9p: don't bother with private lock in ->d_fsdata; dentry->d_lock will do just fine

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/9p/fid.c

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index afd4724..71bc36a 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -54,14 +54,13 @@
 		if (!dent)
 			return -ENOMEM;
 
-		spin_lock_init(&dent->lock);
 		INIT_LIST_HEAD(&dent->fidlist);
 		dentry->d_fsdata = dent;
 	}
 
-	spin_lock(&dent->lock);
+	spin_lock(&dentry->d_lock);
 	list_add(&fid->dlist, &dent->fidlist);
-	spin_unlock(&dent->lock);
+	spin_unlock(&dentry->d_lock);
 
 	return 0;
 }
@@ -85,14 +84,14 @@
 	dent = (struct v9fs_dentry *) dentry->d_fsdata;
 	ret = NULL;
 	if (dent) {
-		spin_lock(&dent->lock);
+		spin_lock(&dentry->d_lock);
 		list_for_each_entry(fid, &dent->fidlist, dlist) {
 			if (any || uid_eq(fid->uid, uid)) {
 				ret = fid;
 				break;
 			}
 		}
-		spin_unlock(&dent->lock);
+		spin_unlock(&dentry->d_lock);
 	}
 
 	return ret;