
-       struct mgsl_struct      *info;
-       int                     retval, line;
+       struct mgsl_struct *info = tty->driver_data;
        unsigned long flags;
+       int retval;
 
-       /* verify range of specified line number */     
-       line = tty->index;
-       if (line >= mgsl_device_count) {
-               printk("%s(%d):mgsl_open with invalid line #%d.\n",
-                       __FILE__,__LINE__,line);
-               return -ENODEV;
-       }
-
-       /* find the info structure for the specified line */
-       info = mgsl_device_list;
-       while(info && info->line != line)
-               info = info->next_device;
-       if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
-               return -ENODEV;
-       
-       tty->driver_data = info;
        info->port.tty = tty;
                
        if (debug_level >= DEBUG_LEVEL_INFO)
@@ -4297,6 +4304,7 @@ static struct mgsl_struct* mgsl_allocate_device(void)
 }      /* end of mgsl_allocate_device()*/
 
 static const struct tty_operations mgsl_ops = {
+       .install = mgsl_install,
        .open = mgsl_open,
        .close = mgsl_close,
        .write = mgsl_write,