[PATCH 09/13] tty: move some internal tty lock enums and functions out of tty.h

Greg Kroah-Hartman
2021-04-08T12:52:37Z

Move the TTY_LOCK_* enums and tty_ldisc lock functions out of the global
tty.h into the local header file to clean things up.

Cc: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/tty.h | 26 ++++++++++++++++++++++++++
drivers/tty/tty_buffer.c | 2 +-
drivers/tty/tty_mutex.c | 1 +
include/linux/tty.h | 26 --------------------------
4 files changed, 28 insertions(+), 27 deletions(-)

diff --git a/drivers/tty/tty.h b/drivers/tty/tty.h
index a8a7abe5d635..ff904e947483 100644
--- a/drivers/tty/tty.h
+++ b/drivers/tty/tty.h
@@ -6,6 +6,32 @@
#ifndef _TTY_INTERNAL_H
#define _TTY_INTERNAL_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.
+ * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
+ * Subclassing this lock enables the slave pty to hold its
+ * termios_rwsem when claiming the master tty_buffer lock.
+ * tty_buffer lock - slave ptys can claim nested buffer lock when handling
+ * signal chars. The stable lock order is slave pty, then
+ * master.
+ */
+enum {
+ TTY_LOCK_NORMAL = 0,
+ TTY_LOCK_SLAVE,
+};
+
+int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
+void tty_ldisc_unlock(struct tty_struct *tty);
+
/* tty_audit.c */
#ifdef CONFIG_AUDIT
void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size);
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 6d4995a5f318..9733469a14b2 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -17,7 +17,7 @@
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
-
+#include "tty.h"

#define MIN_TTYB_SIZE 256
#define TTYB_ALIGN_MASK 255
diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index 2640635ee177..393518a24cfe 100644
--- a/drivers/tty/tty_mutex.c
+++ b/drivers/tty/tty_mutex.c
@@ -4,6 +4,7 @@
#include <linux/kallsyms.h>
#include <linux/semaphore.h>
#include <linux/sched.h>
+#include "tty.h"

/* Legacy tty mutex glue */

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 981ee31c58e1..4b21d47bc098 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -16,30 +16,6 @@
#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.
- * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
- * Subclassing this lock enables the slave pty to hold its
- * termios_rwsem when claiming the master tty_buffer lock.
- * tty_buffer lock - slave ptys can claim nested buffer lock when handling
- * signal chars. The stable lock order is slave pty, then
- * master.
- */
-
-enum {
- TTY_LOCK_NORMAL = 0,
- TTY_LOCK_SLAVE,
-};
-
/*
* (Note: the *_driver.minor_start values 1, 64, 128, 192 are
* hardcoded at present.)
@@ -419,8 +395,6 @@ extern struct tty_struct *tty_kopen_exclusive(dev_t device);
extern struct tty_struct *tty_kopen_shared(dev_t device);
extern void tty_kclose(struct tty_struct *tty);
extern int tty_dev_name_to_number(const char *name, dev_t *number);
-extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
-extern void tty_ldisc_unlock(struct tty_struct *tty);
extern ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *);
extern struct file *tty_release_redirect(struct tty_struct *tty);
#else
--
2.31.1