This repository has been archived on 2026-03-14. You can view files and clone it, but cannot push or open issues or pull requests.
Files
ubports_kernel_google_msm/include/linux
Jiri Slaby 24d406a6bf TTY: pty, fix pty counting
tty_operations->remove is normally called like:
queue_release_one_tty
 ->tty_shutdown
   ->tty_driver_remove_tty
     ->tty_operations->remove

However tty_shutdown() is called from queue_release_one_tty() only if
tty_operations->shutdown is NULL. But for pty, it is not.
pty_unix98_shutdown() is used there as ->shutdown.

So tty_operations->remove of pty (i.e. pty_unix98_remove()) is never
called. This results in invalid pty_count. I.e. what can be seen in
/proc/sys/kernel/pty/nr.

I see this was already reported at:
  https://lkml.org/lkml/2009/11/5/370
But it was not fixed since then.

This patch is kind of a hackish way. The problem lies in ->install. We
allocate there another tty (so-called tty->link). So ->install is
called once, but ->remove twice, for both tty and tty->link. The fix
here is to count both tty and tty->link and divide the count by 2 for
user.

And to have ->remove called, let's make tty_driver_remove_tty() global
and call that from pty_unix98_shutdown() (tty_operations->shutdown).

While at it, let's document that when ->shutdown is defined,
tty_shutdown() is not called.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 10:10:38 -07:00
..
2011-05-04 14:08:36 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-02-24 19:58:42 +01:00
2011-07-22 08:25:37 -07:00
2010-11-23 20:14:46 +00:00
2011-07-26 16:49:47 -07:00
2011-07-20 20:47:43 -04:00
2011-01-31 14:03:00 -08:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-01-15 20:07:45 -05:00
2011-07-26 16:49:47 -07:00
2011-03-22 17:43:59 -07:00
2011-03-11 14:25:50 +00:00
2011-07-26 16:49:47 -07:00
2011-08-03 11:30:42 -04:00
2011-07-23 20:44:25 +02:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2010-12-16 17:53:38 +01:00
2011-03-31 11:26:23 -03:00
2011-05-26 17:12:34 -07:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-08-03 19:06:37 -04:00
2011-03-22 17:44:15 -07:00
2011-08-07 13:42:35 -07:00
2011-07-26 16:49:47 -07:00
2011-07-06 14:44:42 -07:00
2011-07-25 20:57:16 -07:00
2011-07-05 23:42:17 -07:00
2011-01-10 08:51:44 -08:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-05-23 10:47:06 -05:00
2011-05-29 13:03:09 +01:00
2011-03-10 11:35:17 +01:00
2011-05-24 10:21:29 +02:00
2011-05-24 10:21:29 +02:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-06-25 17:29:52 +02:00
2011-01-12 20:16:43 -05:00
2011-03-14 19:12:20 -04:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-01-10 08:51:44 -08:00
2011-01-07 17:50:27 +11:00
2011-08-06 22:53:23 -07:00
2011-01-07 17:50:23 +11:00
2010-12-07 20:16:56 +01:00
2011-07-01 15:34:45 -07:00
2011-03-31 11:26:23 -03:00
2011-06-28 10:48:34 +02:00
2011-02-23 00:53:26 +00:00
2011-05-25 20:43:32 +02:00
2011-03-31 11:26:23 -03:00
2011-07-01 10:37:15 +02:00
2011-05-08 16:41:45 -07:00
2010-11-16 10:58:30 -08:00
2011-07-06 01:56:38 -07:00
2011-07-21 13:47:54 -07:00
2011-07-26 16:49:47 -07:00
2011-06-14 11:30:22 +02:00
2011-05-26 17:12:37 -07:00
2011-03-31 11:26:23 -03:00
2010-11-24 11:16:42 -08:00
2011-03-31 11:26:23 -03:00
2010-12-09 20:17:07 -08:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-02-17 11:12:40 -08:00
2011-07-26 16:49:47 -07:00
2011-01-13 17:32:31 -08:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-01-13 17:32:47 -08:00
2011-02-13 16:54:24 -08:00
2011-01-24 14:45:11 +10:30
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-05-24 14:33:35 +02:00
2011-04-25 18:14:10 -07:00
2010-12-06 11:03:46 -08:00
2011-08-03 11:30:42 -04:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-07-05 15:26:58 -04:00
2011-07-31 12:18:15 -04:00
2011-07-31 12:18:16 -04:00
2011-07-28 16:19:22 -06:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-01-16 13:47:07 -05:00
2011-07-26 16:49:47 -07:00
2011-05-26 17:12:37 -07:00
2011-03-31 11:26:23 -03:00
2011-05-24 12:10:51 +02:00
2011-01-13 08:03:21 -08:00
2011-03-31 11:26:23 -03:00
2011-07-22 16:14:29 -07:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2010-10-29 04:16:31 -04:00
2011-01-14 02:36:43 +00:00
2011-07-23 07:56:59 +01:00
2010-11-15 13:24:06 -05:00
2011-05-25 08:39:19 -07:00
2011-07-26 16:49:47 -07:00
2011-06-07 10:02:35 +02:00
2011-07-26 16:49:47 -07:00
2010-10-30 12:12:50 +02:00
2011-07-30 08:44:19 -10:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-07-05 15:26:58 -04:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-07-25 20:57:11 -07:00
2011-07-26 16:49:47 -07:00
2011-08-03 14:25:22 -10:00
2011-07-26 16:49:47 -07:00
2011-02-02 15:28:18 +01:00
2011-06-15 20:03:59 -07:00
2010-11-29 08:55:25 +11:00
2010-11-29 08:55:22 +11:00
2011-06-27 20:30:08 +02:00
2011-08-23 10:10:38 -07:00
2011-08-23 10:10:38 -07:00
2011-03-31 11:26:23 -03:00
2010-12-20 09:37:33 +01:00
2011-06-07 09:05:42 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-05-30 11:14:16 +09:30
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-01-13 08:03:24 -08:00