1 files changed, 8 insertions, 1 deletions

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index ebbcf38fd33b..f976f303c196 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -15,6 +15,7 @@
 #include <linux/poll.h>
 #include <linux/signal.h>
 #include <linux/spinlock.h>
+#include <linux/smp_lock.h>
 #include <linux/dlm.h>
 #include <linux/dlm_device.h>
 
@@ -618,13 +619,17 @@ static int device_open(struct inode *inode, struct file *file)
         struct dlm_user_proc *proc;
         struct dlm_ls *ls;
 
+        lock_kernel();
         ls = dlm_find_lockspace_device(iminor(inode));
-        if (!ls)
+        if (!ls) {
+                unlock_kernel();
                 return -ENOENT;
+        }
 
         proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL);
         if (!proc) {
                 dlm_put_lockspace(ls);
+                unlock_kernel();
                 return -ENOMEM;
         }
 
@@ -636,6 +641,7 @@ static int device_open(struct inode *inode, struct file *file)
         spin_lock_init(&proc->locks_spin);
         init_waitqueue_head(&proc->wait);
         file->private_data = proc;
+        unlock_kernel();
 
         return 0;
 }
@@ -870,6 +876,7 @@ static unsigned int device_poll(struct file *file, poll_table *wait)
 
 static int ctl_device_open(struct inode *inode, struct file *file)
 {
+        cycle_kernel_lock();
         file->private_data = NULL;
         return 0;
 }