Jiri Slaby a38df1a013
TTY: pty, fix pty counting ...
commit 24d406a6bf736f7aebdc8fa0f0ec86e0890c6d24 upstream.
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 >
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de >
2011-10-03 11:39:49 -07:00
2011-06-16 12:01:57 -07:00
2011-05-11 14:50:41 -04:00
2011-01-30 01:14:14 -08:00
2011-05-04 14:08:36 -07:00
2011-05-24 11:52:05 -07:00
2011-03-31 11:26:23 -03:00
2011-05-20 18:51:09 -03:00
2011-06-15 20:03:59 -07:00
2011-06-20 08:59:46 -07:00
2011-03-31 11:26:23 -03:00
2011-07-08 21:14:44 -07:00
2011-03-23 12:24:23 -07:00
2011-07-13 14:54:37 -04:00
2011-06-01 11:36:49 +01:00
2011-06-06 01:35:10 +02:00
2011-03-31 11:26:23 -03:00
2011-01-20 17:50:17 +01:00
2011-01-20 17:50:17 +01:00
2011-01-13 08:03:19 -08:00
2011-03-31 11:26:23 -03:00
2011-03-16 15:11:04 -07:00
2011-04-20 17:48:49 +04:00
2011-03-31 11:26:23 -03:00
2011-05-27 10:34:37 +01:00
2011-05-26 12:13:22 -07:00
2011-05-20 13:43:21 -07:00
2011-06-21 18:20:55 -07:00
2011-01-13 08:03:08 -08:00
2011-05-23 12:33:02 -07:00
2011-03-31 11:26:23 -03:00
2011-02-24 19:58:42 +01:00
2011-04-01 02:24:31 -04:00
2011-03-21 22:59:08 -04:00
2011-04-28 13:39:17 -07:00
2011-03-15 02:42:32 -04:00
2011-01-31 14:03:00 -08:00
2011-04-25 14:50:08 -04:00
2011-03-30 16:53:38 -07:00
2011-05-28 17:41:46 +02:00
2011-01-19 23:51:37 +01:00
2011-01-15 20:07:45 -05:00
2011-03-10 08:52:07 +01:00
2011-03-22 17:43:59 -07:00
2011-06-10 08:46:26 -06:00
2011-03-11 14:25:50 +00:00
2011-01-10 13:31:14 -08:00
2011-04-09 15:53:56 +02:00
2011-03-08 08:28:01 +01:00
2011-04-25 18:10:58 -07:00
2011-05-25 08:39:45 -07:00
2011-05-26 17:12:38 -07:00
2011-06-20 13:23:14 +02:00
2011-05-31 13:45:53 +02:00
2011-06-13 10:42:49 +02:00
2011-05-25 08:39:30 -07:00
2011-05-19 16:55:27 +09:30
2011-05-26 07:26:45 -04:00
2011-05-25 08:39:43 -07:00
2011-05-24 22:55:24 +10:00
2011-01-13 08:03:17 -08:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-05-26 17:12:34 -07:00
2011-05-26 17:12:34 -07:00
2011-05-26 10:01:36 -06:00
2011-05-19 14:24:16 +02:00
2011-06-16 19:30:53 +02:00
2011-03-31 11:26:23 -03:00
2011-03-22 17:44:00 -07:00
2011-06-27 18:00:13 -07:00
2011-03-22 17:44:10 -07:00
2011-05-25 08:39:47 -07:00
2011-05-25 08:39:46 -07:00
2011-03-31 11:26:23 -03:00
2011-06-07 12:02:00 -07:00
2011-01-26 10:50:06 +10:00
2011-03-31 11:26:23 -03:00
2011-01-24 14:51:56 -08:00
2011-05-04 11:50:57 -04:00
