Return-Path: Received: from mail-it1-f196.google.com ([209.85.166.196]:35923 "EHLO mail-it1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725975AbeJBAzF (ORCPT ); Mon, 1 Oct 2018 20:55:05 -0400 Subject: [PATCH v1 2/4] svcrdma: Remove ->release_rqst call in bc reply handler From: Chuck Lever To: bfields@fieldses.org Cc: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Mon, 01 Oct 2018 14:16:01 -0400 Message-ID: <20181001181601.2305.43928.stgit@klimt.1015granger.net> In-Reply-To: <20181001181414.2305.94635.stgit@klimt.1015granger.net> References: <20181001181414.2305.94635.stgit@klimt.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: Similar to a change made in the client's forward channel reply handler: The xprt_release_rqst_cong() call is not necessary. Also, release xprt->recv_lock when taking xprt->transport_lock to avoid disabling and enabling BH's while holding another spin lock. Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c index a681800..642f031 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c +++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c @@ -32,7 +32,6 @@ int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, __be32 *rdma_resp, struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); struct kvec *dst, *src = &rcvbuf->head[0]; struct rpc_rqst *req; - unsigned long cwnd; u32 credits; size_t len; __be32 xid; @@ -66,6 +65,8 @@ int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, __be32 *rdma_resp, if (dst->iov_len < len) goto out_unlock; memcpy(dst->iov_base, p, len); + xprt_pin_rqst(req); + spin_unlock(&xprt->recv_lock); credits = be32_to_cpup(rdma_resp + 2); if (credits == 0) @@ -74,15 +75,13 @@ int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, __be32 *rdma_resp, credits = r_xprt->rx_buf.rb_bc_max_requests; spin_lock_bh(&xprt->transport_lock); - cwnd = xprt->cwnd; xprt->cwnd = credits << RPC_CWNDSHIFT; - if (xprt->cwnd > cwnd) - xprt_release_rqst_cong(req->rq_task); spin_unlock_bh(&xprt->transport_lock); - + spin_lock(&xprt->recv_lock); ret = 0; xprt_complete_rqst(req->rq_task, rcvbuf->len); + xprt_unpin_rqst(req); rcvbuf->len = 0; out_unlock: