From mboxrd@z Thu Jan 1 00:00:00 1970 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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,UNPARSEABLE_RELAY 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 CB84DC43381 for ; Fri, 15 Feb 2019 15:29:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A3712192D for ; Fri, 15 Feb 2019 15:29:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="wPzQQIA3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732882AbfBOP3D (ORCPT ); Fri, 15 Feb 2019 10:29:03 -0500 Received: from aserp2130.oracle.com ([141.146.126.79]:52834 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726773AbfBOP3D (ORCPT ); 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Fri, 15 Feb 2019 15:28:42 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x1FFSaDB020728 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 15 Feb 2019 15:28:37 GMT Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x1FFSatR011294; Fri, 15 Feb 2019 15:28:36 GMT Received: from dhcp-burlington7-2nd-B-east-10-152-55-162.usdhcp.oraclecorp.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 15 Feb 2019 15:28:36 +0000 Subject: Re: [Xen-devel][PATCH 1/2] xen/gntdev: Do not destroy context while dma-bufs are in use To: Oleksandr Andrushchenko , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, jgross@suse.com Cc: Oleksandr Andrushchenko References: <20190214142321.1138-1-andr2000@gmail.com> <143411a8-385d-2cce-9211-22ba7db25a15@oracle.com> <1c8d1612-f1b9-b080-2d11-432d811b25d1@gmail.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1c8d1612-f1b9-b080-2d11-432d811b25d1@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9168 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902150106 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/15/19 10:07 AM, Oleksandr Andrushchenko wrote: > On 2/15/19 5:03 PM, Boris Ostrovsky wrote: >> On 2/14/19 9:23 AM, Oleksandr Andrushchenko wrote: >>>     /* DMA buffer export support. */ >>> @@ -311,6 +317,7 @@ static void dmabuf_exp_release(struct kref *kref) >>>         dmabuf_exp_wait_obj_signal(gntdev_dmabuf->priv, gntdev_dmabuf); >>>       list_del(&gntdev_dmabuf->next); >>> +    fput(gntdev_dmabuf->priv->filp); >>>       kfree(gntdev_dmabuf); >>>   } >>>   @@ -423,6 +430,7 @@ static int dmabuf_exp_from_pages(struct >>> gntdev_dmabuf_export_args *args) >>>       mutex_lock(&args->dmabuf_priv->lock); >>>       list_add(&gntdev_dmabuf->next, &args->dmabuf_priv->exp_list); >>>       mutex_unlock(&args->dmabuf_priv->lock); >>> +    get_file(gntdev_dmabuf->priv->filp); >> Not fget()? > fget wants file descriptor [1] and returns struct file *, > but we already have struct file*, so I use get_file [2] > which does what I need - increments the reference counter > on the file Reviewed-by: Boris Ostrovsky