diff --git a/fs/udf/file.c b/fs/udf/file.c
index 7464305..b80cbd7 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -193,9 +193,11 @@
 static int udf_release_file(struct inode *inode, struct file *filp)
 {
 	if (filp->f_mode & FMODE_WRITE) {
+		mutex_lock(&inode->i_mutex);
 		lock_kernel();
 		udf_discard_prealloc(inode);
 		unlock_kernel();
+		mutex_unlock(&inode->i_mutex);
 	}
 	return 0;
 }