From patchwork Sun Apr 2 16:48:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13197470 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 7F738C77B6E for ; Sun, 2 Apr 2023 16:49:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231213AbjDBQta (ORCPT ); Sun, 2 Apr 2023 12:49:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231254AbjDBQt0 (ORCPT ); Sun, 2 Apr 2023 12:49:26 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A37EEC5F; Sun, 2 Apr 2023 09:49:23 -0700 (PDT) Received: from workpc.. (109-252-124-32.nat.spd-mgts.ru [109.252.124.32]) (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 C97F16603149; Sun, 2 Apr 2023 17:49:19 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1680454162; bh=eVCdRV5qU8vynb/wrbVZGCbVBKV3Y+cRuke8yPhNiSw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hP3BTt5MkgWeSKeeRJnyPJdkJiCW4vh+CO/RD3NLk4Z71S6FposyyUQvkf+9iAEvm ViYtSop9tvAbEeer3NCbYe/ksUYBAaDKPI3yk3PY0jdHSlWullovFmAkAfywGn72+0 2OtqCX755RxvHKTzm25LdjO5bt5nv8+gWe29xcH+PpxoxeOnqihfOjDkPwGXBE5BXL 1lqsBdysM0KsO7CnNJwE2ewR/DFm45y2iNyqIP0Cb8x8BRonPuUZ5zplmcGUhKu5v1 y05NU/gTqSAzoeyRYtqoewGziWoxECJQKdv7R6MP1tZ7uftHxjroX9+JHenoswzVCr 7I8ScLsqJwgbw== From: Dmitry Osipenko To: Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Benjamin Gaignard , Liam Mark , Brian Starkey , John Stultz , Gerd Hoffmann , Daniel Vetter , Jani Nikula , Arnd Bergmann , Greg Kroah-Hartman , Thomas Zimmermann , Tomi Valkeinen , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Srinivas Kandagatla , Amol Maheshwari Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-arm-msm@vger.kernel.org, kernel@collabora.com Subject: [PATCH v1 4/7] Revert "fastrpc: Assert held reservation lock for dma-buf mmapping" Date: Sun, 2 Apr 2023 19:48:23 +0300 Message-Id: <20230402164826.752842-5-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230402164826.752842-1-dmitry.osipenko@collabora.com> References: <20230402164826.752842-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Don't assert held dma-buf reservation lock on memory mapping of exported buffer. We're going to change dma-buf mmap() locking policy such that exporters will have to handle the lock. The previous locking policy caused deadlock problem for DRM drivers in a case of self-imported dma-bufs, it's solved by moving the lock down to exporters. Fixes: 265751a513ad ("fastrpc: Assert held reservation lock for dma-buf mmapping") Signed-off-by: Dmitry Osipenko --- drivers/misc/fastrpc.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index a701132638cf..7e9c9ad37fd9 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -6,7 +6,6 @@ #include #include #include -#include #include #include #include @@ -733,8 +732,6 @@ static int fastrpc_mmap(struct dma_buf *dmabuf, struct fastrpc_buf *buf = dmabuf->priv; size_t size = vma->vm_end - vma->vm_start; - dma_resv_assert_held(dmabuf->resv); - return dma_mmap_coherent(buf->dev, vma, buf->virt, FASTRPC_PHYS(buf->phys), size); }