Merge "msm: camera: Allow driver file to be opend only once."

/* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

	BUG_ON(!pvdev);

	/* !!! only ONE open is allowed !!! */

	if (atomic_read(&pvdev->opened))

	if (atomic_cmpxchg(&pvdev->opened, 0, 1))

		return -EBUSY;

	atomic_set(&pvdev->opened, 1);

	spin_lock_irqsave(&msm_pid_lock, flags);

	msm_pid = get_pid(task_pid(current));

	spin_unlock_irqrestore(&msm_pid_lock, flags);