Return-Path: Received: from mail-io0-f195.google.com ([209.85.223.195]:34212 "EHLO mail-io0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752377AbdHPXAQ (ORCPT ); Wed, 16 Aug 2017 19:00:16 -0400 Received: by mail-io0-f195.google.com with SMTP id m88so3127718iod.1 for ; Wed, 16 Aug 2017 16:00:16 -0700 (PDT) From: Trond Myklebust To: linux-nfs@vger.kernel.org Subject: [PATCH v3 2/5] SUNRPC: Don't hold the transport lock when receiving backchannel data Date: Wed, 16 Aug 2017 19:00:05 -0400 Message-Id: <20170816230008.20006-3-trond.myklebust@primarydata.com> In-Reply-To: <20170816230008.20006-2-trond.myklebust@primarydata.com> References: <20170816230008.20006-1-trond.myklebust@primarydata.com> <20170816230008.20006-2-trond.myklebust@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: The backchannel request has no associated task, so it is going nowhere until we call xprt_complete_bc_request(). Signed-off-by: Trond Myklebust --- net/sunrpc/backchannel_rqst.c | 4 ++-- net/sunrpc/xprtsock.c | 5 +---- 2 files changed, 3 insertions(+), 6 deletions(-) diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c index ac701c28f44f..c2c68a15b59d 100644 --- a/net/sunrpc/backchannel_rqst.c +++ b/net/sunrpc/backchannel_rqst.c @@ -171,10 +171,10 @@ int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs) /* * Add the temporary list to the backchannel preallocation list */ - spin_lock_bh(&xprt->bc_pa_lock); + spin_lock(&xprt->bc_pa_lock); list_splice(&tmp_list, &xprt->bc_pa_list); xprt_inc_alloc_count(xprt, min_reqs); - spin_unlock_bh(&xprt->bc_pa_lock); + spin_unlock(&xprt->bc_pa_lock); dprintk("RPC: setup backchannel transport done\n"); return 0; diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 04dbc7027712..a2312f14beb4 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -1389,11 +1389,9 @@ static int xs_tcp_read_callback(struct rpc_xprt *xprt, container_of(xprt, struct sock_xprt, xprt); struct rpc_rqst *req; - /* Look up and lock the request corresponding to the given XID */ - spin_lock_bh(&xprt->transport_lock); + /* Look up the request corresponding to the given XID */ req = xprt_lookup_bc_request(xprt, transport->tcp_xid); if (req == NULL) { - spin_unlock_bh(&xprt->transport_lock); printk(KERN_WARNING "Callback slot table overflowed\n"); xprt_force_disconnect(xprt); return -1; @@ -1404,7 +1402,6 @@ static int xs_tcp_read_callback(struct rpc_xprt *xprt, if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) xprt_complete_bc_request(req, transport->tcp_copied); - spin_unlock_bh(&xprt->transport_lock); return 0; } -- 2.13.5