From patchwork Sun Mar 12 08:07:58 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Yanjun X-Patchwork-Id: 9619259 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 DEDFE60523 for ; Sun, 12 Mar 2017 08:09:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CD63F27C2D for ; Sun, 12 Mar 2017 08:09:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BBDC32846E; Sun, 12 Mar 2017 08:09:27 +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=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY 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 38139284F3 for ; Sun, 12 Mar 2017 08:09:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755714AbdCLIJG (ORCPT ); Sun, 12 Mar 2017 04:09:06 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:25353 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933178AbdCLIIS (ORCPT ); Sun, 12 Mar 2017 04:08:18 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v2C88G0k022079 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 12 Mar 2017 08:08:17 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id v2C88DsC004149 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 12 Mar 2017 08:08:14 GMT Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id v2C88DIX006997; Sun, 12 Mar 2017 08:08:13 GMT Received: from redman.cn.oracle.com (/10.113.194.127) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sun, 12 Mar 2017 00:08:12 -0800 From: Zhu Yanjun To: santosh.shilimkar@oracle.com, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com Subject: [PATCHv2 4/4] rds: ib: unmap the scatter/gather list when error Date: Sun, 12 Mar 2017 04:07:58 -0400 Message-Id: <1489306078-3354-4-git-send-email-yanjun.zhu@oracle.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1489306078-3354-1-git-send-email-yanjun.zhu@oracle.com> References: <1489306078-3354-1-git-send-email-yanjun.zhu@oracle.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] 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 When some errors occur, the scatter/gather list mapped to DMA addresses should be handled. Cc: Joe Jin Cc: Junxiao Bi Acked-by: Santosh Shilimkar Signed-off-by: Zhu Yanjun --- Change from v1 to v2: Add the acker. net/rds/ib_fmr.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/net/rds/ib_fmr.c b/net/rds/ib_fmr.c index c936b0d..86ef907 100644 --- a/net/rds/ib_fmr.c +++ b/net/rds/ib_fmr.c @@ -112,29 +112,39 @@ static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); if (dma_addr & ~PAGE_MASK) { - if (i > 0) + if (i > 0) { + ib_dma_unmap_sg(dev, sg, nents, + DMA_BIDIRECTIONAL); return -EINVAL; - else + } else { ++page_cnt; + } } if ((dma_addr + dma_len) & ~PAGE_MASK) { - if (i < sg_dma_len - 1) + if (i < sg_dma_len - 1) { + ib_dma_unmap_sg(dev, sg, nents, + DMA_BIDIRECTIONAL); return -EINVAL; - else + } else { ++page_cnt; + } } len += dma_len; } page_cnt += len >> PAGE_SHIFT; - if (page_cnt > ibmr->pool->fmr_attr.max_pages) + if (page_cnt > ibmr->pool->fmr_attr.max_pages) { + ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL); return -EINVAL; + } dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC, rdsibdev_to_node(rds_ibdev)); - if (!dma_pages) + if (!dma_pages) { + ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL); return -ENOMEM; + } page_cnt = 0; for (i = 0; i < sg_dma_len; ++i) { @@ -147,8 +157,10 @@ static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, } ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr); - if (ret) + if (ret) { + ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL); goto out; + } /* Success - we successfully remapped the MR, so we can * safely tear down the old mapping.