2011-01-12 12:47:34 -05:00
2011-05-25 08:39:45 -07:00
2011-05-28 17:02:57 +02:00
2011-01-13 08:03:22 -08:00
2011-05-26 17:12:37 -07:00
2011-03-22 17:44:15 -07:00
2011-05-19 15:59:38 -07:00
2011-08-15 18:31:35 -07:00
2011-01-13 08:03:13 -08:00
2011-03-22 19:25:05 -07:00
2011-04-24 07:58:46 -07:00
2011-03-14 17:02:43 -07:00
2011-01-20 17:01:09 -08:00
2011-03-08 16:10:38 +01:00
2011-06-20 10:46:04 -04:00
2011-05-29 12:52:55 +01:00
2011-06-27 16:06:19 -07:00
2011-05-23 10:47:06 -05:00
2011-05-29 13:03:09 +01:00
2011-03-24 13:54:30 +00:00
2011-05-29 13:03:13 +01:00
2011-01-13 19:59:52 +00:00
2011-06-01 12:26:35 +01:00
2011-03-31 11:26:23 -03:00
2011-02-25 12:00:34 -08:00
2011-06-30 09:23:45 +02:00
2011-03-10 11:35:17 +01:00
2011-05-24 10:21:29 +02:00
2011-05-24 10:21:29 +02:00
2011-05-25 18:30:37 +05:30
2011-04-04 12:48:08 -04:00
2011-05-25 17:03:53 -07:00
2011-04-05 23:51:37 +02:00
2011-05-14 21:36:55 +01:00
2011-03-22 17:44:11 -07:00
2011-01-13 21:49:56 -08:00
2011-06-09 15:05:48 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-05-27 07:04:40 -04:00
2011-01-12 20:16:43 -05:00
2011-05-12 07:37:51 -07:00
2011-03-14 19:12:20 -04:00
2011-03-15 02:21:45 -04:00
2011-05-22 21:01:22 -04:00
2011-08-04 21:58:34 -07:00
2011-05-10 22:53:46 +02:00
2011-02-03 15:39:17 -08:00
2011-05-26 17:12:33 -07:00
2011-02-16 17:48:59 +01:00
2011-06-27 18:00:13 -07:00
2011-05-25 08:39:44 -07:00
2011-07-07 13:21:56 -07:00
2011-05-02 16:59:38 -07:00
2011-06-24 17:08:49 +09:00
2011-05-25 22:13:44 -04:00
2011-05-18 19:22:52 -04:00
2011-05-25 08:39:54 -07:00
2011-05-30 07:42:51 +02:00
2011-05-25 08:39:11 -07:00
2011-04-11 23:53:19 -07:00
2011-01-10 22:11:23 +01:00
2011-06-16 08:40:52 -06:00
2011-03-05 10:56:00 +01:00
2011-02-03 16:37:28 +01:00
2011-03-31 11:26:23 -03:00
2011-02-11 15:05:49 +01:00
2011-03-31 11:26:23 -03:00
2011-06-27 16:06:19 -07:00
2011-05-25 08:39:19 -07:00
2011-05-26 09:20:31 -07:00
2011-05-26 12:03:50 -07:00
2011-02-17 09:52:03 -08:00
2011-02-23 00:53:26 +00:00
2011-05-25 20:43:32 +02:00
2011-03-31 11:26:23 -03:00
2011-03-12 15:08:54 -08:00
2011-05-08 16:41:45 -07:00
2011-06-01 14:34:01 -04:00
2011-01-11 23:55:51 +01:00
2011-05-27 13:40:54 -04:00
2011-05-10 14:36:03 -07:00
2011-06-06 22:42:06 -07:00
2011-03-18 15:14:45 -07:00
2011-06-11 16:15:50 -07:00
2011-08-15 18:31:38 -07:00
2011-03-10 16:37:26 -08:00
2011-02-10 07:51:44 -05:00
