linux-kernel - [PATCH 3/4] tty: n_gsm: Remove an unused lock

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Message-ID: <20180426055337.GB15229@mwanda>
Date:   Thu, 26 Apr 2018 08:53:37 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sun Peng <sun_peng@...sec.com.cn>
Cc:     Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
        security@...nel.org, Tony Lindgren <tony@...mide.com>,
        Lars Poeschel <poeschel@...onage.de>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 3/4] tty: n_gsm: Remove an unused lock

We don't use this spin_lock so we can remove the dead code.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 1f2fd9e76fe0..44e9c5e3dbc1 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -177,7 +177,6 @@ struct gsm_control {
 
 struct gsm_mux {
 	struct tty_struct *tty;		/* The tty our ldisc is bound to */
-	spinlock_t lock;
 	struct mutex mutex;
 	unsigned int num;
 	struct kref ref;
@@ -2188,7 +2187,6 @@ static struct gsm_mux *gsm_alloc_mux(void)
 		kfree(gsm);
 		return NULL;
 	}
-	spin_lock_init(&gsm->lock);
 	mutex_init(&gsm->mutex);
 	kref_init(&gsm->ref);
 	INIT_LIST_HEAD(&gsm->tx_list);