rpc_pipefs: allow rpc_purge_list to take a NULL waitq pointer

In the event that we don't have a dentry for a rpc_pipefs pipe, we still
need to allow the queue_timeout job to clean out the queue. There's just
no waitq to wake up in that event.

Cc: stable@kernel.org
Reported-by: Hans de Bruin <jmdebruin@xmsnet.nl>
Reported-by: Joerg Platte <jplatte@naasa.net>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 0404047..21fde99 100644 (file)
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -71,7 +71,9 @@ static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
                msg->errno = err;
                destroy_msg(msg);
        } while (!list_empty(head));
-       wake_up(waitq);
+
+       if (waitq)
+               wake_up(waitq);
 }
 
 static void
@@ -91,11 +93,9 @@ rpc_timeout_upcall_queue(struct work_struct *work)
        }
        dentry = dget(pipe->dentry);
        spin_unlock(&pipe->lock);
-       if (dentry) {
-               rpc_purge_list(&RPC_I(dentry->d_inode)->waitq,
-                              &free_list, destroy_msg, -ETIMEDOUT);
-               dput(dentry);
-       }
+       rpc_purge_list(dentry ? &RPC_I(dentry->d_inode)->waitq : NULL,
+                       &free_list, destroy_msg, -ETIMEDOUT);
+       dput(dentry);
 }
 
 ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,