2011-02-18 12:42:28 -08:00
2011-05-26 17:12:34 -07:00
2011-05-16 14:46:30 -04:00
2011-01-31 21:17:41 -08:00
2011-04-18 13:29:03 -07:00
2011-06-14 15:25:39 -07:00
2011-03-23 19:47:08 -07:00
2011-05-26 17:12:37 -07:00
2011-03-31 11:26:23 -03:00
2011-07-07 16:02:26 +00:00
2011-05-18 14:59:08 +02:00
2011-06-03 14:53:15 +02:00
2011-03-31 11:26:23 -03:00
2011-06-13 15:38:22 -04:00
2011-03-31 11:26:23 -03:00
2011-03-20 20:08:48 -04:00
2011-04-04 12:48:08 -04:00
2011-03-24 08:36:10 +01:00
2011-03-22 16:17:32 -07:00
2011-05-25 16:55:55 -07:00
2011-02-17 11:12:40 -08:00
2011-01-13 17:32:31 -08:00
2011-06-15 20:04:00 -07:00
2011-04-01 16:14:30 +11:00
2011-03-08 11:17:18 +11:00
2011-05-27 10:25:02 -07:00
2011-03-08 11:17:22 +11:00
2011-03-18 16:54:31 +00:00
2011-01-13 17:32:47 -08:00
2011-02-13 16:54:24 -08:00
2011-01-24 14:45:11 +10:30
2011-06-17 09:40:48 -07:00
2011-06-15 20:03:59 -07:00
2011-06-12 17:45:41 -04:00
2011-02-18 08:02:10 -08:00
2011-03-22 17:44:01 -07:00
2011-03-31 11:26:23 -03:00
2011-05-23 15:39:34 -07:00
2011-01-12 11:23:08 +02:00
2011-05-22 08:47:53 -04:00
2011-03-31 11:26:23 -03:00
2011-01-13 08:03:06 -08:00
2011-01-13 08:03:05 -08:00
2011-05-25 08:39:50 -07:00
2011-04-13 11:11:43 +02:00
2011-05-25 08:39:51 -07:00
2011-05-19 20:50:53 -04:00
2011-05-24 14:33:35 +02:00
2011-04-25 18:14:10 -07:00
2011-05-19 14:15:29 -07:00
2011-05-25 08:39:17 -07:00
2011-05-24 10:01:37 +02:00
2011-04-25 18:14:07 -04:00
2011-03-18 22:33:38 -07:00
2011-01-10 19:04:08 +01:00
2011-03-22 04:53:56 -03:00
2011-05-25 08:39:48 -07:00
2011-06-15 20:03:59 -07:00
2011-01-15 13:28:17 +02:00
2011-07-12 11:08:01 +10:00
2011-05-25 08:39:34 -07:00
2011-02-14 17:38:30 -08:00
2011-01-13 17:32:34 -08:00
2011-01-13 17:32:46 -08:00
2011-05-29 11:32:28 -07:00
2011-08-15 18:31:43 -07:00
2011-05-25 08:39:19 -07:00
2011-06-27 14:13:09 -07:00
2011-05-10 15:54:54 -04:00
2011-05-19 16:55:27 +09:30
2011-05-19 16:55:25 +09:30
2011-01-16 13:47:07 -05:00
2011-03-31 11:26:23 -03:00
2011-05-04 12:18:54 -07:00
2011-03-02 13:43:15 -08:00
2011-05-25 08:39:17 -07:00
2011-05-09 11:40:38 +10:00
2011-03-18 09:04:20 -04:00
2011-01-12 20:03:43 -05:00
2011-01-12 20:03:43 -05:00
2011-05-27 13:41:33 -04:00
2011-08-04 21:58:31 -07:00
2011-05-27 13:40:58 -04:00
2011-05-20 11:46:11 -07:00
2011-05-29 14:10:13 -07:00
2011-04-24 14:28:18 -04:00
2011-08-04 21:58:40 -07:00
