From c4f28e54d61278203c2bb2aea0679e0a738235d2 Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jirislaby@gmail.com>
Date: Mon, 12 Feb 2007 00:55:11 -0800
Subject: [PATCH] Video: fb, add true ref_count atomicity

Some of fb drivers uses atomic_t in bad manner, since there are still some
race-prone gaps.  Use mutexes to protect open/close code sections with
ref_count testing and finally use simple uint.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Denis Oliver Kropp <dok@directfb.org>
Cc: James Simmons <jsimmons@infradead.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/video/neomagic.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'include/video')

diff --git a/include/video/neomagic.h b/include/video/neomagic.h
index 78b1f15a538..a9e118a1cd1 100644
--- a/include/video/neomagic.h
+++ b/include/video/neomagic.h
@@ -140,7 +140,8 @@ typedef volatile struct {
 
 struct neofb_par {
 	struct vgastate state;
-	atomic_t ref_count;
+	struct mutex open_lock;
+	unsigned int ref_count;
 
 	unsigned char MiscOutReg;	/* Misc */
 	unsigned char CRTC[25];		/* Crtc Controller */
-- 
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