From patchwork Tue Jul 31 06:21:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 10550127 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 67184139A for ; Tue, 31 Jul 2018 06:21:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 55EE729EC7 for ; Tue, 31 Jul 2018 06:21:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4A3AA29EE4; Tue, 31 Jul 2018 06:21:38 +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=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1056029EC7 for ; Tue, 31 Jul 2018 06:21:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6A5FA6E298; Tue, 31 Jul 2018 06:21:34 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 96CBB6E289 for ; Tue, 31 Jul 2018 06:21:32 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 2EC9AAFC9; Tue, 31 Jul 2018 06:21:31 +0000 (UTC) From: Thomas Zimmermann To: airlied@linux.ie, kraxel@redhat.com, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org Subject: [PATCH 2/2] drm/virtio: Replace ttm_bo_unref with ttm_bo_put Date: Tue, 31 Jul 2018 08:21:27 +0200 Message-Id: <20180731062127.10131-3-tzimmermann@suse.de> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180731062127.10131-1-tzimmermann@suse.de> References: <20180731062127.10131-1-tzimmermann@suse.de> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Zimmermann MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP The function ttm_bo_put releases a reference to a TTM buffer object. The function's name is more aligned to the Linux kernel convention of naming ref-counting function _get and _put. A call to ttm_bo_unref takes the address of the TTM BO object's pointer and clears the pointer's value to NULL. This is not necessary in most cases and sometimes even worked around by the calling code. A call to ttm_bo_put only releases the reference without clearing the pointer. The current behaviour of cleaning the pointer is kept in the calling code, but should be removed if not required in a later patch. Signed-off-by: Thomas Zimmermann --- drivers/gpu/drm/virtio/virtgpu_drv.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h index 59182975ce16..61767f9589f4 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.h +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h @@ -383,9 +383,8 @@ static inline void virtio_gpu_object_unref(struct virtio_gpu_object **bo) if ((*bo) == NULL) return; tbo = &((*bo)->tbo); - ttm_bo_unref(&tbo); - if (tbo == NULL) - *bo = NULL; + ttm_bo_put(tbo); + *bo = NULL; } static inline u64 virtio_gpu_object_mmap_offset(struct virtio_gpu_object *bo)