From: Jiri Slaby Like other drivers silently unregister_tty_driver and put_tty_driver. It shouldn't be busy when module release function is called, since we are not bsd, no refs shouldn't be held. Cc: Alan Cox Signed-off-by: Jiri Slaby Signed-off-by: Andrew Morton --- drivers/char/mxser_new.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff -puN drivers/char/mxser_new.c~char-mxser_new-dont-check-tty_unregister-retval drivers/char/mxser_new.c --- a/drivers/char/mxser_new.c~char-mxser_new-dont-check-tty_unregister-retval +++ a/drivers/char/mxser_new.c @@ -2994,15 +2994,12 @@ static int __init mxser_module_init(void static void __exit mxser_module_exit(void) { - int i, err; + unsigned int i; pr_debug("Unloading module mxser ...\n"); - err = tty_unregister_driver(mxvar_sdriver); - if (!err) - put_tty_driver(mxvar_sdriver); - else - printk(KERN_ERR "Couldn't unregister MOXA Smartio/Industio family serial driver\n"); + tty_unregister_driver(mxvar_sdriver); + put_tty_driver(mxvar_sdriver); for (i = 0; i < MXSER_BOARDS; i++) if (mxser_boards[i].board_type != -1) _