Files
rockchip-kernel/include/linux
Peter Hurley bee6741ca0 tty, n_tty: Remove fasync() ldisc notification
Only the N_TTY line discipline implements the signal-driven i/o
notification enabled/disabled by fcntl(F_SETFL, O_ASYNC). The ldisc
fasync() notification is sent to the ldisc when the enable state has
changed (the tty core is notified via the fasync() VFS file operation).

The N_TTY line discipline used the enable state to change the wakeup
condition (minimum_to_wake = 1) for notifying the signal handler i/o is
available. However, just the presence of data is sufficient and necessary
to signal i/o is available, so changing minimum_to_wake is unnecessary
(and creates a race condition with read() and poll() which may be
concurrently updating minimum_to_wake).

Furthermore, since the kill_fasync() VFS helper performs no action if
the fasync list is empty, calling unconditionally is preferred; if
signal driven i/o just has been disabled, no signal will be sent by
kill_fasync() anyway so notification of the change via the ldisc
fasync() method is superfluous.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-28 11:58:02 -08:00
..
2016-01-21 19:36:08 +01:00
2015-10-17 21:22:08 -07:00
2015-10-07 18:08:15 +01:00
2016-01-05 18:04:58 +01:00
2015-11-16 15:41:49 +00:00
2015-12-23 08:37:10 -07:00
2015-12-22 09:38:34 -07:00
2015-12-06 12:46:31 +01:00
2015-10-07 16:02:49 -07:00
2015-09-04 16:54:41 -07:00
2016-01-22 17:02:18 -08:00
2015-10-18 10:14:39 -07:00
2015-10-31 19:05:59 -04:00
2016-01-08 01:12:06 +01:00
2015-10-30 01:47:27 -04:00
2015-12-28 13:41:50 +01:00
2016-01-15 17:56:32 -08:00
2015-11-25 09:22:00 -07:00
2015-10-23 05:44:28 -07:00
2016-01-20 17:09:18 -08:00
2015-10-01 15:06:43 +02:00
2015-12-14 10:03:46 +01:00
2016-01-15 17:56:32 -08:00
2016-01-15 17:56:32 -08:00
2015-11-23 09:44:58 +01:00
2016-01-15 17:56:32 -08:00
2015-10-27 18:55:31 -07:00
2015-12-04 22:46:26 +01:00
2015-10-20 22:10:45 +08:00
2016-01-04 13:19:55 -05:00
2015-09-10 13:29:01 -07:00
2015-09-10 13:29:01 -07:00
2016-01-22 17:02:18 -08:00
2016-01-15 17:56:32 -08:00
2016-01-07 14:31:27 -05:00
2015-10-06 17:08:19 +02:00
2015-10-22 08:59:18 -07:00
2015-11-16 09:23:47 +01:00
2016-01-15 17:56:32 -08:00
2016-01-10 22:13:15 -05:00
2015-12-13 19:59:48 -08:00
2016-01-04 16:11:11 -05:00
2016-01-04 10:20:19 -05:00
2015-11-05 14:36:09 -05:00
2016-01-15 22:34:39 +01:00
2015-10-01 09:57:59 -07:00
2015-10-19 01:01:21 +02:00
2016-01-27 16:41:04 -08:00
2015-11-23 09:44:58 +01:00
2015-12-21 15:28:11 -07:00
2016-01-12 20:47:02 +02:00
2016-01-15 17:56:32 -08:00
2016-01-14 16:00:49 -08:00
2015-12-03 07:24:29 -08:00
2015-09-08 15:35:28 -07:00