From patchwork Mon Jul 25 15:18:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 12928216 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C54DCCA496 for ; Mon, 25 Jul 2022 15:22:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236486AbiGYPWA (ORCPT ); Mon, 25 Jul 2022 11:22:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236310AbiGYPVo (ORCPT ); Mon, 25 Jul 2022 11:21:44 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B21CB617B; Mon, 25 Jul 2022 08:21:03 -0700 (PDT) Received: from dimapc.. (109-252-119-232.nat.spd-mgts.ru [109.252.119.232]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dmitry.osipenko) by madras.collabora.co.uk (Postfix) with ESMTPSA id 2E5EC6601B0E; Mon, 25 Jul 2022 16:21:00 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1658762462; bh=va+2N1U6jZR9UG67k72ODpvUReFCq9AoJW3EC29fAyY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hF7ZR01ny2d7o7bYE+Z5dQKruldBmtrcJcYzRtqjWpjWhPHejJuJ8SbR06SZM2aPy PtNrndiN/nQSiU3QbPd3ctnZp4AsfylceLBLgZg1oSvV4c3Zv419RY/B4awMy5ey1W JdPdffAe80sYcNuJxp42Aie3X8uYUumDehJZnxPU9KVd3D21F8VXhUQFK+8ZkB1DWc KmrEP/xKl94kuJKiRYwnCEIPYClTew820OvW7bvO7YKu8UcodMFHHx5wzl7sk4al/K i0Wxa4jPFMqEzxfcD4BoG6SAy54UxKHYee5eOgxPvwHkUvoNdjeuL8fEHON/BKLhvt 80xKjVSm5X6kA== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Daniel Almeida , Gert Wollny , Gustavo Padovan , Daniel Stone , Tomeu Vizoso , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Clark , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Alex Deucher , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , =?utf-8?q?Thomas_Hellstr?= =?utf-8?q?=C3=B6m?= Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Dmitry Osipenko , linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, kernel@collabora.com, virtualization@lists.linux-foundation.org, spice-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH v2 5/5] dma-buf: Remove internal lock Date: Mon, 25 Jul 2022 18:18:39 +0300 Message-Id: <20220725151839.31622-6-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220725151839.31622-1-dmitry.osipenko@collabora.com> References: <20220725151839.31622-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org The internal dma-buf lock isn't needed anymore because the updated locking specification claims that dma-buf reservation must be locked by importers, and thus, the internal data is already protected by the reservation lock. Remove the obsoleted internal lock. Acked-by: Tomasz Figa Signed-off-by: Dmitry Osipenko --- drivers/dma-buf/dma-buf.c | 5 ----- include/linux/dma-buf.h | 9 --------- 2 files changed, 14 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index bfdd551c7571..1d211ab400a1 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -656,7 +656,6 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) dmabuf->file = file; - mutex_init(&dmabuf->lock); INIT_LIST_HEAD(&dmabuf->attachments); mutex_lock(&db_list.lock); @@ -1508,7 +1507,6 @@ int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map) return -EINVAL; dma_resv_lock(dmabuf->resv, NULL); - mutex_lock(&dmabuf->lock); if (dmabuf->vmapping_counter) { dmabuf->vmapping_counter++; BUG_ON(iosys_map_is_null(&dmabuf->vmap_ptr)); @@ -1528,7 +1526,6 @@ int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map) *map = dmabuf->vmap_ptr; out_unlock: - mutex_unlock(&dmabuf->lock); dma_resv_unlock(dmabuf->resv); return ret; } @@ -1549,13 +1546,11 @@ void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map) BUG_ON(!iosys_map_is_equal(&dmabuf->vmap_ptr, map)); dma_resv_lock(dmabuf->resv, NULL); - mutex_lock(&dmabuf->lock); if (--dmabuf->vmapping_counter == 0) { if (dmabuf->ops->vunmap) dmabuf->ops->vunmap(dmabuf, map); iosys_map_clear(&dmabuf->vmap_ptr); } - mutex_unlock(&dmabuf->lock); dma_resv_unlock(dmabuf->resv); } EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap_unlocked, DMA_BUF); diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index e7a6a8d28862..2f9fb7f3c835 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -326,15 +326,6 @@ struct dma_buf { /** @ops: dma_buf_ops associated with this buffer object. */ const struct dma_buf_ops *ops; - /** - * @lock: - * - * Used internally to serialize list manipulation, attach/detach and - * vmap/unmap. Note that in many cases this is superseeded by - * dma_resv_lock() on @resv. - */ - struct mutex lock; - /** * @vmapping_counter: *