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: Trishansh Bhardwaj <tbhardwa@codeaurora.org>

parent 6319cf03

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

+1 −3

Original line number	Diff line number	Diff line
		@@ -1012,11 +1012,9 @@ 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);