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Commit b2b60c0b authored by Trishansh Bhardwaj's avatar Trishansh Bhardwaj
Browse files

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



Use proper synchronization to ensure driver file is opened
only once.

CRs-Fixed: 2023513
Change-Id: I71e55e2d487fe561d3f596590b3e8102c5e921b5
Signed-off-by: default avatarTrishansh Bhardwaj <tbhardwa@codeaurora.org>
parent 68b6c46c

drivers/media/platform/msm/camera_v2/msm.c

+2 −4
Original line number Diff line number Diff line 
/* 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
@@ -997,11 +997,9 @@ static int msm_open(struct file *filep) 
	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);