[PATCH] Char: mxser_new, register tty devices on the fly

Register tty indexes only for real devices, udev then creates nodes for them
(and only for them).  Move tty_register_driver before probing, to be correct
when calling tty_register_device.  Also tell tty layer by tty_driver flags,
that we are registering devices.

Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 27 insertions, 11 deletions

diff --git a/drivers/char/mxser_new.c b/drivers/char/mxser_new.c
index 27871e503d80..e665dfccd956 100644
--- a/drivers/char/mxser_new.c
+++ b/drivers/char/mxser_new.c
@@ -2830,12 +2830,19 @@ static int __init mxser_module_init(void)
         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
         mxvar_sdriver->init_termios = tty_std_termios;
         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
-        mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW;
+        mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
         tty_set_operations(mxvar_sdriver, &mxser_ops);
         mxvar_sdriver->ttys = mxvar_tty;
         mxvar_sdriver->termios = mxvar_termios;
         mxvar_sdriver->termios_locked = mxvar_termios_locked;
 
+        retval = tty_register_driver(mxvar_sdriver);
+        if (retval) {
+                printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
+                                "tty driver !\n");
+                goto err_put;
+        }
+
         mxvar_diagflag = 0;
 
         m = 0;
@@ -2885,6 +2892,10 @@ static int __init mxser_module_init(void)
                         if (mxser_initbrd(brd) < 0)
                                 continue;
 
+                        for (i = 0; i < brd->nports; i++)
+                                tty_register_device(mxvar_sdriver,
+                                        m * MXSER_PORTS_PER_BOARD + i, NULL);
+
                         m++;
                 }
 
@@ -2939,6 +2950,11 @@ static int __init mxser_module_init(void)
                         /* mxser_initbrd will hook ISR. */
                         if (mxser_initbrd(brd) < 0)
                                 continue;
+                        for (i = 0; i < brd->nports; i++)
+                                tty_register_device(mxvar_sdriver,
+                                        m * MXSER_PORTS_PER_BOARD + i,
+                                        &pdev->dev);
+
                         m++;
                         /* Keep an extra reference if we succeeded. It will
                            be returned at unload time */
@@ -2946,20 +2962,18 @@ static int __init mxser_module_init(void)
                 }
         }
 
-        retval = tty_register_driver(mxvar_sdriver);
-        if (retval) {
-                printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family"
-                                " driver !\n");
-                put_tty_driver(mxvar_sdriver);
-
-                for (i = 0; i < MXSER_BOARDS; i++)
-                        if (mxser_boards[i].board_type != -1)
-                                mxser_release_res(&mxser_boards[i], 1);
-                return retval;
+        if (!m) {
+                retval = -ENODEV;
+                goto err_unr;
         }
 
         pr_debug("Done.\n");
 
+        return 0;
+err_unr:
+        tty_unregister_driver(mxvar_sdriver);
+err_put:
+        put_tty_driver(mxvar_sdriver);
         return retval;
 }
 
@@ -2969,6 +2983,8 @@ static void __exit mxser_module_exit(void)
 
         pr_debug("Unloading module mxser ...\n");
 
+        for (i = 0; i < MXSER_PORTS; i++)
+                tty_unregister_device(mxvar_sdriver, i);
         tty_unregister_driver(mxvar_sdriver);
         put_tty_driver(mxvar_sdriver);