From a237f3bbaab28bb780201f15f6003cf3d2e81024 Mon Sep 17 00:00:00 2001
From: Jonathan Corbet <corbet@lwn.net>
Date: Fri, 16 May 2008 14:15:33 -0600
Subject: CAPI: BKL pushdown

Put explicit lock_kernel() calls into capi_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---
 drivers/isdn/capi/capi.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

(limited to 'drivers/isdn')

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 6ca0bb949ad3..2095153582f1 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -20,6 +20,7 @@
 #include <linux/signal.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 #include <linux/timer.h>
 #include <linux/wait.h>
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -983,13 +984,17 @@ capi_ioctl(struct inode *inode, struct file *file,
 static int
 capi_open(struct inode *inode, struct file *file)
 {
+	int ret;
+	
+	lock_kernel();
 	if (file->private_data)
-		return -EEXIST;
-
-	if ((file->private_data = capidev_alloc()) == NULL)
-		return -ENOMEM;
-
-	return nonseekable_open(inode, file);
+		ret = -EEXIST;
+	else if ((file->private_data = capidev_alloc()) == NULL)
+		ret = -ENOMEM;
+	else
+		ret = nonseekable_open(inode, file);
+	unlock_kernel();
+	return ret;
 }
 
 static int
-- 
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