From patchwork Thu Dec 18 08:43:01 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Devesh Sharma X-Patchwork-Id: 5511981 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 788609F8B4 for ; Thu, 18 Dec 2014 09:29:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 91ECC209C7 for ; Thu, 18 Dec 2014 09:29:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8BE7E20A1B for ; Thu, 18 Dec 2014 09:29:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752034AbaLRJ24 (ORCPT ); Thu, 18 Dec 2014 04:28:56 -0500 Received: from cmexedge2.emulex.com ([138.239.224.100]:48938 "EHLO CMEXEDGE2.ext.emulex.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752009AbaLRJ2y (ORCPT ); Thu, 18 Dec 2014 04:28:54 -0500 Received: from CMEXHTCAS1.ad.emulex.com (138.239.115.217) by CMEXEDGE2.ext.emulex.com (138.239.224.100) with Microsoft SMTP Server (TLS) id 14.3.174.1; Thu, 18 Dec 2014 01:28:51 -0800 Received: from neo01-el64.lab.bg.emulex.com (10.192.204.8) by smtp.emulex.com (138.239.115.207) with Microsoft SMTP Server id 14.3.174.1; Thu, 18 Dec 2014 01:28:46 -0800 From: Devesh Sharma To: CC: Mitesh Ahuja , Selvin Xavier , Devesh Sharma Subject: [PATCH 07/14] RDMA/ocrdma: Host crash on destroying device resources. Date: Thu, 18 Dec 2014 14:13:01 +0530 X-Mailer: git-send-email 1.7.1 In-Reply-To: <1418892188-6623-1-git-send-email-devesh.sharma@emulex.com> References: <1418892188-6623-1-git-send-email-devesh.sharma@emulex.com> MIME-Version: 1.0 Message-ID: Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Mitesh Ahuja 1. Cleanup sequence in ocrdma_remove(). The device should be unregistered from IB stack before any device specific cleanup. 2. Always return success in the resource destroy path. In case destroy command returns error, IB stack will trigger cleanup again while closing the uverbs device causing kernel panic BUG_ON(). Signed-off-by: Selvin Xavier Signed-off-by: Mitesh Ahuja Signed-off-by: Devesh Sharma --- drivers/infiniband/hw/ocrdma/ocrdma_main.c | 4 ++-- drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 21 ++++++++------------- 2 files changed, 10 insertions(+), 15 deletions(-) diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_main.c b/drivers/infiniband/hw/ocrdma/ocrdma_main.c index edd81da..0083360 100644 --- a/drivers/infiniband/hw/ocrdma/ocrdma_main.c +++ b/drivers/infiniband/hw/ocrdma/ocrdma_main.c @@ -530,11 +530,11 @@ static void ocrdma_remove(struct ocrdma_dev *dev) /* first unregister with stack to stop all the active traffic * of the registered clients. */ - ocrdma_rem_port_stats(dev); ocrdma_remove_sysfiles(dev); - ib_unregister_device(&dev->ibdev); + ocrdma_rem_port_stats(dev); + spin_lock(&ocrdma_devlist_lock); list_del_rcu(&dev->entry); spin_unlock(&ocrdma_devlist_lock); diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c index dc18085..44a5ce1 100644 --- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c @@ -435,7 +435,6 @@ err: static int ocrdma_dealloc_ucontext_pd(struct ocrdma_ucontext *uctx) { - int status = 0; struct ocrdma_pd *pd = uctx->cntxt_pd; struct ocrdma_dev *dev = get_ocrdma_dev(pd->ibpd.device); @@ -444,8 +443,8 @@ static int ocrdma_dealloc_ucontext_pd(struct ocrdma_ucontext *uctx) __func__, dev->id, pd->id); } uctx->cntxt_pd = NULL; - status = _ocrdma_dealloc_pd(dev, pd); - return status; + (void)_ocrdma_dealloc_pd(dev, pd); + return 0; } static struct ocrdma_pd *ocrdma_get_ucontext_pd(struct ocrdma_ucontext *uctx) @@ -947,9 +946,8 @@ int ocrdma_dereg_mr(struct ib_mr *ib_mr) { struct ocrdma_mr *mr = get_ocrdma_mr(ib_mr); struct ocrdma_dev *dev = get_ocrdma_dev(ib_mr->device); - int status; - status = ocrdma_mbx_dealloc_lkey(dev, mr->hwmr.fr_mr, mr->hwmr.lkey); + (void) ocrdma_mbx_dealloc_lkey(dev, mr->hwmr.fr_mr, mr->hwmr.lkey); ocrdma_free_mr_pbl_tbl(dev, &mr->hwmr); @@ -960,11 +958,10 @@ int ocrdma_dereg_mr(struct ib_mr *ib_mr) /* Don't stop cleanup, in case FW is unresponsive */ if (dev->mqe_ctx.fw_error_state) { - status = 0; pr_err("%s(%d) fw not responding.\n", __func__, dev->id); } - return status; + return 0; } static int ocrdma_copy_cq_uresp(struct ocrdma_dev *dev, struct ocrdma_cq *cq, @@ -1096,7 +1093,6 @@ static void ocrdma_flush_cq(struct ocrdma_cq *cq) int ocrdma_destroy_cq(struct ib_cq *ibcq) { - int status; struct ocrdma_cq *cq = get_ocrdma_cq(ibcq); struct ocrdma_eq *eq = NULL; struct ocrdma_dev *dev = get_ocrdma_dev(ibcq->device); @@ -1113,7 +1109,7 @@ int ocrdma_destroy_cq(struct ib_cq *ibcq) synchronize_irq(irq); ocrdma_flush_cq(cq); - status = ocrdma_mbx_destroy_cq(dev, cq); + (void)ocrdma_mbx_destroy_cq(dev, cq); if (cq->ucontext) { pdid = cq->ucontext->cntxt_pd->id; ocrdma_del_mmap(cq->ucontext, (u64) cq->pa, @@ -1124,7 +1120,7 @@ int ocrdma_destroy_cq(struct ib_cq *ibcq) } kfree(cq); - return status; + return 0; } static int ocrdma_add_qpn_map(struct ocrdma_dev *dev, struct ocrdma_qp *qp) @@ -1725,7 +1721,6 @@ void ocrdma_del_flush_qp(struct ocrdma_qp *qp) int ocrdma_destroy_qp(struct ib_qp *ibqp) { - int status; struct ocrdma_pd *pd; struct ocrdma_qp *qp; struct ocrdma_dev *dev; @@ -1747,7 +1742,7 @@ int ocrdma_destroy_qp(struct ib_qp *ibqp) * discarded until the old CQEs are discarded. */ mutex_lock(&dev->dev_lock); - status = ocrdma_mbx_destroy_qp(dev, qp); + (void) ocrdma_mbx_destroy_qp(dev, qp); /* * acquire CQ lock while destroy is in progress, in order to @@ -1782,7 +1777,7 @@ int ocrdma_destroy_qp(struct ib_qp *ibqp) kfree(qp->wqe_wr_id_tbl); kfree(qp->rqe_wr_id_tbl); kfree(qp); - return status; + return 0; } static int ocrdma_copy_srq_uresp(struct ocrdma_dev *dev, struct ocrdma_srq *srq,