[PATCH v2] SUNRPC: Fix call completion races with call_decode()

[trondmy@kernel.org]

From: Trond Myklebust <trond.myklebust@hammerspace.com>

We need to make sure that the req->rq_private_buf is completely up to
date before we make req->rq_reply_bytes_recvd visible to the
call_decode() routine in order to avoid triggering the WARN_ON().

Reported-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: 72691a269f0b ("SUNRPC: Don't reuse bvec on retransmission of the request")
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 net/sunrpc/xprt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index d71eec494826..f8fae7815649 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1179,11 +1179,8 @@ xprt_request_dequeue_receive_locked(struct rpc_task *task)
 {
 	struct rpc_rqst *req = task->tk_rqstp;
 
-	if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) {
+	if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate))
 		xprt_request_rb_remove(req->rq_xprt, req);
-		xdr_free_bvec(&req->rq_rcv_buf);
-		req->rq_private_buf.bvec = NULL;
-	}
 }
 
 /**
@@ -1221,6 +1218,8 @@ void xprt_complete_rqst(struct rpc_task *task, int copied)
 
 	xprt->stat.recvs++;
 
+	xdr_free_bvec(&req->rq_rcv_buf);
+	req->rq_private_buf.bvec = NULL;
 	req->rq_private_buf.len = copied;
 	/* Ensure all writes are done before we update */
 	/* req->rq_reply_bytes_recvd */
@@ -1453,6 +1452,7 @@ xprt_request_dequeue_xprt(struct rpc_task *task)
 		xprt_request_dequeue_transmit_locked(task);
 		xprt_request_dequeue_receive_locked(task);
 		spin_unlock(&xprt->queue_lock);
+		xdr_free_bvec(&req->rq_rcv_buf);
 	}
 }
 
-- 
2.37.2