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Subject[PATCH 28/41] TTY: synclink_cs, use dynamic tty devices
Date
This allows us to provide the tty layer with information about
tty_port for each link. And it also allows us to get rid of the
remove_device loop in synclink_cs_exit because we had to reorder
pcmcia and tty driver registration in init. This was because we need
to have serial_driver initialized when calling
tty_port_register_device from pcmcia ->probe.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/char/pcmcia/synclink_cs.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 0606586..ce277f7 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -2731,6 +2731,8 @@ static void mgslpc_add_device(MGSLPC_INFO *info)
#if SYNCLINK_GENERIC_HDLC
hdlcdev_init(info);
#endif
+ tty_port_register_device(&info->port, serial_driver, info->line,
+ &info->p_dev.dev);
}

static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
@@ -2744,6 +2746,7 @@ static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
last->next_device = info->next_device;
else
mgslpc_device_list = info->next_device;
+ tty_unregister_device(serial_driver, info->line);
#if SYNCLINK_GENERIC_HDLC
hdlcdev_exit(info);
#endif
@@ -2807,13 +2810,12 @@ static int __init synclink_cs_init(void)
BREAKPOINT();
}

- if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
- return rc;
-
- serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
+ serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
+ TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV);
if (!serial_driver) {
rc = -ENOMEM;
- goto err_pcmcia_drv;
+ goto err;
}

/* Initialize the tty_driver structure */
@@ -2827,7 +2829,6 @@ static int __init synclink_cs_init(void)
serial_driver->init_termios = tty_std_termios;
serial_driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- serial_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(serial_driver, &mgslpc_ops);

if ((rc = tty_register_driver(serial_driver)) < 0) {
@@ -2836,26 +2837,28 @@ static int __init synclink_cs_init(void)
goto err_put_tty;
}

+ rc = pcmcia_register_driver(&mgslpc_driver);
+ if (rc < 0)
+ goto err_unreg_tty;
+
printk("%s %s, tty major#%d\n",
driver_name, driver_version,
serial_driver->major);

return 0;
+err_unreg_tty:
+ tty_unregister_driver(serial_driver);
err_put_tty:
put_tty_driver(serial_driver);
-err_pcmcia_drv:
- pcmcia_unregister_driver(&mgslpc_driver);
+err:
return rc;
}

static void __exit synclink_cs_exit(void)
{
- while (mgslpc_device_list)
- mgslpc_remove_device(mgslpc_device_list);
-
+ pcmcia_unregister_driver(&mgslpc_driver);
tty_unregister_driver(serial_driver);
put_tty_driver(serial_driver);
- pcmcia_unregister_driver(&mgslpc_driver);
}

module_init(synclink_cs_init);
--
1.7.10.4



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