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https://github.com/Divested-Mobile/DivestOS-Build.git
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36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
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From 84f8c42e5d848b1d04f49d253f98296e8c2280b9 Mon Sep 17 00:00:00 2001
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From: Trishansh Bhardwaj <tbhardwa@codeaurora.org>
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Date: Fri, 7 Apr 2017 11:16:29 +0530
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Subject: msm: camera: Allow driver file to be opend only once.
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Use proper synchronization to ensure driver file is opened
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only once.
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CRs-Fixed: 2023513
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Change-Id: I71e55e2d487fe561d3f596590b3e8102c5e921b5
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Signed-off-by: Trishansh Bhardwaj <tbhardwa@codeaurora.org>
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---
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drivers/media/platform/msm/camera_v2/msm.c | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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diff --git a/drivers/media/platform/msm/camera_v2/msm.c b/drivers/media/platform/msm/camera_v2/msm.c
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index c2b42a8..d8bdef5 100644
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--- a/drivers/media/platform/msm/camera_v2/msm.c
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+++ b/drivers/media/platform/msm/camera_v2/msm.c
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@@ -1012,11 +1012,9 @@ static int msm_open(struct file *filep)
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BUG_ON(!pvdev);
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/* !!! only ONE open is allowed !!! */
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- if (atomic_read(&pvdev->opened))
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+ if (atomic_cmpxchg(&pvdev->opened, 0, 1))
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return -EBUSY;
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- atomic_set(&pvdev->opened, 1);
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-
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spin_lock_irqsave(&msm_pid_lock, flags);
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msm_pid = get_pid(task_pid(current));
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spin_unlock_irqrestore(&msm_pid_lock, flags);
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--
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cgit v1.1
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