From 66fd87d858d7b02bc5b80fbd201d21d45002d87a Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 20 May 2008 19:15:41 +0200
Subject: [PATCH] --- yaml --- r: 100335 b: refs/heads/master c:
 556889a4ae89d5f2adf98cac58ecf9326b0d0297 h: refs/heads/master i:   100333:
 41d7680406351fe3b70a0227087ae52844521cec   100331:
 f799810e20691e5f12c398a45111c59aa5179675   100327:
 83120384189fbfbd1a3db6e84f2d712b784746ba   100319:
 ecf9cbe98585052773bc97d09db1d7f30ab5f516 v: v3

---
 [refs]                          | 2 +-
 trunk/drivers/char/briq_panel.c | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 573f2942e862..f4d876faea2f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8324af6dddac11f9f7e9df8b784f6949ddb61b5d
+refs/heads/master: 556889a4ae89d5f2adf98cac58ecf9326b0d0297
diff --git a/trunk/drivers/char/briq_panel.c b/trunk/drivers/char/briq_panel.c
index b6f2639f903d..d8cff909001c 100644
--- a/trunk/drivers/char/briq_panel.c
+++ b/trunk/drivers/char/briq_panel.c
@@ -6,6 +6,7 @@
 
 #include <linux/module.h>
 
+#include <linux/smp_lock.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/tty.h>
@@ -67,11 +68,15 @@ static void set_led(char state)
 
 static int briq_panel_open(struct inode *ino, struct file *filep)
 {
-	/* enforce single access */
-	if (vfd_is_open)
+	lock_kernel();
+	/* enforce single access, vfd_is_open is protected by BKL */
+	if (vfd_is_open) {
+		unlock_kernel();
 		return -EBUSY;
+	}
 	vfd_is_open = 1;
 
+	unlock_kernel();
 	return 0;
 }