2011-03-11 15:39:26 -05:00
2011-03-11 15:38:44 -05:00
2011-06-20 16:12:26 -04:00
2011-08-04 21:58:37 -07:00
2011-01-25 15:24:47 -05:00
2011-05-10 22:21:45 +09:00
2011-05-16 19:32:19 -04:00
2011-05-23 11:58:59 +02:00
2011-02-03 16:08:57 -08:00
2011-05-22 21:01:19 -04:00
2011-05-26 17:12:34 -07:00
2011-05-18 12:32:23 -06:00
2011-01-15 22:01:58 -07:00
2011-04-20 17:01:19 +10:00
2011-02-04 11:46:50 -07:00
2011-03-23 14:55:56 -06:00
2011-03-16 17:28:10 -07:00
2011-03-31 11:26:23 -03:00
2011-05-25 08:39:10 -07:00
2011-02-15 11:10:20 +01:00
2011-03-31 11:26:23 -03:00
2011-05-29 12:40:51 +02:00
2011-05-25 08:39:25 -07:00
2011-03-14 02:58:03 -04:00
2011-01-16 13:47:07 -05:00
2011-06-18 22:18:18 -04:00
2011-05-11 15:18:53 -07:00
2011-01-16 11:56:26 -08:00
2011-05-21 12:16:44 -07:00
2011-04-11 09:01:41 +02:00
2011-05-24 12:06:40 -07:00
2011-05-25 08:39:54 -07:00
2011-06-03 19:33:49 +03:00
2011-06-04 12:31:14 +02:00
2011-08-29 13:29:16 -07:00
2011-03-09 11:59:33 -08:00
2011-05-26 17:12:37 -07:00
2011-04-11 13:44:25 -07:00
2011-05-16 20:17:47 +02:00
2011-03-11 15:13:26 -05:00
2011-05-29 00:50:59 -04:00
2011-04-30 00:25:44 +02:00
2011-03-15 00:43:14 +01:00
2011-06-21 23:20:20 +02:00
2011-05-29 20:52:36 +03:00
2011-03-31 11:26:23 -03:00
2011-01-25 15:24:47 -05:00
2011-05-10 10:16:21 +02:00
2011-05-24 12:10:51 +02:00
2011-03-01 22:27:26 +03:00
2011-01-13 08:03:21 -08:00
2011-01-13 08:03:21 -08:00
2011-03-31 11:26:23 -03:00
2011-05-25 08:39:48 -07:00
2011-05-26 17:12:36 -07:00
2011-05-16 11:05:00 -07:00
2011-05-13 16:31:00 -07:00
2011-05-23 13:01:00 -07:00
2011-05-23 13:01:00 -07:00
2011-05-23 13:01:00 -07:00
2011-04-25 17:28:24 +02:00
2011-03-22 17:44:00 -07:00
2011-03-31 11:26:23 -03:00
2011-01-12 19:14:55 +01:00
2011-03-24 21:16:31 -04:00
2011-01-13 17:32:48 -08:00
2011-08-15 18:31:35 -07:00
2011-05-26 15:00:31 -04:00
2011-04-26 14:01:42 -07:00
2011-01-14 02:36:43 +00:00
2011-05-19 14:15:29 -07:00
2011-05-05 23:16:59 -07:00
2011-05-05 23:16:59 -07:00
2011-05-05 23:16:59 -07:00
2011-03-31 11:26:23 -03:00
2011-02-01 11:12:29 -05:00
2011-03-23 19:46:23 -07:00
2011-05-19 13:53:54 -04:00
2011-04-19 15:38:02 -04:00
2011-03-09 13:52:27 -05:00
2011-03-23 19:46:41 -07:00
2011-04-14 16:06:56 -07:00
2011-10-03 11:39:46 -07:00
2011-04-14 16:06:56 -07:00
2011-05-25 08:39:19 -07:00
2011-01-13 08:03:23 -08:00
2011-05-12 08:28:47 -07:00
2011-05-26 17:12:33 -07:00
