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Subject[PATCH 1/3] tty: Make lock subclasses available for other tty locks
Date
Besides nested legacy_mutex locking which is required on pty pair
teardown, other nested pty operations require lock subclassing.

Move lock subclass definition to tty interface header, include/linux/tty.h,
and document its use.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/tty_mutex.c | 12 +-----------
include/linux/tty.h | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index a872389..0efcf71 100644
--- a/drivers/tty/tty_mutex.c
+++ b/drivers/tty/tty_mutex.c
@@ -4,18 +4,8 @@
#include <linux/semaphore.h>
#include <linux/sched.h>

-/*
- * Nested tty locks are necessary for releasing pty pairs.
- * The stable lock order is master pty first, then slave pty.
- */
-
/* Legacy tty mutex glue */

-enum {
- TTY_MUTEX_NORMAL,
- TTY_MUTEX_SLAVE,
-};
-
/*
* Getting the big tty mutex.
*/
@@ -58,5 +48,5 @@ void __lockfunc tty_unlock_slave(struct tty_struct *tty)

void tty_set_lock_subclass(struct tty_struct *tty)
{
- lockdep_set_subclass(&tty->legacy_mutex, TTY_MUTEX_SLAVE);
+ lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
}
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 09da425..4c1c453 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -14,6 +14,23 @@
#include <linux/llist.h>


+/*
+ * Lock subclasses for tty locks
+ *
+ * TTY_LOCK_NORMAL is for normal ttys and master ptys.
+ * TTY_LOCK_SLAVE is for slave ptys only.
+ *
+ * Lock subclasses are necessary for handling nested locking with pty pairs.
+ * tty locks which use nested locking:
+ *
+ * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
+ * The stable lock order is master pty first, then slave pty.
+ */
+
+enum {
+ TTY_LOCK_NORMAL = 0,
+ TTY_LOCK_SLAVE,
+};

/*
* (Note: the *_driver.minor_start values 1, 64, 128, 192 are
--
2.2.2


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