From patchwork Thu Nov 30 17:41:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steve Wise X-Patchwork-Id: 10088033 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 813DF603B4 for ; Fri, 1 Dec 2017 21:32:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 688E42A7D6 for ; Fri, 1 Dec 2017 21:32:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 672E42A7FA; Fri, 1 Dec 2017 21:32:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.6 required=2.0 tests=BAYES_00, DATE_IN_PAST_24_48, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D32A12A858 for ; Fri, 1 Dec 2017 21:31:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751039AbdLAVbb (ORCPT ); Fri, 1 Dec 2017 16:31:31 -0500 Received: from opengridcomputing.com ([70.118.0.34]:43365 "EHLO smtp.opengridcomputing.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750921AbdLAVba (ORCPT ); Fri, 1 Dec 2017 16:31:30 -0500 Received: from smtp.ogc.us (build2.ogc.int [10.10.0.32]) by smtp.opengridcomputing.com (Postfix) with ESMTP id 3864B2B8E5; Fri, 1 Dec 2017 15:31:30 -0600 (CST) Received: by smtp.ogc.us (Postfix, from userid 503) id 1ED79E0C84; Fri, 1 Dec 2017 15:31:30 -0600 (CST) From: Steve Wise Date: Thu, 30 Nov 2017 09:41:56 -0800 Subject: [PATCH rdma-rc] iw_cxgb4: only clear the ARMED bit if a notification is needed To: jgg@ziepe.ca, dledford@redhat.com, linux-rdma@vger.kernel.org Message-Id: <20171201213130.1ED79E0C84@smtp.ogc.us> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In __flush_qp(), the CQ ARMED bit was being cleared regardless of whether any notification is actually needed. This resulted in the iser termination logic getting stuck in ib_drain_sq() because the CQ was not marked ARMED and thus the drain CQE notification wasn't triggered. This new bug was exposed when this commit was merged: commit cbb40fadd31c ("iw_cxgb4: only call the cq comp_handler when the cq is armed") Signed-off-by: Steve Wise --- drivers/infiniband/hw/cxgb4/qp.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c index 5ee7fe4..355e288 100644 --- a/drivers/infiniband/hw/cxgb4/qp.c +++ b/drivers/infiniband/hw/cxgb4/qp.c @@ -1285,21 +1285,21 @@ static void __flush_qp(struct c4iw_qp *qhp, struct c4iw_cq *rchp, spin_unlock_irqrestore(&rchp->lock, flag); if (schp == rchp) { - if (t4_clear_cq_armed(&rchp->cq) && - (rq_flushed || sq_flushed)) { + if ((rq_flushed || sq_flushed) && + t4_clear_cq_armed(&rchp->cq)) { spin_lock_irqsave(&rchp->comp_handler_lock, flag); (*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context); spin_unlock_irqrestore(&rchp->comp_handler_lock, flag); } } else { - if (t4_clear_cq_armed(&rchp->cq) && rq_flushed) { + if (rq_flushed && t4_clear_cq_armed(&rchp->cq)) { spin_lock_irqsave(&rchp->comp_handler_lock, flag); (*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context); spin_unlock_irqrestore(&rchp->comp_handler_lock, flag); } - if (t4_clear_cq_armed(&schp->cq) && sq_flushed) { + if (sq_flushed && t4_clear_cq_armed(&schp->cq)) { spin_lock_irqsave(&schp->comp_handler_lock, flag); (*schp->ibcq.comp_handler)(&schp->ibcq, schp->ibcq.cq_context);