2011-01-27 12:30:38 +01:00
2011-01-27 12:30:39 +01:00
2011-01-27 12:30:40 +01:00
2011-07-20 15:56:25 -07:00
2011-07-18 11:06:03 -07:00
2011-04-25 10:20:32 -04:00
2011-06-11 13:17:28 -07:00
2011-05-19 16:51:01 -07:00
2011-05-19 16:51:02 -07:00
2011-01-19 15:37:31 +09:00
2011-06-27 18:00:12 -07:00
2011-05-19 08:19:36 -07:00
2011-03-22 17:44:15 -07:00
2011-05-20 13:33:21 -07:00
2011-06-11 16:15:50 -07:00
2011-01-23 21:00:05 +02:00
2011-05-21 12:53:53 +03:00
2011-03-22 17:16:34 +09:00
2011-03-31 11:26:23 -03:00
2011-06-17 10:17:12 +02:00
2011-04-13 17:13:00 -07:00
2011-05-05 11:10:14 -07:00
2011-03-09 14:08:09 -08:00
2011-03-28 06:05:24 -04:00
2011-03-31 11:26:23 -03:00
2011-01-27 12:30:38 +01:00
2011-05-20 12:51:07 -07:00
2011-03-31 11:26:23 -03:00
2011-05-03 16:09:40 -07:00
2011-08-29 13:29:08 -07:00
2011-05-19 16:55:28 +09:30
2011-04-11 22:54:42 +02:00
2011-03-22 15:47:22 +09:00
2011-06-27 18:00:12 -07:00
2011-06-06 15:41:16 -04:00
2011-05-25 18:10:16 -07:00
2011-03-15 00:43:46 +01:00
2011-03-09 16:43:24 -08:00
2011-05-11 21:37:15 +02:00
2011-06-12 17:45:41 -04:00
2011-01-24 09:33:36 -08:00
2011-02-28 18:00:31 -08:00
2011-05-23 13:59:54 +02:00
2011-04-22 17:01:09 -07:00
2011-05-23 13:59:53 +02:00
2011-05-23 13:59:53 +02:00
2011-04-26 14:01:42 -07:00
2011-02-02 15:28:18 +01:00
2011-03-13 16:35:18 -04:00
2011-05-10 16:03:56 -04:00
2011-06-15 20:03:59 -07:00
2011-01-13 08:03:08 -08:00
2011-05-20 13:33:21 -07:00
2011-04-04 12:48:08 -04:00
2011-10-03 11:39:49 -07:00
2011-06-04 06:33:24 +09:00
2011-10-03 11:39:49 -07:00
2011-03-22 17:44:09 -07:00
2011-05-25 19:56:23 -04:00
2011-03-31 11:26:23 -03:00
2011-06-07 09:05:42 -07:00
2011-04-29 17:24:29 -07:00
2011-01-13 08:03:18 -08:00
2011-06-15 20:04:00 -07:00
2011-03-23 19:47:03 -07:00
2011-05-20 09:30:46 -03:00
2011-03-31 11:26:23 -03:00
2011-05-20 11:28:49 -03:00
2011-03-22 04:53:33 -03:00
2011-03-31 11:26:23 -03:00
2011-05-20 12:17:35 -03:00
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:14 +09:30
2011-05-30 11:14:16 +09:30
2011-05-26 17:12:34 -07:00
2011-03-28 12:53:29 +01:00
2011-05-26 17:12:34 -07:00
2011-02-17 11:13:19 -08:00
2011-03-31 11:26:23 -03:00
2011-04-19 16:49:20 +03:00
2011-02-21 10:07:23 +01:00
2011-03-24 21:17:51 -04:00
2011-05-25 08:39:45 -07:00
2011-03-13 20:22:28 -07:00
2011-03-31 11:26:23 -03:00
2011-01-13 08:03:24 -08:00
2011-03-22 17:44:17 -07:00
a38df1a013