From 6f7f7caab259026234277b659485d22c1dcb1ab4 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 14 Jan 2011 13:26:18 -0800
Subject: [PATCH] Turn d_set_d_op() BUG_ON() into WARN_ON_ONCE()

It's indicative of a real problem, and it actually triggers with
autofs4, but the BUG_ON() is excessive.  The autofs4 case is being fixed
(to only set d_op in the ->lookup method) but not merged yet.  In the
meantime this gets the code limping along.

Reported-by: Alex Elder <aelder@sgi.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/dcache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index 0c6d5c549d84..274a22250380 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1357,8 +1357,8 @@ EXPORT_SYMBOL(d_alloc_name);
 
 void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op)
 {
-	BUG_ON(dentry->d_op);
-	BUG_ON(dentry->d_flags & (DCACHE_OP_HASH	|
+	WARN_ON_ONCE(dentry->d_op);
+	WARN_ON_ONCE(dentry->d_flags & (DCACHE_OP_HASH	|
 				DCACHE_OP_COMPARE	|
 				DCACHE_OP_REVALIDATE	|
 				DCACHE_OP_DELETE ));
-- 
2.30.2