From patchwork Wed Mar 31 19:36:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 12176137 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3076C43461 for ; Wed, 31 Mar 2021 19:37:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BDF9061029 for ; Wed, 31 Mar 2021 19:37:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236280AbhCaThA (ORCPT ); Wed, 31 Mar 2021 15:37:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:44526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236268AbhCaTga (ORCPT ); Wed, 31 Mar 2021 15:36:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 480F761029; Wed, 31 Mar 2021 19:36:30 +0000 (UTC) Subject: [PATCH v1 5/8] xprtrdma: Improve commentary around rpcrdma_reps_unmap() From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Wed, 31 Mar 2021 15:36:29 -0400 Message-ID: <161721938951.515226.17560651611000798100.stgit@manet.1015granger.net> In-Reply-To: <161721926778.515226.9805598788670386587.stgit@manet.1015granger.net> References: <161721926778.515226.9805598788670386587.stgit@manet.1015granger.net> User-Agent: StGit/0.23-29-ga622f1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/verbs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index fe250d554695..b68fc81a78fb 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1034,6 +1034,10 @@ static void rpcrdma_rep_put(struct rpcrdma_buffer *buf, llist_add(&rep->rr_node, &buf->rb_free_reps); } +/* Caller must ensure the QP is quiescent (RQ is drained) before + * invoking this function, to guarantee rb_all_reps is not + * changing. + */ static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt) { struct rpcrdma_buffer *buf = &r_xprt->rx_buf; @@ -1041,7 +1045,7 @@ static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt) list_for_each_entry(rep, &buf->rb_all_reps, rr_all) { rpcrdma_regbuf_dma_unmap(rep->rr_rdmabuf); - rep->rr_temp = true; + rep->rr_temp = true; /* Mark this rep for destruction */ } }