Revert "tty: hvc: Fix data abort due to race in hvc_open"

This reverts commit e2bd1dcbe1aa34ff5570b3427c530e4332ecf0fe.

In discussion on the mailing list, it has been determined that this is
not the correct type of fix for this issue. Revert it so that we can do
this correctly.

Reported-by: Jiri Slaby <[e-mail]>
Reported-by: Greg Kroah-Hartman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Cc: Raghavendra Rao Ananta <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/hvc/hvc_console.c

···
  */
 static DEFINE_MUTEX(hvc_structs_mutex);
 
-/* Mutex to serialize hvc_open */
-static DEFINE_MUTEX(hvc_open_mutex);
 /*
  * This value is used to assign a tty->index value to a hvc_struct based
  * upon order of exposure via hvc_probe(), when we can not match it to
···
  */
 static int hvc_open(struct tty_struct *tty, struct file * filp)
 {
-	struct hvc_struct *hp;
+	struct hvc_struct *hp = tty->driver_data;
 	unsigned long flags;
 	int rc = 0;
-
-	mutex_lock(&hvc_open_mutex);
-
-	hp = tty->driver_data;
-	if (!hp) {
-		rc = -EIO;
-		goto out;
-	}
 
 	spin_lock_irqsave(&hp->port.lock, flags);
 	/* Check and then increment for fast path open. */
 	if (hp->port.count++ > 0) {
 		spin_unlock_irqrestore(&hp->port.lock, flags);
 		hvc_kick();
-		goto out;
+		return 0;
 	} /* else count == 0 */
 	spin_unlock_irqrestore(&hp->port.lock, flags);
 
···
 	/* Force wakeup of the polling thread */
 	hvc_kick();
 
-out:
-	mutex_unlock(&hvc_open_mutex);
 	return rc;
 }