linux-kernel - [PATCH -next v2 15/26] tty: Simplify tty_ldisc

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Date:	Wed,  5 Nov 2014 12:12:58 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH -next v2 15/26] tty: Simplify tty_ldisc_release() interface

Passing the 'other' tty to tty_ldisc_release() only makes sense
for a pty pair; make o_tty function local instead.

Reviewed-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_io.c    |  2 +-
 drivers/tty/tty_ldisc.c | 15 +++++++--------
 include/linux/tty.h     |  2 +-
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 563ab37..4034e5e 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1901,7 +1901,7 @@ int tty_release(struct inode *inode, struct file *filp)
 	/*
 	 * Ask the line discipline code to release its structures
 	 */
-	tty_ldisc_release(tty, o_tty);
+	tty_ldisc_release(tty);
 
 	/* Wait for pending work before tty destruction commmences */
 	tty_flush_works(tty);
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 49001fa..1c4d7b6 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -756,18 +756,17 @@ static void tty_ldisc_kill(struct tty_struct *tty)
 
 /**
  *	tty_ldisc_release		-	release line discipline
- *	@tty: tty being shut down
- *	@o_tty: pair tty for pty/tty pairs
- *
- *	Called during the final close of a tty/pty pair in order to shut down
- *	the line discpline layer. On exit the ldisc assigned is N_TTY and the
- *	ldisc has not been opened.
+ *	@tty: tty being shut down (or one end of pty pair)
  *
- *	Holding ldisc_sem write lock serializes tty->ldisc changes.
+ *	Called during the final close of a tty or a pty pair in order to shut
+ *	down the line discpline layer. On exit, each ldisc assigned is N_TTY and
+ *	each ldisc has not been opened.
  */
 
-void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
+void tty_ldisc_release(struct tty_struct *tty)
 {
+	struct tty_struct *o_tty = tty->link;
+
 	/*
 	 * Shutdown this line discipline. As this is the final close,
 	 * it does not race with the set_ldisc code path.
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 35b29f0..af1a7f3 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -557,7 +557,7 @@ extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 extern int tty_unregister_ldisc(int disc);
 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
-extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
+extern void tty_ldisc_release(struct tty_struct *tty);
 extern void tty_ldisc_init(struct tty_struct *tty);
 extern void tty_ldisc_deinit(struct tty_struct *tty);
 extern void tty_ldisc_begin(void);
-- 
2.1.3

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