From 3610af20989023cdafb980236626b6698b28c5f4 Mon Sep 17 00:00:00 2001
From: Paul Parsons <lost.distance@yahoo.com>
Date: Wed, 7 Mar 2012 14:12:50 +0000
Subject: [PATCH] --- yaml --- r: 298158 b: refs/heads/master c:
 5fbabf3f45a15c2b39170980cee01368138f4d79 h: refs/heads/master v: v3

---
 [refs]                          |  2 +-
 trunk/drivers/mtd/maps/l440gx.c | 14 +++++++++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/[refs] b/[refs]
index 3aef63c7ba11..1274d1c077e7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 876fe76d793d03077eb61ba3afab4a383f46c554
+refs/heads/master: 5fbabf3f45a15c2b39170980cee01368138f4d79
diff --git a/trunk/drivers/mtd/maps/l440gx.c b/trunk/drivers/mtd/maps/l440gx.c
index dd0360ba2412..74bd98ee635f 100644
--- a/trunk/drivers/mtd/maps/l440gx.c
+++ b/trunk/drivers/mtd/maps/l440gx.c
@@ -27,17 +27,21 @@ static struct mtd_info *mymtd;
 
 
 /* Is this really the vpp port? */
+static DEFINE_SPINLOCK(l440gx_vpp_lock);
+static int l440gx_vpp_refcnt;
 static void l440gx_set_vpp(struct map_info *map, int vpp)
 {
-	unsigned long l;
+	unsigned long flags;
 
-	l = inl(VPP_PORT);
+	spin_lock_irqsave(&l440gx_vpp_lock, flags);
 	if (vpp) {
-		l |= 1;
+		if (++l440gx_vpp_refcnt == 1)   /* first nested 'on' */
+			outl(inl(VPP_PORT) | 1, VPP_PORT);
 	} else {
-		l &= ~1;
+		if (--l440gx_vpp_refcnt == 0)   /* last nested 'off' */
+			outl(inl(VPP_PORT) & ~1, VPP_PORT);
 	}
-	outl(l, VPP_PORT);
+	spin_unlock_irqrestore(&l440gx_vpp_lock, flags);
 }
 
 static struct map_info l440gx_map = {