linux-kernel - [PATCH 78/80] fs3270: remove extra locks

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Message-ID: <20081013094542.21645.48171.stgit@localhost.localdomain>
Date:	Mon, 13 Oct 2008 10:45:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 78/80] fs3270: remove extra locks

From: Alan Cox <alan@...hat.com>

get_current_tty now does internal locking and returns a referenced object,
thus our use of tty_mutex here can go away.

Signed-off-by: Alan Cox <alan@...hat.com>
---

 drivers/s390/char/fs3270.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)


diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index 84fbc90..1227f45 100644
--- a/drivers/s390/char/fs3270.c
+++ b/drivers/s390/char/fs3270.c
@@ -426,18 +426,14 @@ fs3270_open(struct inode *inode, struct file *filp)
 	minor = iminor(filp->f_path.dentry->d_inode);
 	/* Check for minor 0 multiplexer. */
 	if (minor == 0) {
-		struct tty_struct *tty;
-		mutex_lock(&tty_mutex);
-		tty = get_current_tty();
+		struct tty_struct *tty = get_current_tty();
 		if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
 			tty_kref_put(tty);
-			mutex_unlock(&tty_mutex);
 			rc = -ENODEV;
 			goto out;
 		}
 		minor = tty->index + RAW3270_FIRSTMINOR;
 		tty_kref_put(tty);
-		mutex_unlock(&tty_mutex);
 	}
 	/* Check if some other program is already using fullscreen mode. */
 	fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);

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