Re: [2.1.113] What is CHECK_TTY_COUNT warning me about?

Theodore Y. Ts'o (tytso@mit.edu)
Fri, 7 Aug 1998 12:23:13 -0400

At least some (if not most) of the recent CHECK_TTY_COUNTS appear to be
caused by the syscons patch which went in. I'm not yet 100% convinced
that this solves all of the problems though, although it probably
accounts for at least 90% of the cases reported in the last few weeks.

Could folks try applying this patch (which was developed by Miquel van
Smoorenburg <miquels@cistron.nl>), and see if it makes the problem go
away?

If you can still easily the "tty count" problem after applying this
patch, I definitely want to hear about it. As always, please send as
much details as possible of your system. Thanks!!

- Ted

--- linux-2.1.113/drivers/char/tty_io.c.orig Mon Aug 3 20:44:21 1998
+++ linux-2.1.113/drivers/char/tty_io.c Mon Aug 3 21:11:08 1998
@@ -375,8 +375,10 @@
{
struct tty_struct *tty = (struct tty_struct *) data;
struct file * filp;
+ struct file * cons_filp = NULL;
struct task_struct *p;
unsigned long flags;
+ int closecount = 0, n;

if (!tty)
return;
@@ -392,10 +394,13 @@
if (!filp->f_dentry->d_inode)
continue;
if (filp->f_dentry->d_inode->i_rdev == CONSOLE_DEV ||
- filp->f_dentry->d_inode->i_rdev == SYSCONS_DEV)
+ filp->f_dentry->d_inode->i_rdev == SYSCONS_DEV) {
+ cons_filp = filp;
continue;
+ }
if (filp->f_op != &tty_fops)
continue;
+ closecount++;
tty_fasync(filp, 0);
filp->f_op = &hung_up_tty_fops;
}
@@ -447,7 +452,11 @@
tty->session = 0;
tty->pgrp = -1;
tty->ctrl_status = 0;
- if (tty->driver.hangup)
+ if (cons_filp) {
+ if (tty->driver.close)
+ for (n = 0; n < closecount; n++)
+ tty->driver.close(tty, cons_filp);
+ } else if (tty->driver.hangup)
(tty->driver.hangup)(tty);
restore_flags(flags);
}

-
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