linux-kernel - [PATCH 12/30] staging: sync: Reorder sync_fence

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Message-Id: <1362098606-26469-13-git-send-email-john.stultz@linaro.org>
Date:	Thu, 28 Feb 2013 16:43:08 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Erik Gilling <konkers@...roid.com>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robclark@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	dri-devel@...ts.freedesktop.org,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 12/30] staging: sync: Reorder sync_fence_release

From: Erik Gilling <konkers@...roid.com>

Previously fence's pts were freed before the were the fence was removed from the
global fence list.  This led to a race with the debugfs support where it would
iterate over sync_pts that had been freed.

Cc: Maarten Lankhorst <maarten.lankhorst@...onical.com>
Cc: Erik Gilling <konkers@...roid.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Rob Clark <robclark@...il.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: dri-devel@...ts.freedesktop.org
Cc: Android Kernel Team <kernel-team@...roid.com>
Signed-off-by: Erik Gilling <konkers@...roid.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/staging/android/sync.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 6739a84..2afbd69 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -520,12 +520,12 @@ static int sync_fence_release(struct inode *inode, struct file *file)
 	struct sync_fence *fence = file->private_data;
 	unsigned long flags;
 
-	sync_fence_free_pts(fence);
-
 	spin_lock_irqsave(&sync_fence_list_lock, flags);
 	list_del(&fence->sync_fence_list);
 	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
 
+	sync_fence_free_pts(fence);
+
 	kfree(fence);
 
 	return 0;
-- 
1.7.10.4

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