linux-kernel - [PATCH -next v2 16/26] tty: Simplify tty_release

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Message-Id: <1415207589-15967-17-git-send-email-peter@hurleysoftware.com>
Date:	Wed,  5 Nov 2014 12:12:59 -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 16/26] tty: Simplify tty_release_checks() interface

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

Reviewed-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_io.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 4034e5e..c765260 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1702,8 +1702,7 @@ static void release_tty(struct tty_struct *tty, int idx)
  *	Performs some paranoid checking before true release of the @tty.
  *	This is a no-op unless TTY_PARANOIA_CHECK is defined.
  */
-static int tty_release_checks(struct tty_struct *tty, struct tty_struct *o_tty,
-		int idx)
+static int tty_release_checks(struct tty_struct *tty, int idx)
 {
 #ifdef TTY_PARANOIA_CHECK
 	if (idx < 0 || idx >= tty->driver->num) {
@@ -1722,6 +1721,8 @@ static int tty_release_checks(struct tty_struct *tty, struct tty_struct *o_tty,
 		return -1;
 	}
 	if (tty->driver->other) {
+		struct tty_struct *o_tty = tty->link;
+
 		if (o_tty != tty->driver->other->ttys[idx]) {
 			printk(KERN_DEBUG "%s: other->table[%d] not o_tty for (%s)\n",
 					__func__, idx, tty->name);
@@ -1779,7 +1780,7 @@ int tty_release(struct inode *inode, struct file *filp)
 	/* Review: parallel close */
 	o_tty = tty->link;
 
-	if (tty_release_checks(tty, o_tty, idx)) {
+	if (tty_release_checks(tty, idx)) {
 		tty_unlock(tty);
 		return 0;
 	}
-- 
2.1.3

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