From patchwork Mon Mar 13 05:43:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Yanjun X-Patchwork-Id: 9619739 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 998B660523 for ; Mon, 13 Mar 2017 05:44:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 87F512843D for ; Mon, 13 Mar 2017 05:44:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7CCD228440; Mon, 13 Mar 2017 05:44:44 +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 0928628445 for ; Mon, 13 Mar 2017 05:44:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750929AbdCMFoW (ORCPT ); Mon, 13 Mar 2017 01:44:22 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:49945 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750760AbdCMFoN (ORCPT ); Mon, 13 Mar 2017 01:44:13 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v2D5iA1X013015 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 Mar 2017 05:44:10 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id v2D5i91g016376 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 13 Mar 2017 05:44:09 GMT Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by aserv0121.oracle.com (8.13.8/8.13.8) with ESMTP id v2D5i65Y008916; Mon, 13 Mar 2017 05:44:07 GMT Received: from redman.cn.oracle.com (/10.113.194.127) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sun, 12 Mar 2017 22:44:06 -0700 From: Zhu Yanjun To: santosh.shilimkar@oracle.com, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com, leon@kernel.org Subject: [PATCHv3 4/4] rds: ib: unmap the scatter/gather list when error Date: Mon, 13 Mar 2017 01:43:48 -0400 Message-Id: <1489383828-7699-5-git-send-email-yanjun.zhu@oracle.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1489383828-7699-1-git-send-email-yanjun.zhu@oracle.com> References: <1489383828-7699-1-git-send-email-yanjun.zhu@oracle.com> X-Source-IP: userv0021.oracle.com [156.151.31.71] 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 --- 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.