divamnt: BKL pushdown

Put explicit lock_kernel() calls into maint_open().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/drivers/isdn/hardware/eicon/divamnt.c b/drivers/isdn/hardware/eicon/divamnt.c
index c909289..1e85f74 100644 (file)
--- a/drivers/isdn/hardware/eicon/divamnt.c
+++ b/drivers/isdn/hardware/eicon/divamnt.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/poll.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 #include "platform.h"
@@ -127,14 +128,19 @@ static unsigned int maint_poll(struct file *file, poll_table * wait)
 
 static int maint_open(struct inode *ino, struct file *filep)
 {
+       int ret;
+
+       lock_kernel();
        /* only one open is allowed, so we test
           it atomically */
        if (test_and_set_bit(0, &opened))
-               return (-EBUSY);
-
-       filep->private_data = NULL;
-
-       return nonseekable_open(ino, filep);
+               ret = -EBUSY;
+       else {
+               filep->private_data = NULL;
+               ret = nonseekable_open(ino, filep);
+       }
+       unlock_kernel();
+       return ret;
 }
 
 static int maint_close(struct inode *ino, struct file *filep)