[patch 090/176] NFS: Fix an NFS client lockdep issue

[Greg KH]

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>

commit e00b8a24041f37e56b4b8415ce4eba1cbc238065 upstream.

There is no reason to be freeing the delegation cred in the rcu callback,
and doing so is resulting in a lockdep complaint that rpc_credcache_lock
is being called from both softirq and non-softirq contexts.

Reported-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/nfs/delegation.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -24,8 +24,6 @@
 
 static void nfs_do_free_delegation(struct nfs_delegation *delegation)
 {
-	if (delegation->cred)
-		put_rpccred(delegation->cred);
 	kfree(delegation);
 }
 
@@ -38,6 +36,10 @@ static void nfs_free_delegation_callback
 
 static void nfs_free_delegation(struct nfs_delegation *delegation)
 {
+	if (delegation->cred) {
+		put_rpccred(delegation->cred);
+		delegation->cred = NULL;
+	}
 	call_rcu(&delegation->rcu, nfs_free_delegation_callback);
 }
 


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